diff --git a/index.js b/index.js
index 7365adf1..6861bad3 100644
--- a/index.js
+++ b/index.js
@@ -86,6 +86,7 @@ app.on('ready', () => {
     console.log('[Cider] Application is Ready. Creating Window.')
     if (!app.isPackaged) {
         console.info('[Cider] Running in development mode.')
+        require('vue-devtools').install()
     }
     CreateWindow()
 });
diff --git a/src/main/cider-base.js b/src/main/cider-base.js
index 3576d90c..00949e80 100644
--- a/src/main/cider-base.js
+++ b/src/main/cider-base.js
@@ -194,7 +194,8 @@ const CiderBase = {
 
     EnvironmentVariables: {
         "env": {
-            platform: os.platform()
+            platform: os.platform(),
+            dev: app.isPackaged
         }
     },
 
diff --git a/src/renderer/index.js b/src/renderer/index.js
index 897ace01..344c7957 100644
--- a/src/renderer/index.js
+++ b/src/renderer/index.js
@@ -1,13 +1,5 @@
 Vue.use(VueObserveVisibility);
 
-
-Vue.component('sidebar-library-item', {
-    template: '#sidebar-library-item',
-    props: ['name', 'page', 'cd-click'],
-    methods: {}
-});
-
-
 // This is going to suck to code
 var CiderContextMenu = {
     Menu: function (event) {
@@ -109,6 +101,7 @@ class NavigationEvent {
 const app = new Vue({
     el: "#app",
     data: {
+        ipcRenderer: ipcRenderer,
         cfg: ipcRenderer.sendSync("getStore"),
         isDev: ipcRenderer.sendSync("is-dev"),
         drawertest: false,
@@ -269,6 +262,12 @@ const app = new Vue({
         },
     },
     methods: {
+        navigateBack() {
+            history.back()
+        },
+        navigateForward() {
+            history.forward()
+        },
         getHTMLStyle() {
             switch(this.cfg.visual.window_transparency) {
                 case "acrylic":
@@ -2265,6 +2264,17 @@ const app = new Vue({
     }
 })
 
+Vue.component('sidebar-library-item', {
+    template: '#sidebar-library-item',
+    props: ['name', 'page', 'cd-click'],
+    data: function () {
+        return {
+            app: app
+        }
+    },
+    methods: {}
+});
+
 // Key binds
 document.addEventListener('keydown', function (e) {
     if (e.keyCode === 70 && e.ctrlKey) {
@@ -2317,6 +2327,19 @@ document.addEventListener('musickitloaded', function () {
 //     });
 //   }
 
+const getBase64FromUrl = async (url) => {
+    const data = await fetch(url);
+    const blob = await data.blob();
+    return new Promise((resolve) => {
+        const reader = new FileReader();
+        reader.readAsDataURL(blob);
+        reader.onloadend = () => {
+            const base64data = reader.result;
+            resolve(base64data);
+        }
+    });
+}
+
 function uuidv4() {
     return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
         (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
diff --git a/src/renderer/style.less b/src/renderer/style.less
index 53e703ce..232e03a3 100644
--- a/src/renderer/style.less
+++ b/src/renderer/style.less
@@ -2810,6 +2810,17 @@ input[type="range"].web-slider.display--small::-webkit-slider-thumb {
   opacity: 0;
 }
 
+.wpfade_transform-enter-active,
+.wpfade_transform-leave-active {
+  transition: opacity .1s var(--appleEase), transform .1s var(--appleEase);
+}
+
+.wpfade_transform-enter,
+.wpfade_transform-leave-to {
+  transform: scale(0.90);
+  opacity: 0;
+}
+
 .fabfade-enter-active,
 .fabfade-leave-active {
   transition: transform .1s var(--appleEase), opacity .1s var(--appleEase);
diff --git a/src/renderer/views/components/add-to-playlist.ejs b/src/renderer/views/components/add-to-playlist.ejs
index a252f367..ae5d0a30 100644
--- a/src/renderer/views/components/add-to-playlist.ejs
+++ b/src/renderer/views/components/add-to-playlist.ejs
@@ -39,7 +39,8 @@
             return {
                 playlistSorted: [],
                 searchQuery: "",
-                focused: ""
+                focused: "",
+                app: this.$root,
             }
         },
         props: {
diff --git a/src/renderer/views/components/animatedartwork-view.ejs b/src/renderer/views/components/animatedartwork-view.ejs
index f6a33396..b6cae3cd 100644
--- a/src/renderer/views/components/animatedartwork-view.ejs
+++ b/src/renderer/views/components/animatedartwork-view.ejs
@@ -1,32 +1,32 @@
 <script type="text/x-template" id="animatedartwork-view">
-    <template v-if="video">
-        <div class="animated" v-bind:vid="app.hashCode(video).toString()">
-            <video ref="video" class="animated-artwork-video" loop id="animated-artwork"></video>
-        </div>
-    </template>
+    <div class="animated" v-bind:vid="app.hashCode(video).toString()" v-if="video">
+        <video ref="video" class="animated-artwork-video" loop id="animated-artwork"></video>
+    </div>
 </script>
 
 <script>
     Vue.component('animatedartwork-view', {
         template: '#animatedartwork-view',
+        data: function () {
+            return {
+                app: this.$root,
+                hls: null,
+            }
+        },
         props: {
             video: {
                 type: String,
                 required: true
             },
-            hls: {
-                type: Object,
-                default: ''
-            },
             priority: {
                 type: Boolean,
                 default: false
             }
         },
-        async mounted()  {
-            if(!this.priority && app.cfg.visual.animated_artwork == "limited") {
+        async mounted() {
+            if (!this.priority && app.cfg.visual.animated_artwork == "limited") {
                 return
-            }else if(app.cfg.visual.animated_artwork == "disabled") {
+            } else if (app.cfg.visual.animated_artwork == "disabled") {
                 return
             }
             if (this.video) {
@@ -60,13 +60,13 @@
                         this.hls.attachMedia(this.$refs.video);
                         this.hls.loadSource(this.video);
                         this.hls.loadLevel = parseInt(app.cfg.visual.animated_artwork_qualityLevel || 1);
-                    } 
+                    }
                 })
             }
         },
         async beforeDestroy() {
-            if(this.hls) {
-               await this.hls.destroy();
+            if (this.hls) {
+                await this.hls.destroy();
                 this.hls = null
             }
         }
diff --git a/src/renderer/views/components/lyrics-view.ejs b/src/renderer/views/components/lyrics-view.ejs
index 14d5efa7..183cd6d9 100644
--- a/src/renderer/views/components/lyrics-view.ejs
+++ b/src/renderer/views/components/lyrics-view.ejs
@@ -2,7 +2,7 @@
     <div ref="lyricsview" class="md-body lyric-body">
         <template v-if="lyrics && lyrics != [] && lyrics.length > 0">
             <template v-for="(lyric, index) in lyrics" v-if="lyric && lyric.line && lyric.line != 'lrcInstrumental'">
-                <h3 class="lyric-line" @click="if(lyric.startTime != 9999999) app.seekTo(lyric.startTime, false)"
+                <h3 class="lyric-line" @click="seekTo(lyric.startTime)"
                     v-bind:line-index="index.toString()">
                     <template v-if="richlyrics && richlyrics != [] && richlyrics.length > 0">
                         <div class="richl" >
@@ -22,7 +22,7 @@
                 </h3>
             </template>
             <template v-else>
-                <h3 class="lyric-line" @click="if(lyric.startTime != 9999999) app.seekTo(lyric.startTime, false)"
+                <h3 class="lyric-line" @click="seekTo(lyric.startTime)"
                     :start="lyric.startTime"
                     :end="lyric.endTime" v-bind:line-index="index.toString()">
                     <div class="lyricWaiting">
@@ -35,7 +35,7 @@
         </template>
         <template v-else>
             <div class="no-lyrics">
-                Loading... / Lyrics not found./ Instrumental.
+                Loading... / Lyrics not found./ Instrumental.</div>
         </template>
     </div>
 </script>
@@ -43,7 +43,13 @@
     Vue.component('lyrics-view', {
         template: '#lyrics-view',
         props: ["time", "lyrics", "richlyrics", "translation", "onindex"],
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
         watch: {
+
             time: function () {
                 if (app.lyricon && app.drawer.open && this.$refs.lyricsview) {
                     let currentLine = this.$refs.lyricsview.querySelector(`.lyric-line.active`)
@@ -109,6 +115,9 @@
            
         },
         methods: {
+            seekTo(startTime) {
+                if(startTime != 9999999) this.app.seekTo(startTime, false);
+            },
             getActiveLyric() {
              //   console.log(this.time);
                 const delayfix = 0.1
diff --git a/src/renderer/views/components/mediaitem-artwork.ejs b/src/renderer/views/components/mediaitem-artwork.ejs
index 6d2cf52b..3c2a7b38 100644
--- a/src/renderer/views/components/mediaitem-artwork.ejs
+++ b/src/renderer/views/components/mediaitem-artwork.ejs
@@ -1,22 +1,13 @@
 <script type="text/x-template" id="mediaitem-artwork">
-    <template v-if="type == 'artists'">
-        <div class="mediaitem-artwork rounded" :key="url" :style="getStyle()">
-            <img :src="app.getMediaItemArtwork(url, size, width)"
-                 decoding="async"
-                 class="mediaitem-artwork--img">
+    <div class="mediaitem-artwork" :class="{'rounded': (type == 'artists')}" :key="url" :style="getStyle()"
+         v-observe-visibility="{callback: visibilityChanged}">
+        <img :src="app.getMediaItemArtwork(url, size, width)"
+             decoding="async"
+             class="mediaitem-artwork--img">
+        <div v-if="video && isVisible && getVideoPriority()" class="animatedartwork-view-box">
+            <animatedartwork-view :priority="getVideoPriority()" :video="video"></animatedartwork-view>
         </div>
-    </template>
-    <template v-else>
-        <div class="mediaitem-artwork" :key="url" :style="getStyle()"
-             v-observe-visibility="{callback: visibilityChanged}">
-            <img :src="app.getMediaItemArtwork(url, size, width)"
-                 decoding="async"
-                 class="mediaitem-artwork--img">
-            <div v-if="video && isVisible && getVideoPriority()" class="animatedartwork-view-box">
-                <animatedartwork-view :priority="getVideoPriority()" :video="video"></animatedartwork-view>   
-            </div>  
-        </div>
-    </template>
+    </div>
 </script>
 
 <script>
@@ -28,7 +19,7 @@
                 default: '120'
             },
             width: {
-                type: String,
+                type: Number,
                 required: false
             },
             url: {
@@ -54,6 +45,7 @@
         },
         data: function () {
             return {
+                app:this.$root,
                 isVisible: false,
                 style: {
                     "box-shadow": ""
diff --git a/src/renderer/views/components/mediaitem-hrect.ejs b/src/renderer/views/components/mediaitem-hrect.ejs
index f7cfd685..faaa31be 100644
--- a/src/renderer/views/components/mediaitem-hrect.ejs
+++ b/src/renderer/views/components/mediaitem-hrect.ejs
@@ -27,6 +27,11 @@
     Vue.component('mediaitem-hrect', {
         template: '#mediaitem-hrect',
         props: ['item'],
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
         methods: {}
     });
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/components/mediaitem-list-item.ejs b/src/renderer/views/components/mediaitem-list-item.ejs
index 671d4f68..f8c34409 100644
--- a/src/renderer/views/components/mediaitem-list-item.ejs
+++ b/src/renderer/views/components/mediaitem-list-item.ejs
@@ -1,67 +1,66 @@
 <script type="text/x-template" id="mediaitem-list-item">
-    <template>
-        <div v-observe-visibility="{callback: visibilityChanged}"
-             @contextmenu="contextMenu"
-             @click="select"
-             :data-id="item.attributes.playParams.id ?? item.id"
-             :data-type="getDataType()"
-             :data-index="index"
-             :data-guid="guid"
-             :data-islibrary="this.item.attributes.playParams.isLibrary ?? false"
-             class="cd-mediaitem-list-item"
-             :class="{'mediaitem-selected': app.select_hasMediaItem(guid)}">
-            <template v-if="isVisible">
-                <div class="isLibrary" v-if="showLibraryStatus == true">
-                    <button @click="addToLibrary()"
-                            v-if="!app.isInLibrary(item.attributes.playParams) && !addedToLibrary">🖤
-                    </button>
-                    <button v-else @click="removeFromLibrary()" >❤️</button>
+    <div v-observe-visibility="{callback: visibilityChanged}"
+         @contextmenu="contextMenu"
+         @click="select"
+         :data-id="item.attributes.playParams.id ?? item.id"
+         :data-type="getDataType()"
+         :data-index="index"
+         :data-guid="guid"
+         :data-islibrary="this.item.attributes.playParams.isLibrary ?? false"
+         class="cd-mediaitem-list-item"
+         :class="{'mediaitem-selected': app.select_hasMediaItem(guid)}">
+        <template v-if="isVisible">
+            <div class="isLibrary" v-if="showLibraryStatus == true">
+                <button @click="addToLibrary()"
+                        v-if="!app.isInLibrary(item.attributes.playParams) && !addedToLibrary">🖤
+                </button>
+                <button v-else @click="removeFromLibrary()">❤️</button>
+            </div>
+            <div class="artwork" v-if="showArtwork == true">
+                <mediaitem-artwork
+                        :url="item.attributes.artwork ? item.attributes.artwork.url : ''"
+                        size="50"
+                        :type="item.type"></mediaitem-artwork>
+                <button class="overlay-play" @click="playTrack()"><%- include("../svg/play.svg") %></button>
+            </div>
+            <div class="info-rect" :style="{'padding-left': (showArtwork ? '' : '16px')}"
+                 @dblclick="app.routeView(item)">
+                <div class="title text-overflow-elipsis">
+                    {{ item.attributes.name }}
                 </div>
-                <div class="artwork" v-if="showArtwork == true">
-                    <mediaitem-artwork
-                            :url="item.attributes.artwork ? item.attributes.artwork.url : ''"
-                            size="50"
-                            :type="item.type"></mediaitem-artwork>
-                    <button class="overlay-play" @click="playTrack()"><%- include("../svg/play.svg") %></button>
-                </div>
-                <div class="info-rect" :style="{'padding-left': (showArtwork ? '' : '16px')}" @dblclick="app.routeView(item)">
-                    <div class="title text-overflow-elipsis">
-                        {{ item.attributes.name }}
-                    </div>
-                    <div class="subtitle text-overflow-elipsis" style="-webkit-box-orient: horizontal;">
-                        <template v-if="item.attributes.artistName">
+                <div class="subtitle text-overflow-elipsis" style="-webkit-box-orient: horizontal;">
+                    <template v-if="item.attributes.artistName">
+                        <div class="artist item-navigate text-overflow-elipsis"
+                             @click="app.searchAndNavigate(item,'artist')">
+                            {{ item.attributes.artistName }}
+                        </div>
+                        <template v-if="item.attributes.albumName">&nbsp;-&nbsp;</template>
+                        <template v-if="item.attributes.albumName">
                             <div class="artist item-navigate text-overflow-elipsis"
-                                 @click="app.searchAndNavigate(item,'artist')">
-                                {{ item.attributes.artistName }}
+                                 @click="app.searchAndNavigate(item,'album')">
+                                {{ item.attributes.albumName }}
                             </div>
-                            <template v-if="item.attributes.albumName">&nbsp;-&nbsp;</template>
-                            <template v-if="item.attributes.albumName">
-                                <div class="artist item-navigate text-overflow-elipsis"
-                                     @click="app.searchAndNavigate(item,'album')">
-                                    {{ item.attributes.albumName }}
-                                </div>
-                            </template>
                         </template>
-                    </div>
+                    </template>
                 </div>
-                <div class="content-rating" v-if="item.attributes.contentRating" @dblclick="app.routeView(item)">
-                    {{ item.attributes.contentRating }}
+            </div>
+            <div class="content-rating" v-if="item.attributes.contentRating" @dblclick="app.routeView(item)">
+                {{ item.attributes.contentRating }}
+            </div>
+            <template v-if="showMetaData == true" @dblclick="app.routeView(item)">
+                <div class="metainfo">
+                    {{ item.attributes.releaseDate ? new Date(item.attributes.releaseDate).toLocaleDateString()
+                    : "" }}
                 </div>
-                <template v-if="showMetaData == true" @dblclick="app.routeView(item)">
-                    <div class="metainfo">
-                        {{ item.attributes.releaseDate ? new Date(item.attributes.releaseDate).toLocaleDateString()
-                        : "" }}
-                    </div>
-                    <div class="metainfo">
-                        {{ item.attributes.genreNames[0] ?? "" }}
-                    </div>
-                </template>
-                <div class="duration" v-if="showDuration" @dblclick="app.routeView(item)">
-                    {{ msToMinSec(item.attributes.durationInMillis ?? 0) }}
+                <div class="metainfo">
+                    {{ item.attributes.genreNames[0] ?? "" }}
                 </div>
             </template>
-        </div>
-    </template>
+            <div class="duration" v-if="showDuration" @dblclick="app.routeView(item)">
+                {{ msToMinSec(item.attributes.durationInMillis ?? 0) }}
+            </div>
+        </template>
+    </div>
 </script>
 
 <script>
@@ -71,13 +70,14 @@
             return {
                 isVisible: false,
                 addedToLibrary: false,
-                guid: uuidv4()
+                guid: uuidv4(),
+                app: this.$root
             }
         },
         props: {
             'item': {type: Object, required: true},
-            'parent': {type: Object, required: false},
-            'index': {type: Object, required: false, default: -1},
+            'parent': {type: String, required: false},
+            'index': {type: Number, required: false, default: -1},
             'show-artwork': {type: Boolean, default: true},
             'show-library-status': {type: Boolean, default: true},
             'show-meta-data': {type: Boolean, default: false},
@@ -85,10 +85,15 @@
             'contextExt': {type: Object, required: false},
         },
         methods: {
+            msToMinSec(ms) {
+                var minutes = Math.floor(ms / 60000);
+                var seconds = ((ms % 60000) / 1000).toFixed(0);
+                return minutes + ":" + (seconds < 10 ? '0' : '') + seconds;
+            },
             getDataType() {
-                if(this.item.attributes.playParams.isLibrary) {
+                if (this.item.attributes.playParams.isLibrary) {
                     return this.item.type
-                }else{
+                } else {
                     return this.item.attributes.playParams.kind
                 }
             },
@@ -100,7 +105,7 @@
                 if (e.shiftKey) {
                     if (this.index != -1) {
 
-                        if(app.selectedMediaItems.length == 0) {
+                        if (app.selectedMediaItems.length == 0) {
                             app.select_selectMediaItem(item_id, this.getDataType(), this.index, this.guid, isLibrary)
                         }
                         let allMediaItems = document.querySelectorAll(".cd-mediaitem-list-item[data-index]")
@@ -269,12 +274,12 @@
                         ]
                     }
                 }
-                if(this.contextExt) {
+                if (this.contextExt) {
                     // if this.context-ext.normal is true append all options to the 'normal' menu which is a kvp of arrays
-                    if(this.contextExt.normal) {
+                    if (this.contextExt.normal) {
                         menus.normal.items = menus.normal.items.concat(this.contextExt.normal)
                     }
-                    if(this.contextExt.multiple) {
+                    if (this.contextExt.multiple) {
                         menus.multiple.items = menus.multiple.items.concat(this.contextExt.multiple)
                     }
                 }
@@ -297,12 +302,12 @@
             },
             async removeFromLibrary() {
                 let item = this.item
-                let params = {"fields[songs]": "inLibrary","fields[albums]": "inLibrary","relate" : "library"}
+                let params = {"fields[songs]": "inLibrary", "fields[albums]": "inLibrary", "relate": "library"}
                 let id = item.id ?? item.attributes.playParams.id
-                let res = await app.mkapi(item.attributes.playParams.kind ?? item.type, item.attributes.playParams.isLibrary ?? false , item.attributes.playParams.id ?? item.id, params); 
+                let res = await app.mkapi(item.attributes.playParams.kind ?? item.type, item.attributes.playParams.isLibrary ?? false, item.attributes.playParams.id ?? item.id, params);
                 if (res && res.relationships && res.relationships.library && res.relationships.library.data && res.relationships.library.data.length > 0) {
                     id = res.relationships.library.data[0].id
-                }     
+                }
                 let kind = this.item.attributes.playParams.kind ?? this.data.item ?? '';
                 let truekind = (!kind.endsWith("s")) ? (kind + "s") : kind;
                 if (item.attributes.playParams.id) {
@@ -319,7 +324,7 @@
                 let item = this.item
                 let parent = this.parent
                 let childIndex = this.index
-                console.log(item,parent,childIndex)
+                console.log(item, parent, childIndex)
                 if (parent != null && childIndex != null) {
                     app.queueParentandplayChild(parent, childIndex, item);
                 } else {
diff --git a/src/renderer/views/components/mediaitem-mvview-sp.ejs b/src/renderer/views/components/mediaitem-mvview-sp.ejs
index 647c8d88..102163ba 100644
--- a/src/renderer/views/components/mediaitem-mvview-sp.ejs
+++ b/src/renderer/views/components/mediaitem-mvview-sp.ejs
@@ -1,63 +1,66 @@
 <script type="text/x-template" id="mediaitem-mvview-sp">
-    <template>
-        <div style="position: relative; display: inline-flex;">
-            <div @click.self='app.routeView(item)' 
-                 class="cd-mediaitem-mvview">
-                <div style="height: 70px; min-height: 70px; max-height: 70px; width: 100%; margin-left: 5px;"> 
-                    <div class="title-browse-sp bold " @click='app.routeView(item)' style = "color: darkgrey;">
-                        {{ badge ? badge.designBadge : ''}}
-                    </div>
-                    <div class="title-browse-sp " >
-                        {{ (badge != null && badge.designTag != null) ? badge.designTag :  (item.attributes.name ?? '') }}
-                    </div>
-                    <div class="title-browse-sp semibold" style = "color: darkgrey;" >
-                        {{ (item.attributes.artistName ?? (item.attributes.curatorName ?? '')) }}
-                    </div> 
+    <div style="position: relative; display: inline-flex;">
+        <div @click.self='app.routeView(item)'
+             class="cd-mediaitem-mvview">
+            <div style="height: 70px; min-height: 70px; max-height: 70px; width: 100%; margin-left: 5px;">
+                <div class="title-browse-sp bold " @click='app.routeView(item)' style="color: darkgrey;">
+                    {{ badge ? badge.designBadge : ''}}
                 </div>
-                <div class="artwork">
-                    <mediaitem-artwork
-                            :url="item.attributes.artwork ? item.attributes.artwork.url : ''"
-                            :video="(item.attributes != null && item.attributes.editorialVideo != null) ? (item.attributes.editorialVideo.motionDetailSquare ? item.attributes.editorialVideo.motionDetailSquare.video : (item.attributes.editorialVideo.motionSquareVideo1x1 ? item.attributes.editorialVideo.motionSquareVideo1x1.video : '')) : '' "
-                            :size="516" :width="900"
-                            ></mediaitem-artwork>
+                <div class="title-browse-sp ">
+                    {{ (badge != null && badge.designTag != null) ? badge.designTag : (item.attributes.name ?? '') }}
                 </div>
-                <div class="cd-mediaitem-mvview-overlay" @click.self='app.routeView(item)'>
-                    <div class="button" style="
+                <div class="title-browse-sp semibold" style="color: darkgrey;">
+                    {{ (item.attributes.artistName ?? (item.attributes.curatorName ?? '')) }}
+                </div>
+            </div>
+            <div class="artwork">
+                <mediaitem-artwork
+                        :url="item.attributes.artwork ? item.attributes.artwork.url : ''"
+                        :video="(item.attributes != null && item.attributes.editorialVideo != null) ? (item.attributes.editorialVideo.motionDetailSquare ? item.attributes.editorialVideo.motionDetailSquare.video : (item.attributes.editorialVideo.motionSquareVideo1x1 ? item.attributes.editorialVideo.motionSquareVideo1x1.video : '')) : '' "
+                        :size="516" :width="900"
+                ></mediaitem-artwork>
+            </div>
+            <div class="cd-mediaitem-mvview-overlay" @click.self='app.routeView(item)'>
+                <div class="button" style="
                     border-radius: 50%;
                     background: rgba(50,50,50,0.7);"
-                         :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'margin': '205px',
+                     :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'margin': '205px',
                         'margin-left': '260px', 'margin-bottom': '140px',
                         width: '30px',
                         height: '30px',} :
                         {margin: '35px', 'margin-left': '95px',
                         width: '120px',
                         height: '120px',}]" @click="app.playMediaItem(item)">
-                        <%- include("../svg/play.svg") %>
-                    </div>
+                    <%- include("../svg/play.svg") %>
                 </div>
             </div>
-            <div class="cd-mediaitem-mvview-overlay" @click.self='app.routeView(item)' tabindex="0">
-                <div class="button" style="
+        </div>
+        <div class="cd-mediaitem-mvview-overlay" @click.self='app.routeView(item)' tabindex="0">
+            <div class="button" style="
                 border-radius: 50%;
                 background: rgba(50,50,50,0.7);"
-                     :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'margin': '205px',
+                 :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'margin': '205px',
                     'margin-left': '260px', 'margin-bottom': '140px',
                     width: '30px',
                     height: '30px',} :
                     {margin: '35px', 'margin-left': '95px',
                     width: '120px',
                     height: '120px',}]" @click="app.playMediaItem(item)">
-                    <%- include("../svg/play.svg") %>
-                </div>
+                <%- include("../svg/play.svg") %>
             </div>
         </div>
-    </template>
+    </div>
 </script>
 
 <script>
     Vue.component('mediaitem-mvview-sp', {
         template: '#mediaitem-mvview-sp',
-        props: ['item', "imagesize","badge"],
+        props: ['item', "imagesize", "badge"],
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
         methods: {}
     });
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/components/mediaitem-mvview.ejs b/src/renderer/views/components/mediaitem-mvview.ejs
index f64368e1..3dc241e8 100644
--- a/src/renderer/views/components/mediaitem-mvview.ejs
+++ b/src/renderer/views/components/mediaitem-mvview.ejs
@@ -54,6 +54,11 @@
     Vue.component('mediaitem-mvview', {
         template: '#mediaitem-mvview',
         props: ['item', "imagesize"],
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
         methods: {}
     });
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/components/mediaitem-scroller-horizontal-large.ejs b/src/renderer/views/components/mediaitem-scroller-horizontal-large.ejs
index 849dbdb6..3707e41a 100644
--- a/src/renderer/views/components/mediaitem-scroller-horizontal-large.ejs
+++ b/src/renderer/views/components/mediaitem-scroller-horizontal-large.ejs
@@ -1,10 +1,8 @@
 <script type="text/x-template" id="mediaitem-scroller-horizontal-large">
-    <template>
-        <div class="cd-hmedia-scroller">
-            <mediaitem-square :item="item"
-                                    v-for="item in items"></mediaitem-square>
-        </div>
-    </template>
+    <div class="cd-hmedia-scroller">
+        <mediaitem-square :item="item"
+                          v-for="item in items"></mediaitem-square>
+    </div>
 </script>
 
 
@@ -12,6 +10,11 @@
     Vue.component('mediaitem-scroller-horizontal-large', {
         template: '#mediaitem-scroller-horizontal-large',
         props: ['items'],
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
         methods: {}
     });
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/components/mediaitem-scroller-horizontal-mvview.ejs b/src/renderer/views/components/mediaitem-scroller-horizontal-mvview.ejs
index 19919512..a9c3a036 100644
--- a/src/renderer/views/components/mediaitem-scroller-horizontal-mvview.ejs
+++ b/src/renderer/views/components/mediaitem-scroller-horizontal-mvview.ejs
@@ -1,16 +1,18 @@
 <script type="text/x-template" id="mediaitem-scroller-horizontal-mvview">
-    <template>
-        <div class="cd-hmedia-scroller">
-            <template v-if="browsesp">
-                <mediaitem-mvview-sp :item="item ? (item.attributes.kind ? item : ((item.relationships && item.relationships.contents ) ? item.relationships.contents.data[0] : item)) : []" :imagesize="imagesize"
-                   :badge="item.attributes"                     v-for="item in items"></mediaitem-mvview-sp>
-            </template>
-            <template v-else>
-                <mediaitem-square :kind="kind" size="600" :item="item ? (item.attributes.kind ? item : ((item.relationships && item.relationships.contents ) ? item.relationships.contents.data[0] : item)) : []" :imagesize="imagesize"
-                v-for="item in items"></mediaitem-square>
-            </template>                            
-        </div>
-    </template>
+    <div class="cd-hmedia-scroller">
+        <template v-if="browsesp">
+            <mediaitem-mvview-sp
+                    :item="item ? (item.attributes.kind ? item : ((item.relationships && item.relationships.contents ) ? item.relationships.contents.data[0] : item)) : []"
+                    :imagesize="imagesize"
+                    :badge="item.attributes" v-for="item in items"></mediaitem-mvview-sp>
+        </template>
+        <template v-else>
+            <mediaitem-square :kind="kind" size="600"
+                              :item="item ? (item.attributes.kind ? item : ((item.relationships && item.relationships.contents ) ? item.relationships.contents.data[0] : item)) : []"
+                              :imagesize="imagesize"
+                              v-for="item in items"></mediaitem-square>
+        </template>
+    </div>
 </script>
 
 
@@ -23,12 +25,12 @@
                 required: true
             },
             imagesize: {
-                type: String,
-                required: true
+                type: Number,
+                required: false
             },
             browsesp: {
                 type: Boolean,
-                required: true
+                required: false
             },
             kind: {
                 type: String,
@@ -36,6 +38,11 @@
                 default: ""
             }
         },
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
         methods: {}
     });
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/components/mediaitem-scroller-horizontal-sp.ejs b/src/renderer/views/components/mediaitem-scroller-horizontal-sp.ejs
index 562c083a..d29bdc46 100644
--- a/src/renderer/views/components/mediaitem-scroller-horizontal-sp.ejs
+++ b/src/renderer/views/components/mediaitem-scroller-horizontal-sp.ejs
@@ -11,6 +11,11 @@
     Vue.component('mediaitem-scroller-horizontal-sp', {
         template: '#mediaitem-scroller-horizontal-sp',
         props: ['items'],
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
         methods: {}
     });
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/components/mediaitem-scroller-horizontal.ejs b/src/renderer/views/components/mediaitem-scroller-horizontal.ejs
index 272bf174..73838811 100644
--- a/src/renderer/views/components/mediaitem-scroller-horizontal.ejs
+++ b/src/renderer/views/components/mediaitem-scroller-horizontal.ejs
@@ -11,6 +11,11 @@
     Vue.component('mediaitem-scroller-horizontal', {
         template: '#mediaitem-scroller-horizontal',
         props: ['items'],
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
         methods: {}
     });
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/components/mediaitem-square-large.ejs b/src/renderer/views/components/mediaitem-square-large.ejs
index 4c6f8753..04b713b1 100644
--- a/src/renderer/views/components/mediaitem-square-large.ejs
+++ b/src/renderer/views/components/mediaitem-square-large.ejs
@@ -74,6 +74,11 @@
     Vue.component('mediaitem-square-large', {
         template: '#mediaitem-square-large',
         props: ['item'],
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
         methods: {
             clickContext() {
                 var evt = document.createEvent('MouseEvent');
diff --git a/src/renderer/views/components/mediaitem-square-sp.ejs b/src/renderer/views/components/mediaitem-square-sp.ejs
index 9ff92ab9..785784a6 100644
--- a/src/renderer/views/components/mediaitem-square-sp.ejs
+++ b/src/renderer/views/components/mediaitem-square-sp.ejs
@@ -1,101 +1,114 @@
 <script type="text/x-template" id="mediaitem-square-sp">
-    <template>
-        <div ref="main" style="position: relative; display: inline-flex;" @contextmenu="contextMenu">
-            <div @click.self='app.routeView(item)'
-                 class="cd-mediaitem-square-sp"  ref="main2" :style="{'--spcolor' : (item.attributes.artwork.bgColor != null) ? ('#'+item.attributes.artwork.bgColor) : `black`}">
-                <div class="artwork">
-                    <mediaitem-artwork
-                            :url="item.attributes.artwork ? item.attributes.artwork.url : ''"
-                            size="300"
-                            :video="(item.attributes != null && item.attributes.editorialVideo != null) ? (item.attributes.editorialVideo.motionDetailSquare ? item.attributes.editorialVideo.motionDetailSquare.video : (item.attributes.editorialVideo.motionSquareVideo1x1 ? item.attributes.editorialVideo.motionSquareVideo1x1.video : '')) : '' "
-                            :type="item.type"></mediaitem-artwork>
-                </div>
-                <div class="cd-mediaitem-square-large-overlay" @click.self='app.routeView(item)'>
-                    <div class="button" style="
+    <div ref="main" style="position: relative; display: inline-flex;" @contextmenu="contextMenu">
+        <div @click.self='app.routeView(item)'
+             class="cd-mediaitem-square-sp" ref="main2"
+             :style="{'--spcolor' : (item.attributes.artwork.bgColor != null) ? ('#'+item.attributes.artwork.bgColor) : `black`}">
+            <div class="artwork">
+                <mediaitem-artwork
+                        :url="item.attributes.artwork ? item.attributes.artwork.url : ''"
+                        size="300"
+                        :video="(item.attributes != null && item.attributes.editorialVideo != null) ? (item.attributes.editorialVideo.motionDetailSquare ? item.attributes.editorialVideo.motionDetailSquare.video : (item.attributes.editorialVideo.motionSquareVideo1x1 ? item.attributes.editorialVideo.motionSquareVideo1x1.video : '')) : '' "
+                        :type="item.type"></mediaitem-artwork>
+            </div>
+            <div class="cd-mediaitem-square-large-overlay" @click.self='app.routeView(item)'>
+                <div class="button" style="
                     border-radius: 50%;
                     background: rgba(50,50,50,0.7);"
-                         :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'margin': '153px','position': 'absolute','margin-left': '153px',
+                     :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'margin': '153px','position': 'absolute','margin-left': '153px',
                         width: '30px',
                         height: '30px',} :
                         {margin: '35px',display:'none',
                         width: '120px',
-                        height: '120px',}]" @click="clickContext()" >
-                        <%- include("../svg/more.svg") %>
-                    </div>
-                    <div class="button" style="
+                        height: '120px',}]" @click="clickContext()">
+                    <%- include("../svg/more.svg") %>
+                </div>
+                <div class="button" style="
                     border-radius: 50%;
                     background: rgba(50,50,50,0.7);"
-                         :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'position': 'absolute','margin': '153px',
+                     :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'position': 'absolute','margin': '153px',
                         width: '30px', 'margin-left': '8px',
                         height: '30px',} :
                         {margin: '35px','position': 'absolute',
                         width: '120px',
                         height: '120px',}]" @click="app.playMediaItem(item)">
-                        <%- include("../svg/play.svg") %>
-                    </div>
+                    <%- include("../svg/play.svg") %>
                 </div>
-                <div class="title text-overflow-elipsis"
-                     :style="{'color' : (item.attributes.artwork.textColor1 != null) ? ('#'+item.attributes.artwork.textColor1) : `#eee`}" style="font-weight: 600">
-                    {{ item.attributes.name }}
-                </div>
-                <div class="subtitle text-overflow-elipsis "
-                     :class="{'item-navigate': ((item.attributes.editorialNotes == null) && item.attributes.artistName)}"
-                     :style="{ 'z-index': ((item.attributes.editorialNotes == null) && item.attributes.artistName) ? '4' : '' ,'color' : (item.attributes.artwork.textColor1 != null) ? ('#'+item.attributes.artwork.textColor1) : `#eee`}" style="padding-left: 4px;padding-right: 4px; display: -webkit-box;-webkit-box-orient: vertical; -webkit-line-clamp: 2;white-space: normal;"
-                     @click="if((item.attributes.editorialNotes == null) && item.attributes.artistName)app.searchAndNavigate(item,'artist')"
-                     >
-                    {{ (item.attributes.editorialNotes != null) ? item.attributes.editorialNotes.short
-                    :(item.attributes.artistName ?? '') }}
-                </div>
-
             </div>
-            <div class="cd-mediaitem-square-large-overlay" @click.self='app.routeView(item)' tabindex="0">
-                <div class="button" style="
+            <div class="title text-overflow-elipsis"
+                 :style="{'color' : (item.attributes.artwork.textColor1 != null) ? ('#'+item.attributes.artwork.textColor1) : `#eee`}"
+                 style="font-weight: 600">
+                {{ item.attributes.name }}
+            </div>
+            <div class="subtitle text-overflow-elipsis "
+                 :class="{'item-navigate': ((item.attributes.editorialNotes == null) && item.attributes.artistName)}"
+                 :style="{ 'z-index': ((item.attributes.editorialNotes == null) && item.attributes.artistName) ? '4' : '' ,'color' : (item.attributes.artwork.textColor1 != null) ? ('#'+item.attributes.artwork.textColor1) : `#eee`}"
+                 style="padding-left: 4px;padding-right: 4px; display: -webkit-box;-webkit-box-orient: vertical; -webkit-line-clamp: 2;white-space: normal;"
+                 @click="subtitleSearchNavigate(item)"
+            >
+                {{ (item.attributes.editorialNotes != null) ? item.attributes.editorialNotes.short
+                :(item.attributes.artistName ?? '') }}
+            </div>
+
+        </div>
+        <div class="cd-mediaitem-square-large-overlay" @click.self='app.routeView(item)' tabindex="0">
+            <div class="button" style="
                border-radius: 50%;
                background: rgba(50,50,50,0.7);"
-                     :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'margin': '153px','position': 'absolute','margin-left': '153px',
+                 :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'margin': '153px','position': 'absolute','margin-left': '153px',
                    width: '30px',
                    height: '30px',} :
                    {margin: '35px','position': 'absolute', display: 'none',
                    width: '120px',
                    height: '120px',}]" @click="clickContext()">
-                    <%- include("../svg/more.svg") %>
-                </div>
-                <div class="button" style="
+                <%- include("../svg/more.svg") %>
+            </div>
+            <div class="button" style="
                 border-radius: 50%;
                 background: rgba(50,50,50,0.7);"
-                     :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'position': 'absolute','margin': '153px',
+                 :style="[(!(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('radioStation') && !(item.attributes.playParams ? (item.attributes.playParams.kind ?? (item.type ?? '')): (item.type ?? '')).includes('song')) ? {'position': 'absolute','margin': '153px',
                     width: '30px', 'margin-left': '8px',
                     height: '30px',} :
                     {margin: '35px','position': 'absolute',
                     width: '120px',
-                    height: '120px',}]" @click="app.playMediaItem(item)" >
-                    <%- include("../svg/play.svg") %>
-                </div>
+                    height: '120px',}]" @click="app.playMediaItem(item)">
+                <%- include("../svg/play.svg") %>
             </div>
-
         </div>
-    </template>
+    </div>
 </script>
 
 <script>
     Vue.component('mediaitem-square-sp', {
         template: '#mediaitem-square-sp',
         props: ['item'],
-        methods: { clickContext() {
-                var evt =  document.createEvent('MouseEvent');
+        data: function () {
+            return {
+                app: this.$root,
+            }
+        },
+        methods: {
+            subtitleSearchNavigate(item) {
+                if((item.attributes.editorialNotes == null) && item.attributes.artistName)app.searchAndNavigate(item,'artist')
+            },
+            clickContext() {
+                var evt = document.createEvent('MouseEvent');
                 var rect = this.$refs.main2.getBoundingClientRect();
                 evt.initMouseEvent(
                     "contextmenu",
                     true /* bubble */, true /* cancelable */,
                     window, null,
-                    0, 0, rect.x + 100, rect.y +100,  /* coordinates */
+                    0, 0, rect.x + 100, rect.y + 100,  /* coordinates */
                     false, false, false, false, /* modifier keys */
                     0 /*left*/, null
                 );
                 this.$refs.main.dispatchEvent(evt);
-             }
-            ,contextMenu(event) {
-                if (!event){event = this.$refs.main} else {console.log(event)}
+            }
+            , contextMenu(event) {
+                if (!event) {
+                    event = this.$refs.main
+                } else {
+                    console.log(event)
+                }
                 let self = this
                 let useMenu = "normal"
                 if (app.selectedMediaItems.length <= 1) {
@@ -152,7 +165,7 @@
                     },
                     normal: {
                         items: [
-                            
+
                             {
                                 "name": "Play Next",
                                 "action": function () {
@@ -169,11 +182,12 @@
                                     app.selectedMediaItems = []
                                 }
                             },
-                            
+
                         ]
                     }
                 }
                 CiderContextMenu.Create(event, menus[useMenu])
-            },}
+            },
+        }
     });
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/components/mediaitem-square.ejs b/src/renderer/views/components/mediaitem-square.ejs
index 0d37567c..5ab1995d 100644
--- a/src/renderer/views/components/mediaitem-square.ejs
+++ b/src/renderer/views/components/mediaitem-square.ejs
@@ -1,30 +1,32 @@
 <script type="text/x-template" id="mediaitem-square">
-    <template>
-        <div tabindex="0"
-             class="cd-mediaitem-square" :class="getClasses()" @contextmenu="contextMenu" v-observe-visibility="{callback: visibilityChanged}">
-            <template v-if="isVisible">
-                    <div class="artwork-container">
-                        <div class="artwork" @click='app.routeView(item)'>
-                            <mediaitem-artwork
-                                    :url="getArtworkUrl()"
-                                    :video="(item.attributes != null && item.attributes.editorialVideo != null) ? (item.attributes.editorialVideo.motionDetailSquare ? item.attributes.editorialVideo.motionDetailSquare.video : (item.attributes.editorialVideo.motionSquareVideo1x1 ? item.attributes.editorialVideo.motionSquareVideo1x1.video : '')) : '' "
-                                    :size="size"
-                                    shadow="subtle"
-                                    :type="item.type"></mediaitem-artwork>
-                        </div>
-                        <button class="menu-btn" v-if="!nomenu.includes(item.type)" @click="contextMenu"><%- include("../svg/more.svg") %></button>
-                        <button class="play-btn" v-if="!noplay.includes(item.type)" @click="app.playMediaItem(item)"><%- include("../svg/play.svg") %></button>
-                    </div>
-                    <div class="title item-navigate text-overflow-elipsis" @click.self='app.routeView(item)'>
-                        {{ item.attributes.name }}
-                    </div>
-                    <div class="subtitle item-navigate text-overflow-elipsis" @click="app.searchAndNavigate(item,'artist')" v-if="item.attributes.artistName">
-                        {{ item.attributes.artistName }}
-                    </div>
-                    <div class="subtitle" v-else>&nbsp;</div>
-            </template>
-        </div>
-    </template>
+    <div tabindex="0"
+         class="cd-mediaitem-square" :class="getClasses()" @contextmenu="contextMenu"
+         v-observe-visibility="{callback: visibilityChanged}">
+        <template v-if="isVisible">
+            <div class="artwork-container">
+                <div class="artwork" @click='app.routeView(item)'>
+                    <mediaitem-artwork
+                            :url="getArtworkUrl()"
+                            :video="(item.attributes != null && item.attributes.editorialVideo != null) ? (item.attributes.editorialVideo.motionDetailSquare ? item.attributes.editorialVideo.motionDetailSquare.video : (item.attributes.editorialVideo.motionSquareVideo1x1 ? item.attributes.editorialVideo.motionSquareVideo1x1.video : '')) : '' "
+                            :size="size"
+                            shadow="subtle"
+                            :type="item.type"></mediaitem-artwork>
+                </div>
+                <button class="menu-btn" v-if="!nomenu.includes(item.type)"
+                        @click="contextMenu"><%- include("../svg/more.svg") %></button>
+                <button class="play-btn" v-if="!noplay.includes(item.type)"
+                        @click="app.playMediaItem(item)"><%- include("../svg/play.svg") %></button>
+            </div>
+            <div class="title item-navigate text-overflow-elipsis" @click.self='app.routeView(item)'>
+                {{ item.attributes.name }}
+            </div>
+            <div class="subtitle item-navigate text-overflow-elipsis" @click="app.searchAndNavigate(item,'artist')"
+                 v-if="item.attributes.artistName">
+                {{ item.attributes.artistName }}
+            </div>
+            <div class="subtitle" v-else>&nbsp;</div>
+        </template>
+    </div>
 </script>
 
 <script>
@@ -50,7 +52,8 @@
                 addedToLibrary: false,
                 guid: uuidv4(),
                 noplay: ["apple-curators"],
-                nomenu: ["artists", "stations", "apple-curators"]
+                nomenu: ["artists", "stations", "apple-curators"],
+                app: this.$root
             }
         },
         methods: {
@@ -86,10 +89,14 @@
                 this.isVisible = isVisible
             },
             contextMenu(event) {
-                if(this.nomenu.includes(this.item.type)) {
+                if (this.nomenu.includes(this.item.type)) {
                     return
                 }
-                if (!event) { event = this.$refs.main } else { console.log(event) }
+                if (!event) {
+                    event = this.$refs.main
+                } else {
+                    console.log(event)
+                }
                 let self = this
                 let useMenu = "normal"
                 if (app.selectedMediaItems.length <= 1) {
@@ -115,7 +122,7 @@
                                     for (let kind in itemsToPlay) {
                                         let ids = itemsToPlay[kind]
                                         if (ids.length > 0) {
-                                            app.mk.playNext({ [kind + "s"]: itemsToPlay[kind] })
+                                            app.mk.playNext({[kind + "s"]: itemsToPlay[kind]})
                                         }
                                     }
                                     console.log(itemsToPlay)
@@ -136,7 +143,7 @@
                                     for (let kind in itemsToPlay) {
                                         let ids = itemsToPlay[kind]
                                         if (ids.length > 0) {
-                                            app.mk.playLater({ [kind + "s"]: itemsToPlay[kind] })
+                                            app.mk.playLater({[kind + "s"]: itemsToPlay[kind]})
                                         }
                                     }
                                     app.selectedMediaItems = []
@@ -149,7 +156,7 @@
                             {
                                 "name": "Play Next",
                                 "action": function () {
-                                    app.mk.playNext({ [self.item.attributes.playParams.kind ?? self.item.type]: self.item.attributes.playParams.id ?? self.item.id })
+                                    app.mk.playNext({[self.item.attributes.playParams.kind ?? self.item.type]: self.item.attributes.playParams.id ?? self.item.id})
                                     app.mk.queue._reindex()
                                     app.selectedMediaItems = []
                                 }
@@ -157,7 +164,7 @@
                             {
                                 "name": "Play Later",
                                 "action": function () {
-                                    app.mk.playLater({ [self.item.attributes.playParams.kind ?? self.item.type]: self.item.attributes.playParams.id ?? self.item.id })
+                                    app.mk.playLater({[self.item.attributes.playParams.kind ?? self.item.type]: self.item.attributes.playParams.id ?? self.item.id})
                                     app.mk.queue._reindex()
                                     app.selectedMediaItems = []
                                 }
diff --git a/src/renderer/views/components/queue.ejs b/src/renderer/views/components/queue.ejs
index 5d5f6287..bf883cf2 100644
--- a/src/renderer/views/components/queue.ejs
+++ b/src/renderer/views/components/queue.ejs
@@ -48,7 +48,8 @@
                 queuePosition: 0,
                 queueItems: [],
                 selected: -1,
-                selectedItems: []
+                selectedItems: [],
+                app: this.$root
             }
         },
         mounted() {
diff --git a/src/renderer/views/main.ejs b/src/renderer/views/main.ejs
index 334a198e..d8d9345a 100644
--- a/src/renderer/views/main.ejs
+++ b/src/renderer/views/main.ejs
@@ -17,7 +17,7 @@
     <title>Cider</title>
     <link rel="stylesheet/less" type="text/css" href="style.less"/>
     <script src="less.js"></script>
-    <script src="vue.js"></script>
+    <script src="<%- (env.dev ? "vue.js" : "vue.dev.js") %>"></script>
     <script src="sortable.min.js"></script>
     <script src="vue-observe-visibility.min.js"></script>
     <script src="sortable.min.js"></script>
@@ -71,10 +71,10 @@
                                     {{ mk.nowPlayingItem["attributes"]["name"] }}
                                 </div>
                                 <div class="song-artist " style="display: inline-block; -webkit-box-orient: horizontal; white-space: nowrap;">
-                                    <div class="item-navigate song-artist"  style="display: inline-block;" @click="app.getNowPlayingItemDetailed(`artist`)">
+                                    <div class="item-navigate song-artist"  style="display: inline-block;" @click="getNowPlayingItemDetailed(`artist`)">
                                     {{ mk.nowPlayingItem["attributes"]["artistName"] }} 
                                     </div>
-                                    <div class="song-artist item-navigate" style="display: inline-block;" @click="app.getNowPlayingItemDetailed('album')">
+                                    <div class="song-artist item-navigate" style="display: inline-block;" @click="getNowPlayingItemDetailed('album')">
                                         {{  (mk.nowPlayingItem["attributes"]["albumName"]) ? (" - " + mk.nowPlayingItem["attributes"]["albumName"]) : "" }}
                                     </div>
                                 </div>
@@ -177,7 +177,7 @@
                             @contextmenu="playlistContextMenu($event, item.id)"
                             @dragover="()=>{}"
                             :href="item.href"
-                            @click='appRoute(`playlist_` + item.id); showingPlaylist = [];getPlaylistFromID(app.page.substring(9))'>
+                            @click='appRoute(`playlist_` + item.id); showingPlaylist = [];getPlaylistFromID(page.substring(9))'>
                         {{ item.attributes.name }}
                     </button>
                 </div>
@@ -261,8 +261,8 @@
             </div>
             <div id="app-content">
                 <div id="navigation-bar">
-                    <button class="nav-item" @click="history.back()"><%- include('svg/chevron-left.svg') %></button>
-                    <button class="nav-item" @click="history.forward()"><%- include('svg/chevron-right.svg') %></button>
+                    <button class="nav-item" @click="navigateBack()"><%- include('svg/chevron-left.svg') %></button>
+                    <button class="nav-item" @click="navigateForward()"><%- include('svg/chevron-right.svg') %></button>
                 </div>
                 <!-- Artist Page -->
                 <transition name="wpfade">
@@ -304,7 +304,7 @@
                     </template>
                 </transition>
                 <!-- Browse -->
-                <transition v-on:enter="app.getBrowsePage(); console.log('browse')" name="wpfade">
+                <transition v-on:enter="getBrowsePage(); console.log('browse')" name="wpfade">
                     <template v-if="page == 'browse'">
                         <!-- <div class="content-inner">
 
@@ -426,14 +426,14 @@
         >
     </transition>
     <transition name="wpfade">
-        <div class="bg-artwork--placeholder" v-else></div>
+        <div class="bg-artwork--placeholder"></div>
     </transition>
     <transition name="modal">
         <add-to-playlist :playlists="playlists.listing" v-if="modals.addToPlaylist"></add-to-playlist>
     </transition>
     <div id="apple-music-video-container">
         <div id="apple-music-video-player-controls">
-            <div id="player-exit" title="Close" onclick="app.exitMV()">
+            <div id="player-exit" title="Close" onclick="exitMV()">
                 <svg fill="white" xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 21 21"
                      aria-role="presentation" focusable="false">
                     <path
@@ -458,7 +458,6 @@
     </div>
 </div>
 
-
 <!-- Media Item Artwork-->
 <%- include("components/mediaitem-artwork"); %>
 <!-- Browse -->
@@ -495,7 +494,7 @@
 <!-- Sidebar Item -->
 <script type="text/x-template" id="sidebar-library-item">
     <button class="app-sidebar-item"
-            :class="$parent.getSidebarItemClass(page)" @click="app.appRoute(page)">
+            :class="$parent.getSidebarItemClass(page)" @click="$root.appRoute(page)">
         {{ name }}
     </button>
 </script>
@@ -531,7 +530,6 @@
 <!-- Lyrics View -->
 <%- include('components/lyrics-view') %>
 
-<script src="musickit.js?v=1"></script>
 <script>
     if (typeof MusicKit == 'undefined') {
         document.write(unescape("%3Cscript src='https://js-cdn.music.apple.com/musickit/v2/amp/musickit.js' type='text/javascript'%3E%3C/script%3E"));
diff --git a/src/renderer/views/pages/artist.ejs b/src/renderer/views/pages/artist.ejs
index ac794971..05519a95 100644
--- a/src/renderer/views/pages/artist.ejs
+++ b/src/renderer/views/pages/artist.ejs
@@ -128,7 +128,8 @@
         props: ['data'],
         data: function () {
             return {
-                topSongsExpanded: false
+                topSongsExpanded: false,
+                app: this.$root
             }
         },
         methods: {
diff --git a/src/renderer/views/pages/browse.ejs b/src/renderer/views/pages/browse.ejs
index b8ebbd93..f86de422 100644
--- a/src/renderer/views/pages/browse.ejs
+++ b/src/renderer/views/pages/browse.ejs
@@ -36,6 +36,11 @@
 <script>
     Vue.component('cider-browse', {
         template: "#cider-browse",
-        props: ["data"]
+        props: ["data"],
+        data: function () {
+            return {
+                app: this.$root
+            }
+        },
     })    
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/pages/cider-playlist.ejs b/src/renderer/views/pages/cider-playlist.ejs
index 64e955bc..07c28728 100644
--- a/src/renderer/views/pages/cider-playlist.ejs
+++ b/src/renderer/views/pages/cider-playlist.ejs
@@ -1,10 +1,10 @@
 <script type="text/x-template" id="cider-playlist">
-    <template>
-        <div class="content-inner playlist-page" v-if="data != [] && data.attributes != null" :style="{'--bgColor': (data.attributes.artwork != null && data.attributes.artwork['bgColor'] != null) ? ('#' + data.attributes.artwork.bgColor) : ''}">
-            <template v-if="app.playlists.loadingState == 0">
-                <div class="content-inner centered">Loading...</div>
-            </template>
-            <template v-if="app.playlists.loadingState == 1">
+    <div class="content-inner playlist-page" v-if="data != [] && data.attributes != null"
+         :style="{'--bgColor': (data.attributes.artwork != null && data.attributes.artwork['bgColor'] != null) ? ('#' + data.attributes.artwork.bgColor) : ''}">
+        <template v-if="app.playlists.loadingState == 0">
+            <div class="content-inner centered">Loading...</div>
+        </template>
+        <template v-if="app.playlists.loadingState == 1">
             <div class="playlist-display row"
                  :style="{
                 background: (data.attributes.artwork != null && data.attributes.artwork['bgColor'] != null) ? ('#' + data.attributes.artwork.bgColor) : '',
@@ -23,11 +23,19 @@
                 <div class="col playlist-info">
                     <template v-if="!editorialNotesExpanded">
                         <div>
-                            <div class="playlist-name" @click="editPlaylistName()" v-show="!nameEditing">{{data.attributes ? (data.attributes.name ??
+                            <div class="playlist-name" @click="editPlaylistName()" v-show="!nameEditing">
+                                {{data.attributes ? (data.attributes.name ??
                                 (data.attributes.title ?? '') ?? '') : ''}}
                             </div>
-                            <div class="playlist-name" v-show="nameEditing"><input type="text" spellcheck="false" class="nameEdit" v-model="data.attributes.name" @blur="editPlaylist" @change="editPlaylist" @keydown.enter="editPlaylist"/></div>
-                            <div class="playlist-artist item-navigate" v-if="data.attributes && data.attributes.artistName" @click="if(data.attributes && data.attributes.artistName){ app.searchAndNavigate(data,'artist')}">
+                            <div class="playlist-name" v-show="nameEditing"><input type="text" spellcheck="false"
+                                                                                   class="nameEdit"
+                                                                                   v-model="data.attributes.name"
+                                                                                   @blur="editPlaylist"
+                                                                                   @change="editPlaylist"
+                                                                                   @keydown.enter="editPlaylist"/></div>
+                            <div class="playlist-artist item-navigate"
+                                 v-if="data.attributes && data.attributes.artistName"
+                                 @click="if(data.attributes && data.attributes.artistName){ app.searchAndNavigate(data,'artist')}">
                                 {{data.attributes ? (data.attributes.artistName ?? '') :''}}
                             </div>
                             <div class="playlist-desc" v-if="data.attributes.editorialNotes">
@@ -57,33 +65,35 @@
                             Shuffle
                         </button>
                         <button class="wr-btn" style="min-width: 120px;" v-if="inLibrary!=null"
-                        @click="(!inLibrary) ? addToLibrary(data.attributes.playParams.id.toString()) : removeFromLibrary(data.attributes.playParams.id.toString())">
-                          {{ (!inLibrary) ? "Add to Library" : "Remove from Library" }}
-                       </button>
+                                @click="(!inLibrary) ? addToLibrary(data.attributes.playParams.id.toString()) : removeFromLibrary(data.attributes.playParams.id.toString())">
+                            {{ (!inLibrary) ? "Add to Library" : "Remove from Library" }}
+                        </button>
                     </div>
                 </div>
             </div>
             <div class="playlist-body">
                 <div class="well">
                     <div style="width:100%">
-                        <draggable :sort="data.attributes.canEdit && data.type == 'library-playlists'" v-model="data.relationships.tracks.data" @start="drag=true" @end="drag=false;put()">
-                            <mediaitem-list-item :item="item" :parent="getItemParent(data)" :index="index" :context-ext="buildContextMenu()"
+                        <draggable :sort="data.attributes.canEdit && data.type == 'library-playlists'"
+                                   v-model="data.relationships.tracks.data" @start="drag=true" @end="drag=false;put()">
+                            <mediaitem-list-item :item="item" :parent="getItemParent(data)" :index="index"
+                                                 :context-ext="buildContextMenu()"
                                                  v-for="(item,index) in data.relationships.tracks.data"></mediaitem-list-item>
                         </draggable>
                     </div>
 
                 </div>
-                <div class="playlist-time"> 
+                <div class="playlist-time">
                     {{data.attributes.releaseDate}}
                 </div>
-                <div class="playlist-time item-navigate" @click="app.searchAndNavigate(data,'recordLabel') " style="width: 50%;"> 
+                <div class="playlist-time item-navigate" @click="app.searchAndNavigate(data,'recordLabel') "
+                     style="width: 50%;">
                     {{data.attributes.copyright}}
                 </div>
                 <div class="playlist-time">{{app.getTotalTime()}}</div>
             </div>
         </template>
     </div>
-</template>
 
 </script>
 <script>
@@ -95,7 +105,8 @@
                 editorialNotesExpanded: false,
                 drag: false,
                 nameEditing: false,
-                inLibrary: null
+                inLibrary: null,
+                app: this.$root
             }
         },
         mounted: function () {
@@ -103,20 +114,22 @@
                 this.isInLibrary()
             })
         },
-        watch:{
-           data: function () {
+        watch: {
+            data: function () {
                 this.isInLibrary()
             }
         },
         methods: {
-             async isInLibrary () {
-                 if (this.data.type && !this.data.type.includes("library")){
+            async isInLibrary() {
+                if (this.data.type && !this.data.type.includes("library")) {
                     // please keep using vars here
-                 var params = {"fields[playlists]": "inLibrary","fields[albums]": "inLibrary","relate" : "library"}
-                 var res = await app.mkapi(this.data.attributes.playParams.kind ?? this.data.type, this.data.attributes.playParams.isLibrary ?? false , this.data.attributes.playParams.id ?? this.data.id, params);    
-                 this.inLibrary = (res && res.attributes && res.attributes.inLibrary) ? res.attributes.inLibrary : false
-                 console.log(res)
-                } else {this.inLibrary = true}
+                    var params = {"fields[playlists]": "inLibrary", "fields[albums]": "inLibrary", "relate": "library"}
+                    var res = await app.mkapi(this.data.attributes.playParams.kind ?? this.data.type, this.data.attributes.playParams.isLibrary ?? false, this.data.attributes.playParams.id ?? this.data.id, params);
+                    this.inLibrary = (res && res.attributes && res.attributes.inLibrary) ? res.attributes.inLibrary : false
+                    console.log(res)
+                } else {
+                    this.inLibrary = true
+                }
             },
             editPlaylist() {
                 app.editPlaylist(this.data.id, this.data.attributes.name);
@@ -126,29 +139,29 @@
                 app.mk.addToLibrary(id)
                 this.inLibrary = true
             },
-            async removeFromLibrary(id) {    
-                var params = {"fields[somgs]": "inLibrary","fields[albums]": "inLibrary","relate" : "library"}
+            async removeFromLibrary(id) {
+                var params = {"fields[somgs]": "inLibrary", "fields[albums]": "inLibrary", "relate": "library"}
                 var id = this.data.id ?? this.data.attributes.playParams.id
-                var res = await app.mkapi(this.data.attributes.playParams.kind ?? this.data.type, this.data.attributes.playParams.isLibrary ?? false , this.data.attributes.playParams.id ?? this.data.id, params); 
+                var res = await app.mkapi(this.data.attributes.playParams.kind ?? this.data.type, this.data.attributes.playParams.isLibrary ?? false, this.data.attributes.playParams.id ?? this.data.id, params);
                 if (res && res.relationships && res.relationships.library && res.relationships.library.data && res.relationships.library.data.length > 0) {
                     id = res.relationships.library.data[0].id
-                }     
+                }
                 let kind = this.data.attributes.playParams.kind ?? this.data.type ?? '';
                 var truekind = (!kind.endsWith("s")) ? (kind + "s") : kind;
-                app.mk.api.library.remove({[truekind]: id })
+                app.mk.api.library.remove({[truekind]: id})
                 this.inLibrary = false
             },
             editPlaylistName() {
-                if(this.data.attributes.canEdit && this.data.type == "library-playlists") {
+                if (this.data.attributes.canEdit && this.data.type == "library-playlists") {
                     this.nameEditing = true
                     setTimeout(() => {
                         document.querySelector(".nameEdit").focus()
                     }, 100)
                 }
             },
-            buildContextMenu (index) {
+            buildContextMenu(index) {
                 let self = this
-                if(!this.data.attributes.canEdit) {
+                if (!this.data.attributes.canEdit) {
                     return
                 }
                 return {
@@ -171,20 +184,20 @@
                 }
             },
             async put() {
-                if(!this.data.attributes.canEdit) {
+                if (!this.data.attributes.canEdit) {
                     return
                 }
                 await app.mk.api.library.putPlaylistTracklisting(this.data.attributes.playParams.id, this.convert())
             },
-            async remove () {
-                if(!this.data.attributes.canEdit) {
+            async remove() {
+                if (!this.data.attributes.canEdit) {
                     return
                 }
                 // for each app.selectedMediaItems splice the items from the playlist
-                for(let i = 0; i < app.selectedMediaItems.length; i++) {
+                for (let i = 0; i < app.selectedMediaItems.length; i++) {
                     let item = app.selectedMediaItems[i]
                     let index = this.data.relationships.tracks.data.findIndex(x => x.id == item.id)
-                    if(index > -1) {
+                    if (index > -1) {
                         this.data.relationships.tracks.data.splice(index, 1)
                     }
                 }
diff --git a/src/renderer/views/pages/search.ejs b/src/renderer/views/pages/search.ejs
index d3b6ec74..239e598c 100644
--- a/src/renderer/views/pages/search.ejs
+++ b/src/renderer/views/pages/search.ejs
@@ -51,6 +51,11 @@
     Vue.component('cider-search', {
         template: "#cider-search",
         props: ['search'],
+        data: function() {
+            return {
+                app: this.$root
+            }
+        },
         methods: {
             getTopResult() {
                 if (this.search.results["meta"]) {
diff --git a/src/renderer/views/pages/settings.ejs b/src/renderer/views/pages/settings.ejs
index c21a820f..99370471 100644
--- a/src/renderer/views/pages/settings.ejs
+++ b/src/renderer/views/pages/settings.ejs
@@ -503,6 +503,7 @@
         props: [],
         data: function () {
             return {
+                app: this.$root
             }
         },
         methods: {
diff --git a/src/renderer/vue.dev.js b/src/renderer/vue.dev.js
new file mode 100644
index 00000000..99ca0e40
--- /dev/null
+++ b/src/renderer/vue.dev.js
@@ -0,0 +1,12014 @@
+/*!
+ * Vue.js v2.6.14
+ * (c) 2014-2021 Evan You
+ * Released under the MIT License.
+ */
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+        typeof define === 'function' && define.amd ? define(factory) :
+            (global = global || self, global.Vue = factory());
+}(this, function () { 'use strict';
+
+    /*  */
+
+    var emptyObject = Object.freeze({});
+
+    // These helpers produce better VM code in JS engines due to their
+    // explicitness and function inlining.
+    function isUndef (v) {
+        return v === undefined || v === null
+    }
+
+    function isDef (v) {
+        return v !== undefined && v !== null
+    }
+
+    function isTrue (v) {
+        return v === true
+    }
+
+    function isFalse (v) {
+        return v === false
+    }
+
+    /**
+     * Check if value is primitive.
+     */
+    function isPrimitive (value) {
+        return (
+            typeof value === 'string' ||
+            typeof value === 'number' ||
+            // $flow-disable-line
+            typeof value === 'symbol' ||
+            typeof value === 'boolean'
+        )
+    }
+
+    /**
+     * Quick object check - this is primarily used to tell
+     * Objects from primitive values when we know the value
+     * is a JSON-compliant type.
+     */
+    function isObject (obj) {
+        return obj !== null && typeof obj === 'object'
+    }
+
+    /**
+     * Get the raw type string of a value, e.g., [object Object].
+     */
+    var _toString = Object.prototype.toString;
+
+    function toRawType (value) {
+        return _toString.call(value).slice(8, -1)
+    }
+
+    /**
+     * Strict object type check. Only returns true
+     * for plain JavaScript objects.
+     */
+    function isPlainObject (obj) {
+        return _toString.call(obj) === '[object Object]'
+    }
+
+    function isRegExp (v) {
+        return _toString.call(v) === '[object RegExp]'
+    }
+
+    /**
+     * Check if val is a valid array index.
+     */
+    function isValidArrayIndex (val) {
+        var n = parseFloat(String(val));
+        return n >= 0 && Math.floor(n) === n && isFinite(val)
+    }
+
+    function isPromise (val) {
+        return (
+            isDef(val) &&
+            typeof val.then === 'function' &&
+            typeof val.catch === 'function'
+        )
+    }
+
+    /**
+     * Convert a value to a string that is actually rendered.
+     */
+    function toString (val) {
+        return val == null
+            ? ''
+            : Array.isArray(val) || (isPlainObject(val) && val.toString === _toString)
+                ? JSON.stringify(val, null, 2)
+                : String(val)
+    }
+
+    /**
+     * Convert an input value to a number for persistence.
+     * If the conversion fails, return original string.
+     */
+    function toNumber (val) {
+        var n = parseFloat(val);
+        return isNaN(n) ? val : n
+    }
+
+    /**
+     * Make a map and return a function for checking if a key
+     * is in that map.
+     */
+    function makeMap (
+        str,
+        expectsLowerCase
+    ) {
+        var map = Object.create(null);
+        var list = str.split(',');
+        for (var i = 0; i < list.length; i++) {
+            map[list[i]] = true;
+        }
+        return expectsLowerCase
+            ? function (val) { return map[val.toLowerCase()]; }
+            : function (val) { return map[val]; }
+    }
+
+    /**
+     * Check if a tag is a built-in tag.
+     */
+    var isBuiltInTag = makeMap('slot,component', true);
+
+    /**
+     * Check if an attribute is a reserved attribute.
+     */
+    var isReservedAttribute = makeMap('key,ref,slot,slot-scope,is');
+
+    /**
+     * Remove an item from an array.
+     */
+    function remove (arr, item) {
+        if (arr.length) {
+            var index = arr.indexOf(item);
+            if (index > -1) {
+                return arr.splice(index, 1)
+            }
+        }
+    }
+
+    /**
+     * Check whether an object has the property.
+     */
+    var hasOwnProperty = Object.prototype.hasOwnProperty;
+    function hasOwn (obj, key) {
+        return hasOwnProperty.call(obj, key)
+    }
+
+    /**
+     * Create a cached version of a pure function.
+     */
+    function cached (fn) {
+        var cache = Object.create(null);
+        return (function cachedFn (str) {
+            var hit = cache[str];
+            return hit || (cache[str] = fn(str))
+        })
+    }
+
+    /**
+     * Camelize a hyphen-delimited string.
+     */
+    var camelizeRE = /-(\w)/g;
+    var camelize = cached(function (str) {
+        return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
+    });
+
+    /**
+     * Capitalize a string.
+     */
+    var capitalize = cached(function (str) {
+        return str.charAt(0).toUpperCase() + str.slice(1)
+    });
+
+    /**
+     * Hyphenate a camelCase string.
+     */
+    var hyphenateRE = /\B([A-Z])/g;
+    var hyphenate = cached(function (str) {
+        return str.replace(hyphenateRE, '-$1').toLowerCase()
+    });
+
+    /**
+     * Simple bind polyfill for environments that do not support it,
+     * e.g., PhantomJS 1.x. Technically, we don't need this anymore
+     * since native bind is now performant enough in most browsers.
+     * But removing it would mean breaking code that was able to run in
+     * PhantomJS 1.x, so this must be kept for backward compatibility.
+     */
+
+    /* istanbul ignore next */
+    function polyfillBind (fn, ctx) {
+        function boundFn (a) {
+            var l = arguments.length;
+            return l
+                ? l > 1
+                    ? fn.apply(ctx, arguments)
+                    : fn.call(ctx, a)
+                : fn.call(ctx)
+        }
+
+        boundFn._length = fn.length;
+        return boundFn
+    }
+
+    function nativeBind (fn, ctx) {
+        return fn.bind(ctx)
+    }
+
+    var bind = Function.prototype.bind
+        ? nativeBind
+        : polyfillBind;
+
+    /**
+     * Convert an Array-like object to a real Array.
+     */
+    function toArray (list, start) {
+        start = start || 0;
+        var i = list.length - start;
+        var ret = new Array(i);
+        while (i--) {
+            ret[i] = list[i + start];
+        }
+        return ret
+    }
+
+    /**
+     * Mix properties into target object.
+     */
+    function extend (to, _from) {
+        for (var key in _from) {
+            to[key] = _from[key];
+        }
+        return to
+    }
+
+    /**
+     * Merge an Array of Objects into a single Object.
+     */
+    function toObject (arr) {
+        var res = {};
+        for (var i = 0; i < arr.length; i++) {
+            if (arr[i]) {
+                extend(res, arr[i]);
+            }
+        }
+        return res
+    }
+
+    /* eslint-disable no-unused-vars */
+
+    /**
+     * Perform no operation.
+     * Stubbing args to make Flow happy without leaving useless transpiled code
+     * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/).
+     */
+    function noop (a, b, c) {}
+
+    /**
+     * Always return false.
+     */
+    var no = function (a, b, c) { return false; };
+
+    /* eslint-enable no-unused-vars */
+
+    /**
+     * Return the same value.
+     */
+    var identity = function (_) { return _; };
+
+    /**
+     * Generate a string containing static keys from compiler modules.
+     */
+    function genStaticKeys (modules) {
+        return modules.reduce(function (keys, m) {
+            return keys.concat(m.staticKeys || [])
+        }, []).join(',')
+    }
+
+    /**
+     * Check if two values are loosely equal - that is,
+     * if they are plain objects, do they have the same shape?
+     */
+    function looseEqual (a, b) {
+        if (a === b) { return true }
+        var isObjectA = isObject(a);
+        var isObjectB = isObject(b);
+        if (isObjectA && isObjectB) {
+            try {
+                var isArrayA = Array.isArray(a);
+                var isArrayB = Array.isArray(b);
+                if (isArrayA && isArrayB) {
+                    return a.length === b.length && a.every(function (e, i) {
+                        return looseEqual(e, b[i])
+                    })
+                } else if (a instanceof Date && b instanceof Date) {
+                    return a.getTime() === b.getTime()
+                } else if (!isArrayA && !isArrayB) {
+                    var keysA = Object.keys(a);
+                    var keysB = Object.keys(b);
+                    return keysA.length === keysB.length && keysA.every(function (key) {
+                        return looseEqual(a[key], b[key])
+                    })
+                } else {
+                    /* istanbul ignore next */
+                    return false
+                }
+            } catch (e) {
+                /* istanbul ignore next */
+                return false
+            }
+        } else if (!isObjectA && !isObjectB) {
+            return String(a) === String(b)
+        } else {
+            return false
+        }
+    }
+
+    /**
+     * Return the first index at which a loosely equal value can be
+     * found in the array (if value is a plain object, the array must
+     * contain an object of the same shape), or -1 if it is not present.
+     */
+    function looseIndexOf (arr, val) {
+        for (var i = 0; i < arr.length; i++) {
+            if (looseEqual(arr[i], val)) { return i }
+        }
+        return -1
+    }
+
+    /**
+     * Ensure a function is called only once.
+     */
+    function once (fn) {
+        var called = false;
+        return function () {
+            if (!called) {
+                called = true;
+                fn.apply(this, arguments);
+            }
+        }
+    }
+
+    var SSR_ATTR = 'data-server-rendered';
+
+    var ASSET_TYPES = [
+        'component',
+        'directive',
+        'filter'
+    ];
+
+    var LIFECYCLE_HOOKS = [
+        'beforeCreate',
+        'created',
+        'beforeMount',
+        'mounted',
+        'beforeUpdate',
+        'updated',
+        'beforeDestroy',
+        'destroyed',
+        'activated',
+        'deactivated',
+        'errorCaptured',
+        'serverPrefetch'
+    ];
+
+    /*  */
+
+
+
+    var config = ({
+        /**
+         * Option merge strategies (used in core/util/options)
+         */
+        // $flow-disable-line
+        optionMergeStrategies: Object.create(null),
+
+        /**
+         * Whether to suppress warnings.
+         */
+        silent: false,
+
+        /**
+         * Show production mode tip message on boot?
+         */
+        productionTip: "development" !== 'production',
+
+        /**
+         * Whether to enable devtools
+         */
+        devtools: "development" !== 'production',
+
+        /**
+         * Whether to record perf
+         */
+        performance: false,
+
+        /**
+         * Error handler for watcher errors
+         */
+        errorHandler: null,
+
+        /**
+         * Warn handler for watcher warns
+         */
+        warnHandler: null,
+
+        /**
+         * Ignore certain custom elements
+         */
+        ignoredElements: [],
+
+        /**
+         * Custom user key aliases for v-on
+         */
+        // $flow-disable-line
+        keyCodes: Object.create(null),
+
+        /**
+         * Check if a tag is reserved so that it cannot be registered as a
+         * component. This is platform-dependent and may be overwritten.
+         */
+        isReservedTag: no,
+
+        /**
+         * Check if an attribute is reserved so that it cannot be used as a component
+         * prop. This is platform-dependent and may be overwritten.
+         */
+        isReservedAttr: no,
+
+        /**
+         * Check if a tag is an unknown element.
+         * Platform-dependent.
+         */
+        isUnknownElement: no,
+
+        /**
+         * Get the namespace of an element
+         */
+        getTagNamespace: noop,
+
+        /**
+         * Parse the real tag name for the specific platform.
+         */
+        parsePlatformTagName: identity,
+
+        /**
+         * Check if an attribute must be bound using property, e.g. value
+         * Platform-dependent.
+         */
+        mustUseProp: no,
+
+        /**
+         * Perform updates asynchronously. Intended to be used by Vue Test Utils
+         * This will significantly reduce performance if set to false.
+         */
+        async: true,
+
+        /**
+         * Exposed for legacy reasons
+         */
+        _lifecycleHooks: LIFECYCLE_HOOKS
+    });
+
+    /*  */
+
+    /**
+     * unicode letters used for parsing html tags, component names and property paths.
+     * using https://www.w3.org/TR/html53/semantics-scripting.html#potentialcustomelementname
+     * skipping \u10000-\uEFFFF due to it freezing up PhantomJS
+     */
+    var unicodeRegExp = /a-zA-Z\u00B7\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD/;
+
+    /**
+     * Check if a string starts with $ or _
+     */
+    function isReserved (str) {
+        var c = (str + '').charCodeAt(0);
+        return c === 0x24 || c === 0x5F
+    }
+
+    /**
+     * Define a property.
+     */
+    function def (obj, key, val, enumerable) {
+        Object.defineProperty(obj, key, {
+            value: val,
+            enumerable: !!enumerable,
+            writable: true,
+            configurable: true
+        });
+    }
+
+    /**
+     * Parse simple path.
+     */
+    var bailRE = new RegExp(("[^" + (unicodeRegExp.source) + ".$_\\d]"));
+    function parsePath (path) {
+        if (bailRE.test(path)) {
+            return
+        }
+        var segments = path.split('.');
+        return function (obj) {
+            for (var i = 0; i < segments.length; i++) {
+                if (!obj) { return }
+                obj = obj[segments[i]];
+            }
+            return obj
+        }
+    }
+
+    /*  */
+
+    // can we use __proto__?
+    var hasProto = '__proto__' in {};
+
+    // Browser environment sniffing
+    var inBrowser = typeof window !== 'undefined';
+    var inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;
+    var weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();
+    var UA = inBrowser && window.navigator.userAgent.toLowerCase();
+    var isIE = UA && /msie|trident/.test(UA);
+    var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
+    var isEdge = UA && UA.indexOf('edge/') > 0;
+    var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');
+    var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
+    var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
+    var isPhantomJS = UA && /phantomjs/.test(UA);
+    var isFF = UA && UA.match(/firefox\/(\d+)/);
+
+    // Firefox has a "watch" function on Object.prototype...
+    var nativeWatch = ({}).watch;
+
+    var supportsPassive = false;
+    if (inBrowser) {
+        try {
+            var opts = {};
+            Object.defineProperty(opts, 'passive', ({
+                get: function get () {
+                    /* istanbul ignore next */
+                    supportsPassive = true;
+                }
+            })); // https://github.com/facebook/flow/issues/285
+            window.addEventListener('test-passive', null, opts);
+        } catch (e) {}
+    }
+
+    // this needs to be lazy-evaled because vue may be required before
+    // vue-server-renderer can set VUE_ENV
+    var _isServer;
+    var isServerRendering = function () {
+        if (_isServer === undefined) {
+            /* istanbul ignore if */
+            if (!inBrowser && !inWeex && typeof global !== 'undefined') {
+                // detect presence of vue-server-renderer and avoid
+                // Webpack shimming the process
+                _isServer = global['process'] && global['process'].env.VUE_ENV === 'server';
+            } else {
+                _isServer = false;
+            }
+        }
+        return _isServer
+    };
+
+    // detect devtools
+    var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;
+
+    /* istanbul ignore next */
+    function isNative (Ctor) {
+        return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
+    }
+
+    var hasSymbol =
+        typeof Symbol !== 'undefined' && isNative(Symbol) &&
+        typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);
+
+    var _Set;
+    /* istanbul ignore if */ // $flow-disable-line
+    if (typeof Set !== 'undefined' && isNative(Set)) {
+        // use native Set when available.
+        _Set = Set;
+    } else {
+        // a non-standard Set polyfill that only works with primitive keys.
+        _Set = /*@__PURE__*/(function () {
+            function Set () {
+                this.set = Object.create(null);
+            }
+            Set.prototype.has = function has (key) {
+                return this.set[key] === true
+            };
+            Set.prototype.add = function add (key) {
+                this.set[key] = true;
+            };
+            Set.prototype.clear = function clear () {
+                this.set = Object.create(null);
+            };
+
+            return Set;
+        }());
+    }
+
+    /*  */
+
+    var warn = noop;
+    var tip = noop;
+    var generateComponentTrace = (noop); // work around flow check
+    var formatComponentName = (noop);
+
+    {
+        var hasConsole = typeof console !== 'undefined';
+        var classifyRE = /(?:^|[-_])(\w)/g;
+        var classify = function (str) { return str
+            .replace(classifyRE, function (c) { return c.toUpperCase(); })
+            .replace(/[-_]/g, ''); };
+
+        warn = function (msg, vm) {
+            var trace = vm ? generateComponentTrace(vm) : '';
+
+            if (config.warnHandler) {
+                config.warnHandler.call(null, msg, vm, trace);
+            } else if (hasConsole && (!config.silent)) {
+                console.error(("[Vue warn]: " + msg + trace));
+            }
+        };
+
+        tip = function (msg, vm) {
+            if (hasConsole && (!config.silent)) {
+                console.warn("[Vue tip]: " + msg + (
+                    vm ? generateComponentTrace(vm) : ''
+                ));
+            }
+        };
+
+        formatComponentName = function (vm, includeFile) {
+            if (vm.$root === vm) {
+                return '<Root>'
+            }
+            var options = typeof vm === 'function' && vm.cid != null
+                ? vm.options
+                : vm._isVue
+                    ? vm.$options || vm.constructor.options
+                    : vm;
+            var name = options.name || options._componentTag;
+            var file = options.__file;
+            if (!name && file) {
+                var match = file.match(/([^/\\]+)\.vue$/);
+                name = match && match[1];
+            }
+
+            return (
+                (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
+                (file && includeFile !== false ? (" at " + file) : '')
+            )
+        };
+
+        var repeat = function (str, n) {
+            var res = '';
+            while (n) {
+                if (n % 2 === 1) { res += str; }
+                if (n > 1) { str += str; }
+                n >>= 1;
+            }
+            return res
+        };
+
+        generateComponentTrace = function (vm) {
+            if (vm._isVue && vm.$parent) {
+                var tree = [];
+                var currentRecursiveSequence = 0;
+                while (vm) {
+                    if (tree.length > 0) {
+                        var last = tree[tree.length - 1];
+                        if (last.constructor === vm.constructor) {
+                            currentRecursiveSequence++;
+                            vm = vm.$parent;
+                            continue
+                        } else if (currentRecursiveSequence > 0) {
+                            tree[tree.length - 1] = [last, currentRecursiveSequence];
+                            currentRecursiveSequence = 0;
+                        }
+                    }
+                    tree.push(vm);
+                    vm = vm.$parent;
+                }
+                return '\n\nfound in\n\n' + tree
+                    .map(function (vm, i) { return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)
+                        ? ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)")
+                        : formatComponentName(vm))); })
+                    .join('\n')
+            } else {
+                return ("\n\n(found in " + (formatComponentName(vm)) + ")")
+            }
+        };
+    }
+
+    /*  */
+
+    var uid = 0;
+
+    /**
+     * A dep is an observable that can have multiple
+     * directives subscribing to it.
+     */
+    var Dep = function Dep () {
+        this.id = uid++;
+        this.subs = [];
+    };
+
+    Dep.prototype.addSub = function addSub (sub) {
+        this.subs.push(sub);
+    };
+
+    Dep.prototype.removeSub = function removeSub (sub) {
+        remove(this.subs, sub);
+    };
+
+    Dep.prototype.depend = function depend () {
+        if (Dep.target) {
+            Dep.target.addDep(this);
+        }
+    };
+
+    Dep.prototype.notify = function notify () {
+        // stabilize the subscriber list first
+        var subs = this.subs.slice();
+        if (!config.async) {
+            // subs aren't sorted in scheduler if not running async
+            // we need to sort them now to make sure they fire in correct
+            // order
+            subs.sort(function (a, b) { return a.id - b.id; });
+        }
+        for (var i = 0, l = subs.length; i < l; i++) {
+            subs[i].update();
+        }
+    };
+
+    // The current target watcher being evaluated.
+    // This is globally unique because only one watcher
+    // can be evaluated at a time.
+    Dep.target = null;
+    var targetStack = [];
+
+    function pushTarget (target) {
+        targetStack.push(target);
+        Dep.target = target;
+    }
+
+    function popTarget () {
+        targetStack.pop();
+        Dep.target = targetStack[targetStack.length - 1];
+    }
+
+    /*  */
+
+    var VNode = function VNode (
+        tag,
+        data,
+        children,
+        text,
+        elm,
+        context,
+        componentOptions,
+        asyncFactory
+    ) {
+        this.tag = tag;
+        this.data = data;
+        this.children = children;
+        this.text = text;
+        this.elm = elm;
+        this.ns = undefined;
+        this.context = context;
+        this.fnContext = undefined;
+        this.fnOptions = undefined;
+        this.fnScopeId = undefined;
+        this.key = data && data.key;
+        this.componentOptions = componentOptions;
+        this.componentInstance = undefined;
+        this.parent = undefined;
+        this.raw = false;
+        this.isStatic = false;
+        this.isRootInsert = true;
+        this.isComment = false;
+        this.isCloned = false;
+        this.isOnce = false;
+        this.asyncFactory = asyncFactory;
+        this.asyncMeta = undefined;
+        this.isAsyncPlaceholder = false;
+    };
+
+    var prototypeAccessors = { child: { configurable: true } };
+
+    // DEPRECATED: alias for componentInstance for backwards compat.
+    /* istanbul ignore next */
+    prototypeAccessors.child.get = function () {
+        return this.componentInstance
+    };
+
+    Object.defineProperties( VNode.prototype, prototypeAccessors );
+
+    var createEmptyVNode = function (text) {
+        if ( text === void 0 ) text = '';
+
+        var node = new VNode();
+        node.text = text;
+        node.isComment = true;
+        return node
+    };
+
+    function createTextVNode (val) {
+        return new VNode(undefined, undefined, undefined, String(val))
+    }
+
+    // optimized shallow clone
+    // used for static nodes and slot nodes because they may be reused across
+    // multiple renders, cloning them avoids errors when DOM manipulations rely
+    // on their elm reference.
+    function cloneVNode (vnode) {
+        var cloned = new VNode(
+            vnode.tag,
+            vnode.data,
+            // #7975
+            // clone children array to avoid mutating original in case of cloning
+            // a child.
+            vnode.children && vnode.children.slice(),
+            vnode.text,
+            vnode.elm,
+            vnode.context,
+            vnode.componentOptions,
+            vnode.asyncFactory
+        );
+        cloned.ns = vnode.ns;
+        cloned.isStatic = vnode.isStatic;
+        cloned.key = vnode.key;
+        cloned.isComment = vnode.isComment;
+        cloned.fnContext = vnode.fnContext;
+        cloned.fnOptions = vnode.fnOptions;
+        cloned.fnScopeId = vnode.fnScopeId;
+        cloned.asyncMeta = vnode.asyncMeta;
+        cloned.isCloned = true;
+        return cloned
+    }
+
+    /*
+   * not type checking this file because flow doesn't play well with
+   * dynamically accessing methods on Array prototype
+   */
+
+    var arrayProto = Array.prototype;
+    var arrayMethods = Object.create(arrayProto);
+
+    var methodsToPatch = [
+        'push',
+        'pop',
+        'shift',
+        'unshift',
+        'splice',
+        'sort',
+        'reverse'
+    ];
+
+    /**
+     * Intercept mutating methods and emit events
+     */
+    methodsToPatch.forEach(function (method) {
+        // cache original method
+        var original = arrayProto[method];
+        def(arrayMethods, method, function mutator () {
+            var args = [], len = arguments.length;
+            while ( len-- ) args[ len ] = arguments[ len ];
+
+            var result = original.apply(this, args);
+            var ob = this.__ob__;
+            var inserted;
+            switch (method) {
+                case 'push':
+                case 'unshift':
+                    inserted = args;
+                    break
+                case 'splice':
+                    inserted = args.slice(2);
+                    break
+            }
+            if (inserted) { ob.observeArray(inserted); }
+            // notify change
+            ob.dep.notify();
+            return result
+        });
+    });
+
+    /*  */
+
+    var arrayKeys = Object.getOwnPropertyNames(arrayMethods);
+
+    /**
+     * In some cases we may want to disable observation inside a component's
+     * update computation.
+     */
+    var shouldObserve = true;
+
+    function toggleObserving (value) {
+        shouldObserve = value;
+    }
+
+    /**
+     * Observer class that is attached to each observed
+     * object. Once attached, the observer converts the target
+     * object's property keys into getter/setters that
+     * collect dependencies and dispatch updates.
+     */
+    var Observer = function Observer (value) {
+        this.value = value;
+        this.dep = new Dep();
+        this.vmCount = 0;
+        def(value, '__ob__', this);
+        if (Array.isArray(value)) {
+            if (hasProto) {
+                protoAugment(value, arrayMethods);
+            } else {
+                copyAugment(value, arrayMethods, arrayKeys);
+            }
+            this.observeArray(value);
+        } else {
+            this.walk(value);
+        }
+    };
+
+    /**
+     * Walk through all properties and convert them into
+     * getter/setters. This method should only be called when
+     * value type is Object.
+     */
+    Observer.prototype.walk = function walk (obj) {
+        var keys = Object.keys(obj);
+        for (var i = 0; i < keys.length; i++) {
+            defineReactive$$1(obj, keys[i]);
+        }
+    };
+
+    /**
+     * Observe a list of Array items.
+     */
+    Observer.prototype.observeArray = function observeArray (items) {
+        for (var i = 0, l = items.length; i < l; i++) {
+            observe(items[i]);
+        }
+    };
+
+    // helpers
+
+    /**
+     * Augment a target Object or Array by intercepting
+     * the prototype chain using __proto__
+     */
+    function protoAugment (target, src) {
+        /* eslint-disable no-proto */
+        target.__proto__ = src;
+        /* eslint-enable no-proto */
+    }
+
+    /**
+     * Augment a target Object or Array by defining
+     * hidden properties.
+     */
+    /* istanbul ignore next */
+    function copyAugment (target, src, keys) {
+        for (var i = 0, l = keys.length; i < l; i++) {
+            var key = keys[i];
+            def(target, key, src[key]);
+        }
+    }
+
+    /**
+     * Attempt to create an observer instance for a value,
+     * returns the new observer if successfully observed,
+     * or the existing observer if the value already has one.
+     */
+    function observe (value, asRootData) {
+        if (!isObject(value) || value instanceof VNode) {
+            return
+        }
+        var ob;
+        if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
+            ob = value.__ob__;
+        } else if (
+            shouldObserve &&
+            !isServerRendering() &&
+            (Array.isArray(value) || isPlainObject(value)) &&
+            Object.isExtensible(value) &&
+            !value._isVue
+        ) {
+            ob = new Observer(value);
+        }
+        if (asRootData && ob) {
+            ob.vmCount++;
+        }
+        return ob
+    }
+
+    /**
+     * Define a reactive property on an Object.
+     */
+    function defineReactive$$1 (
+        obj,
+        key,
+        val,
+        customSetter,
+        shallow
+    ) {
+        var dep = new Dep();
+
+        var property = Object.getOwnPropertyDescriptor(obj, key);
+        if (property && property.configurable === false) {
+            return
+        }
+
+        // cater for pre-defined getter/setters
+        var getter = property && property.get;
+        var setter = property && property.set;
+        if ((!getter || setter) && arguments.length === 2) {
+            val = obj[key];
+        }
+
+        var childOb = !shallow && observe(val);
+        Object.defineProperty(obj, key, {
+            enumerable: true,
+            configurable: true,
+            get: function reactiveGetter () {
+                var value = getter ? getter.call(obj) : val;
+                if (Dep.target) {
+                    dep.depend();
+                    if (childOb) {
+                        childOb.dep.depend();
+                        if (Array.isArray(value)) {
+                            dependArray(value);
+                        }
+                    }
+                }
+                return value
+            },
+            set: function reactiveSetter (newVal) {
+                var value = getter ? getter.call(obj) : val;
+                /* eslint-disable no-self-compare */
+                if (newVal === value || (newVal !== newVal && value !== value)) {
+                    return
+                }
+                /* eslint-enable no-self-compare */
+                if (customSetter) {
+                    customSetter();
+                }
+                // #7981: for accessor properties without setter
+                if (getter && !setter) { return }
+                if (setter) {
+                    setter.call(obj, newVal);
+                } else {
+                    val = newVal;
+                }
+                childOb = !shallow && observe(newVal);
+                dep.notify();
+            }
+        });
+    }
+
+    /**
+     * Set a property on an object. Adds the new property and
+     * triggers change notification if the property doesn't
+     * already exist.
+     */
+    function set (target, key, val) {
+        if (isUndef(target) || isPrimitive(target)
+        ) {
+            warn(("Cannot set reactive property on undefined, null, or primitive value: " + ((target))));
+        }
+        if (Array.isArray(target) && isValidArrayIndex(key)) {
+            target.length = Math.max(target.length, key);
+            target.splice(key, 1, val);
+            return val
+        }
+        if (key in target && !(key in Object.prototype)) {
+            target[key] = val;
+            return val
+        }
+        var ob = (target).__ob__;
+        if (target._isVue || (ob && ob.vmCount)) {
+            warn(
+                'Avoid adding reactive properties to a Vue instance or its root $data ' +
+                'at runtime - declare it upfront in the data option.'
+            );
+            return val
+        }
+        if (!ob) {
+            target[key] = val;
+            return val
+        }
+        defineReactive$$1(ob.value, key, val);
+        ob.dep.notify();
+        return val
+    }
+
+    /**
+     * Delete a property and trigger change if necessary.
+     */
+    function del (target, key) {
+        if (isUndef(target) || isPrimitive(target)
+        ) {
+            warn(("Cannot delete reactive property on undefined, null, or primitive value: " + ((target))));
+        }
+        if (Array.isArray(target) && isValidArrayIndex(key)) {
+            target.splice(key, 1);
+            return
+        }
+        var ob = (target).__ob__;
+        if (target._isVue || (ob && ob.vmCount)) {
+            warn(
+                'Avoid deleting properties on a Vue instance or its root $data ' +
+                '- just set it to null.'
+            );
+            return
+        }
+        if (!hasOwn(target, key)) {
+            return
+        }
+        delete target[key];
+        if (!ob) {
+            return
+        }
+        ob.dep.notify();
+    }
+
+    /**
+     * Collect dependencies on array elements when the array is touched, since
+     * we cannot intercept array element access like property getters.
+     */
+    function dependArray (value) {
+        for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
+            e = value[i];
+            e && e.__ob__ && e.__ob__.dep.depend();
+            if (Array.isArray(e)) {
+                dependArray(e);
+            }
+        }
+    }
+
+    /*  */
+
+    /**
+     * Option overwriting strategies are functions that handle
+     * how to merge a parent option value and a child option
+     * value into the final value.
+     */
+    var strats = config.optionMergeStrategies;
+
+    /**
+     * Options with restrictions
+     */
+    {
+        strats.el = strats.propsData = function (parent, child, vm, key) {
+            if (!vm) {
+                warn(
+                    "option \"" + key + "\" can only be used during instance " +
+                    'creation with the `new` keyword.'
+                );
+            }
+            return defaultStrat(parent, child)
+        };
+    }
+
+    /**
+     * Helper that recursively merges two data objects together.
+     */
+    function mergeData (to, from) {
+        if (!from) { return to }
+        var key, toVal, fromVal;
+
+        var keys = hasSymbol
+            ? Reflect.ownKeys(from)
+            : Object.keys(from);
+
+        for (var i = 0; i < keys.length; i++) {
+            key = keys[i];
+            // in case the object is already observed...
+            if (key === '__ob__') { continue }
+            toVal = to[key];
+            fromVal = from[key];
+            if (!hasOwn(to, key)) {
+                set(to, key, fromVal);
+            } else if (
+                toVal !== fromVal &&
+                isPlainObject(toVal) &&
+                isPlainObject(fromVal)
+            ) {
+                mergeData(toVal, fromVal);
+            }
+        }
+        return to
+    }
+
+    /**
+     * Data
+     */
+    function mergeDataOrFn (
+        parentVal,
+        childVal,
+        vm
+    ) {
+        if (!vm) {
+            // in a Vue.extend merge, both should be functions
+            if (!childVal) {
+                return parentVal
+            }
+            if (!parentVal) {
+                return childVal
+            }
+            // when parentVal & childVal are both present,
+            // we need to return a function that returns the
+            // merged result of both functions... no need to
+            // check if parentVal is a function here because
+            // it has to be a function to pass previous merges.
+            return function mergedDataFn () {
+                return mergeData(
+                    typeof childVal === 'function' ? childVal.call(this, this) : childVal,
+                    typeof parentVal === 'function' ? parentVal.call(this, this) : parentVal
+                )
+            }
+        } else {
+            return function mergedInstanceDataFn () {
+                // instance merge
+                var instanceData = typeof childVal === 'function'
+                    ? childVal.call(vm, vm)
+                    : childVal;
+                var defaultData = typeof parentVal === 'function'
+                    ? parentVal.call(vm, vm)
+                    : parentVal;
+                if (instanceData) {
+                    return mergeData(instanceData, defaultData)
+                } else {
+                    return defaultData
+                }
+            }
+        }
+    }
+
+    strats.data = function (
+        parentVal,
+        childVal,
+        vm
+    ) {
+        if (!vm) {
+            if (childVal && typeof childVal !== 'function') {
+                warn(
+                    'The "data" option should be a function ' +
+                    'that returns a per-instance value in component ' +
+                    'definitions.',
+                    vm
+                );
+
+                return parentVal
+            }
+            return mergeDataOrFn(parentVal, childVal)
+        }
+
+        return mergeDataOrFn(parentVal, childVal, vm)
+    };
+
+    /**
+     * Hooks and props are merged as arrays.
+     */
+    function mergeHook (
+        parentVal,
+        childVal
+    ) {
+        var res = childVal
+            ? parentVal
+                ? parentVal.concat(childVal)
+                : Array.isArray(childVal)
+                    ? childVal
+                    : [childVal]
+            : parentVal;
+        return res
+            ? dedupeHooks(res)
+            : res
+    }
+
+    function dedupeHooks (hooks) {
+        var res = [];
+        for (var i = 0; i < hooks.length; i++) {
+            if (res.indexOf(hooks[i]) === -1) {
+                res.push(hooks[i]);
+            }
+        }
+        return res
+    }
+
+    LIFECYCLE_HOOKS.forEach(function (hook) {
+        strats[hook] = mergeHook;
+    });
+
+    /**
+     * Assets
+     *
+     * When a vm is present (instance creation), we need to do
+     * a three-way merge between constructor options, instance
+     * options and parent options.
+     */
+    function mergeAssets (
+        parentVal,
+        childVal,
+        vm,
+        key
+    ) {
+        var res = Object.create(parentVal || null);
+        if (childVal) {
+            assertObjectType(key, childVal, vm);
+            return extend(res, childVal)
+        } else {
+            return res
+        }
+    }
+
+    ASSET_TYPES.forEach(function (type) {
+        strats[type + 's'] = mergeAssets;
+    });
+
+    /**
+     * Watchers.
+     *
+     * Watchers hashes should not overwrite one
+     * another, so we merge them as arrays.
+     */
+    strats.watch = function (
+        parentVal,
+        childVal,
+        vm,
+        key
+    ) {
+        // work around Firefox's Object.prototype.watch...
+        if (parentVal === nativeWatch) { parentVal = undefined; }
+        if (childVal === nativeWatch) { childVal = undefined; }
+        /* istanbul ignore if */
+        if (!childVal) { return Object.create(parentVal || null) }
+        {
+            assertObjectType(key, childVal, vm);
+        }
+        if (!parentVal) { return childVal }
+        var ret = {};
+        extend(ret, parentVal);
+        for (var key$1 in childVal) {
+            var parent = ret[key$1];
+            var child = childVal[key$1];
+            if (parent && !Array.isArray(parent)) {
+                parent = [parent];
+            }
+            ret[key$1] = parent
+                ? parent.concat(child)
+                : Array.isArray(child) ? child : [child];
+        }
+        return ret
+    };
+
+    /**
+     * Other object hashes.
+     */
+    strats.props =
+        strats.methods =
+            strats.inject =
+                strats.computed = function (
+                    parentVal,
+                    childVal,
+                    vm,
+                    key
+                ) {
+                    if (childVal && "development" !== 'production') {
+                        assertObjectType(key, childVal, vm);
+                    }
+                    if (!parentVal) { return childVal }
+                    var ret = Object.create(null);
+                    extend(ret, parentVal);
+                    if (childVal) { extend(ret, childVal); }
+                    return ret
+                };
+    strats.provide = mergeDataOrFn;
+
+    /**
+     * Default strategy.
+     */
+    var defaultStrat = function (parentVal, childVal) {
+        return childVal === undefined
+            ? parentVal
+            : childVal
+    };
+
+    /**
+     * Validate component names
+     */
+    function checkComponents (options) {
+        for (var key in options.components) {
+            validateComponentName(key);
+        }
+    }
+
+    function validateComponentName (name) {
+        if (!new RegExp(("^[a-zA-Z][\\-\\.0-9_" + (unicodeRegExp.source) + "]*$")).test(name)) {
+            warn(
+                'Invalid component name: "' + name + '". Component names ' +
+                'should conform to valid custom element name in html5 specification.'
+            );
+        }
+        if (isBuiltInTag(name) || config.isReservedTag(name)) {
+            warn(
+                'Do not use built-in or reserved HTML elements as component ' +
+                'id: ' + name
+            );
+        }
+    }
+
+    /**
+     * Ensure all props option syntax are normalized into the
+     * Object-based format.
+     */
+    function normalizeProps (options, vm) {
+        var props = options.props;
+        if (!props) { return }
+        var res = {};
+        var i, val, name;
+        if (Array.isArray(props)) {
+            i = props.length;
+            while (i--) {
+                val = props[i];
+                if (typeof val === 'string') {
+                    name = camelize(val);
+                    res[name] = { type: null };
+                } else {
+                    warn('props must be strings when using array syntax.');
+                }
+            }
+        } else if (isPlainObject(props)) {
+            for (var key in props) {
+                val = props[key];
+                name = camelize(key);
+                res[name] = isPlainObject(val)
+                    ? val
+                    : { type: val };
+            }
+        } else {
+            warn(
+                "Invalid value for option \"props\": expected an Array or an Object, " +
+                "but got " + (toRawType(props)) + ".",
+                vm
+            );
+        }
+        options.props = res;
+    }
+
+    /**
+     * Normalize all injections into Object-based format
+     */
+    function normalizeInject (options, vm) {
+        var inject = options.inject;
+        if (!inject) { return }
+        var normalized = options.inject = {};
+        if (Array.isArray(inject)) {
+            for (var i = 0; i < inject.length; i++) {
+                normalized[inject[i]] = { from: inject[i] };
+            }
+        } else if (isPlainObject(inject)) {
+            for (var key in inject) {
+                var val = inject[key];
+                normalized[key] = isPlainObject(val)
+                    ? extend({ from: key }, val)
+                    : { from: val };
+            }
+        } else {
+            warn(
+                "Invalid value for option \"inject\": expected an Array or an Object, " +
+                "but got " + (toRawType(inject)) + ".",
+                vm
+            );
+        }
+    }
+
+    /**
+     * Normalize raw function directives into object format.
+     */
+    function normalizeDirectives (options) {
+        var dirs = options.directives;
+        if (dirs) {
+            for (var key in dirs) {
+                var def$$1 = dirs[key];
+                if (typeof def$$1 === 'function') {
+                    dirs[key] = { bind: def$$1, update: def$$1 };
+                }
+            }
+        }
+    }
+
+    function assertObjectType (name, value, vm) {
+        if (!isPlainObject(value)) {
+            warn(
+                "Invalid value for option \"" + name + "\": expected an Object, " +
+                "but got " + (toRawType(value)) + ".",
+                vm
+            );
+        }
+    }
+
+    /**
+     * Merge two option objects into a new one.
+     * Core utility used in both instantiation and inheritance.
+     */
+    function mergeOptions (
+        parent,
+        child,
+        vm
+    ) {
+        {
+            checkComponents(child);
+        }
+
+        if (typeof child === 'function') {
+            child = child.options;
+        }
+
+        normalizeProps(child, vm);
+        normalizeInject(child, vm);
+        normalizeDirectives(child);
+
+        // Apply extends and mixins on the child options,
+        // but only if it is a raw options object that isn't
+        // the result of another mergeOptions call.
+        // Only merged options has the _base property.
+        if (!child._base) {
+            if (child.extends) {
+                parent = mergeOptions(parent, child.extends, vm);
+            }
+            if (child.mixins) {
+                for (var i = 0, l = child.mixins.length; i < l; i++) {
+                    parent = mergeOptions(parent, child.mixins[i], vm);
+                }
+            }
+        }
+
+        var options = {};
+        var key;
+        for (key in parent) {
+            mergeField(key);
+        }
+        for (key in child) {
+            if (!hasOwn(parent, key)) {
+                mergeField(key);
+            }
+        }
+        function mergeField (key) {
+            var strat = strats[key] || defaultStrat;
+            options[key] = strat(parent[key], child[key], vm, key);
+        }
+        return options
+    }
+
+    /**
+     * Resolve an asset.
+     * This function is used because child instances need access
+     * to assets defined in its ancestor chain.
+     */
+    function resolveAsset (
+        options,
+        type,
+        id,
+        warnMissing
+    ) {
+        /* istanbul ignore if */
+        if (typeof id !== 'string') {
+            return
+        }
+        var assets = options[type];
+        // check local registration variations first
+        if (hasOwn(assets, id)) { return assets[id] }
+        var camelizedId = camelize(id);
+        if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
+        var PascalCaseId = capitalize(camelizedId);
+        if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
+        // fallback to prototype chain
+        var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
+        if (warnMissing && !res) {
+            warn(
+                'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
+                options
+            );
+        }
+        return res
+    }
+
+    /*  */
+
+
+
+    function validateProp (
+        key,
+        propOptions,
+        propsData,
+        vm
+    ) {
+        var prop = propOptions[key];
+        var absent = !hasOwn(propsData, key);
+        var value = propsData[key];
+        // boolean casting
+        var booleanIndex = getTypeIndex(Boolean, prop.type);
+        if (booleanIndex > -1) {
+            if (absent && !hasOwn(prop, 'default')) {
+                value = false;
+            } else if (value === '' || value === hyphenate(key)) {
+                // only cast empty string / same name to boolean if
+                // boolean has higher priority
+                var stringIndex = getTypeIndex(String, prop.type);
+                if (stringIndex < 0 || booleanIndex < stringIndex) {
+                    value = true;
+                }
+            }
+        }
+        // check default value
+        if (value === undefined) {
+            value = getPropDefaultValue(vm, prop, key);
+            // since the default value is a fresh copy,
+            // make sure to observe it.
+            var prevShouldObserve = shouldObserve;
+            toggleObserving(true);
+            observe(value);
+            toggleObserving(prevShouldObserve);
+        }
+        {
+            assertProp(prop, key, value, vm, absent);
+        }
+        return value
+    }
+
+    /**
+     * Get the default value of a prop.
+     */
+    function getPropDefaultValue (vm, prop, key) {
+        // no default, return undefined
+        if (!hasOwn(prop, 'default')) {
+            return undefined
+        }
+        var def = prop.default;
+        // warn against non-factory defaults for Object & Array
+        if (isObject(def)) {
+            warn(
+                'Invalid default value for prop "' + key + '": ' +
+                'Props with type Object/Array must use a factory function ' +
+                'to return the default value.',
+                vm
+            );
+        }
+        // the raw prop value was also undefined from previous render,
+        // return previous default value to avoid unnecessary watcher trigger
+        if (vm && vm.$options.propsData &&
+            vm.$options.propsData[key] === undefined &&
+            vm._props[key] !== undefined
+        ) {
+            return vm._props[key]
+        }
+        // call factory function for non-Function types
+        // a value is Function if its prototype is function even across different execution context
+        return typeof def === 'function' && getType(prop.type) !== 'Function'
+            ? def.call(vm)
+            : def
+    }
+
+    /**
+     * Assert whether a prop is valid.
+     */
+    function assertProp (
+        prop,
+        name,
+        value,
+        vm,
+        absent
+    ) {
+        if (prop.required && absent) {
+            warn(
+                'Missing required prop: "' + name + '"',
+                vm
+            );
+            return
+        }
+        if (value == null && !prop.required) {
+            return
+        }
+        var type = prop.type;
+        var valid = !type || type === true;
+        var expectedTypes = [];
+        if (type) {
+            if (!Array.isArray(type)) {
+                type = [type];
+            }
+            for (var i = 0; i < type.length && !valid; i++) {
+                var assertedType = assertType(value, type[i], vm);
+                expectedTypes.push(assertedType.expectedType || '');
+                valid = assertedType.valid;
+            }
+        }
+
+        var haveExpectedTypes = expectedTypes.some(function (t) { return t; });
+        if (!valid && haveExpectedTypes) {
+            warn(
+                getInvalidTypeMessage(name, value, expectedTypes),
+                vm
+            );
+            return
+        }
+        var validator = prop.validator;
+        if (validator) {
+            if (!validator(value)) {
+                warn(
+                    'Invalid prop: custom validator check failed for prop "' + name + '".',
+                    vm
+                );
+            }
+        }
+    }
+
+    var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol|BigInt)$/;
+
+    function assertType (value, type, vm) {
+        var valid;
+        var expectedType = getType(type);
+        if (simpleCheckRE.test(expectedType)) {
+            var t = typeof value;
+            valid = t === expectedType.toLowerCase();
+            // for primitive wrapper objects
+            if (!valid && t === 'object') {
+                valid = value instanceof type;
+            }
+        } else if (expectedType === 'Object') {
+            valid = isPlainObject(value);
+        } else if (expectedType === 'Array') {
+            valid = Array.isArray(value);
+        } else {
+            try {
+                valid = value instanceof type;
+            } catch (e) {
+                warn('Invalid prop type: "' + String(type) + '" is not a constructor', vm);
+                valid = false;
+            }
+        }
+        return {
+            valid: valid,
+            expectedType: expectedType
+        }
+    }
+
+    var functionTypeCheckRE = /^\s*function (\w+)/;
+
+    /**
+     * Use function string name to check built-in types,
+     * because a simple equality check will fail when running
+     * across different vms / iframes.
+     */
+    function getType (fn) {
+        var match = fn && fn.toString().match(functionTypeCheckRE);
+        return match ? match[1] : ''
+    }
+
+    function isSameType (a, b) {
+        return getType(a) === getType(b)
+    }
+
+    function getTypeIndex (type, expectedTypes) {
+        if (!Array.isArray(expectedTypes)) {
+            return isSameType(expectedTypes, type) ? 0 : -1
+        }
+        for (var i = 0, len = expectedTypes.length; i < len; i++) {
+            if (isSameType(expectedTypes[i], type)) {
+                return i
+            }
+        }
+        return -1
+    }
+
+    function getInvalidTypeMessage (name, value, expectedTypes) {
+        var message = "Invalid prop: type check failed for prop \"" + name + "\"." +
+            " Expected " + (expectedTypes.map(capitalize).join(', '));
+        var expectedType = expectedTypes[0];
+        var receivedType = toRawType(value);
+        // check if we need to specify expected value
+        if (
+            expectedTypes.length === 1 &&
+            isExplicable(expectedType) &&
+            isExplicable(typeof value) &&
+            !isBoolean(expectedType, receivedType)
+        ) {
+            message += " with value " + (styleValue(value, expectedType));
+        }
+        message += ", got " + receivedType + " ";
+        // check if we need to specify received value
+        if (isExplicable(receivedType)) {
+            message += "with value " + (styleValue(value, receivedType)) + ".";
+        }
+        return message
+    }
+
+    function styleValue (value, type) {
+        if (type === 'String') {
+            return ("\"" + value + "\"")
+        } else if (type === 'Number') {
+            return ("" + (Number(value)))
+        } else {
+            return ("" + value)
+        }
+    }
+
+    var EXPLICABLE_TYPES = ['string', 'number', 'boolean'];
+    function isExplicable (value) {
+        return EXPLICABLE_TYPES.some(function (elem) { return value.toLowerCase() === elem; })
+    }
+
+    function isBoolean () {
+        var args = [], len = arguments.length;
+        while ( len-- ) args[ len ] = arguments[ len ];
+
+        return args.some(function (elem) { return elem.toLowerCase() === 'boolean'; })
+    }
+
+    /*  */
+
+    function handleError (err, vm, info) {
+        // Deactivate deps tracking while processing error handler to avoid possible infinite rendering.
+        // See: https://github.com/vuejs/vuex/issues/1505
+        pushTarget();
+        try {
+            if (vm) {
+                var cur = vm;
+                while ((cur = cur.$parent)) {
+                    var hooks = cur.$options.errorCaptured;
+                    if (hooks) {
+                        for (var i = 0; i < hooks.length; i++) {
+                            try {
+                                var capture = hooks[i].call(cur, err, vm, info) === false;
+                                if (capture) { return }
+                            } catch (e) {
+                                globalHandleError(e, cur, 'errorCaptured hook');
+                            }
+                        }
+                    }
+                }
+            }
+            globalHandleError(err, vm, info);
+        } finally {
+            popTarget();
+        }
+    }
+
+    function invokeWithErrorHandling (
+        handler,
+        context,
+        args,
+        vm,
+        info
+    ) {
+        var res;
+        try {
+            res = args ? handler.apply(context, args) : handler.call(context);
+            if (res && !res._isVue && isPromise(res) && !res._handled) {
+                res.catch(function (e) { return handleError(e, vm, info + " (Promise/async)"); });
+                // issue #9511
+                // avoid catch triggering multiple times when nested calls
+                res._handled = true;
+            }
+        } catch (e) {
+            handleError(e, vm, info);
+        }
+        return res
+    }
+
+    function globalHandleError (err, vm, info) {
+        if (config.errorHandler) {
+            try {
+                return config.errorHandler.call(null, err, vm, info)
+            } catch (e) {
+                // if the user intentionally throws the original error in the handler,
+                // do not log it twice
+                if (e !== err) {
+                    logError(e, null, 'config.errorHandler');
+                }
+            }
+        }
+        logError(err, vm, info);
+    }
+
+    function logError (err, vm, info) {
+        {
+            warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
+        }
+        /* istanbul ignore else */
+        if ((inBrowser || inWeex) && typeof console !== 'undefined') {
+            console.error(err);
+        } else {
+            throw err
+        }
+    }
+
+    /*  */
+
+    var isUsingMicroTask = false;
+
+    var callbacks = [];
+    var pending = false;
+
+    function flushCallbacks () {
+        pending = false;
+        var copies = callbacks.slice(0);
+        callbacks.length = 0;
+        for (var i = 0; i < copies.length; i++) {
+            copies[i]();
+        }
+    }
+
+    // Here we have async deferring wrappers using microtasks.
+    // In 2.5 we used (macro) tasks (in combination with microtasks).
+    // However, it has subtle problems when state is changed right before repaint
+    // (e.g. #6813, out-in transitions).
+    // Also, using (macro) tasks in event handler would cause some weird behaviors
+    // that cannot be circumvented (e.g. #7109, #7153, #7546, #7834, #8109).
+    // So we now use microtasks everywhere, again.
+    // A major drawback of this tradeoff is that there are some scenarios
+    // where microtasks have too high a priority and fire in between supposedly
+    // sequential events (e.g. #4521, #6690, which have workarounds)
+    // or even between bubbling of the same event (#6566).
+    var timerFunc;
+
+    // The nextTick behavior leverages the microtask queue, which can be accessed
+    // via either native Promise.then or MutationObserver.
+    // MutationObserver has wider support, however it is seriously bugged in
+    // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
+    // completely stops working after triggering a few times... so, if native
+    // Promise is available, we will use it:
+    /* istanbul ignore next, $flow-disable-line */
+    if (typeof Promise !== 'undefined' && isNative(Promise)) {
+        var p = Promise.resolve();
+        timerFunc = function () {
+            p.then(flushCallbacks);
+            // In problematic UIWebViews, Promise.then doesn't completely break, but
+            // it can get stuck in a weird state where callbacks are pushed into the
+            // microtask queue but the queue isn't being flushed, until the browser
+            // needs to do some other work, e.g. handle a timer. Therefore we can
+            // "force" the microtask queue to be flushed by adding an empty timer.
+            if (isIOS) { setTimeout(noop); }
+        };
+        isUsingMicroTask = true;
+    } else if (!isIE && typeof MutationObserver !== 'undefined' && (
+        isNative(MutationObserver) ||
+        // PhantomJS and iOS 7.x
+        MutationObserver.toString() === '[object MutationObserverConstructor]'
+    )) {
+        // Use MutationObserver where native Promise is not available,
+        // e.g. PhantomJS, iOS7, Android 4.4
+        // (#6466 MutationObserver is unreliable in IE11)
+        var counter = 1;
+        var observer = new MutationObserver(flushCallbacks);
+        var textNode = document.createTextNode(String(counter));
+        observer.observe(textNode, {
+            characterData: true
+        });
+        timerFunc = function () {
+            counter = (counter + 1) % 2;
+            textNode.data = String(counter);
+        };
+        isUsingMicroTask = true;
+    } else if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
+        // Fallback to setImmediate.
+        // Technically it leverages the (macro) task queue,
+        // but it is still a better choice than setTimeout.
+        timerFunc = function () {
+            setImmediate(flushCallbacks);
+        };
+    } else {
+        // Fallback to setTimeout.
+        timerFunc = function () {
+            setTimeout(flushCallbacks, 0);
+        };
+    }
+
+    function nextTick (cb, ctx) {
+        var _resolve;
+        callbacks.push(function () {
+            if (cb) {
+                try {
+                    cb.call(ctx);
+                } catch (e) {
+                    handleError(e, ctx, 'nextTick');
+                }
+            } else if (_resolve) {
+                _resolve(ctx);
+            }
+        });
+        if (!pending) {
+            pending = true;
+            timerFunc();
+        }
+        // $flow-disable-line
+        if (!cb && typeof Promise !== 'undefined') {
+            return new Promise(function (resolve) {
+                _resolve = resolve;
+            })
+        }
+    }
+
+    /*  */
+
+    var mark;
+    var measure;
+
+    {
+        var perf = inBrowser && window.performance;
+        /* istanbul ignore if */
+        if (
+            perf &&
+            perf.mark &&
+            perf.measure &&
+            perf.clearMarks &&
+            perf.clearMeasures
+        ) {
+            mark = function (tag) { return perf.mark(tag); };
+            measure = function (name, startTag, endTag) {
+                perf.measure(name, startTag, endTag);
+                perf.clearMarks(startTag);
+                perf.clearMarks(endTag);
+                // perf.clearMeasures(name)
+            };
+        }
+    }
+
+    /* not type checking this file because flow doesn't play well with Proxy */
+
+    var initProxy;
+
+    {
+        var allowedGlobals = makeMap(
+            'Infinity,undefined,NaN,isFinite,isNaN,' +
+            'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
+            'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,BigInt,' +
+            'require' // for Webpack/Browserify
+        );
+
+        var warnNonPresent = function (target, key) {
+            warn(
+                "Property or method \"" + key + "\" is not defined on the instance but " +
+                'referenced during render. Make sure that this property is reactive, ' +
+                'either in the data option, or for class-based components, by ' +
+                'initializing the property. ' +
+                'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
+                target
+            );
+        };
+
+        var warnReservedPrefix = function (target, key) {
+            warn(
+                "Property \"" + key + "\" must be accessed with \"$data." + key + "\" because " +
+                'properties starting with "$" or "_" are not proxied in the Vue instance to ' +
+                'prevent conflicts with Vue internals. ' +
+                'See: https://vuejs.org/v2/api/#data',
+                target
+            );
+        };
+
+        var hasProxy =
+            typeof Proxy !== 'undefined' && isNative(Proxy);
+
+        if (hasProxy) {
+            var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');
+            config.keyCodes = new Proxy(config.keyCodes, {
+                set: function set (target, key, value) {
+                    if (isBuiltInModifier(key)) {
+                        warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
+                        return false
+                    } else {
+                        target[key] = value;
+                        return true
+                    }
+                }
+            });
+        }
+
+        var hasHandler = {
+            has: function has (target, key) {
+                var has = key in target;
+                var isAllowed = allowedGlobals(key) ||
+                    (typeof key === 'string' && key.charAt(0) === '_' && !(key in target.$data));
+                if (!has && !isAllowed) {
+                    if (key in target.$data) { warnReservedPrefix(target, key); }
+                    else { warnNonPresent(target, key); }
+                }
+                return has || !isAllowed
+            }
+        };
+
+        var getHandler = {
+            get: function get (target, key) {
+                if (typeof key === 'string' && !(key in target)) {
+                    if (key in target.$data) { warnReservedPrefix(target, key); }
+                    else { warnNonPresent(target, key); }
+                }
+                return target[key]
+            }
+        };
+
+        initProxy = function initProxy (vm) {
+            if (hasProxy) {
+                // determine which proxy handler to use
+                var options = vm.$options;
+                var handlers = options.render && options.render._withStripped
+                    ? getHandler
+                    : hasHandler;
+                vm._renderProxy = new Proxy(vm, handlers);
+            } else {
+                vm._renderProxy = vm;
+            }
+        };
+    }
+
+    /*  */
+
+    var seenObjects = new _Set();
+
+    /**
+     * Recursively traverse an object to evoke all converted
+     * getters, so that every nested property inside the object
+     * is collected as a "deep" dependency.
+     */
+    function traverse (val) {
+        _traverse(val, seenObjects);
+        seenObjects.clear();
+    }
+
+    function _traverse (val, seen) {
+        var i, keys;
+        var isA = Array.isArray(val);
+        if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {
+            return
+        }
+        if (val.__ob__) {
+            var depId = val.__ob__.dep.id;
+            if (seen.has(depId)) {
+                return
+            }
+            seen.add(depId);
+        }
+        if (isA) {
+            i = val.length;
+            while (i--) { _traverse(val[i], seen); }
+        } else {
+            keys = Object.keys(val);
+            i = keys.length;
+            while (i--) { _traverse(val[keys[i]], seen); }
+        }
+    }
+
+    /*  */
+
+    var normalizeEvent = cached(function (name) {
+        var passive = name.charAt(0) === '&';
+        name = passive ? name.slice(1) : name;
+        var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
+        name = once$$1 ? name.slice(1) : name;
+        var capture = name.charAt(0) === '!';
+        name = capture ? name.slice(1) : name;
+        return {
+            name: name,
+            once: once$$1,
+            capture: capture,
+            passive: passive
+        }
+    });
+
+    function createFnInvoker (fns, vm) {
+        function invoker () {
+            var arguments$1 = arguments;
+
+            var fns = invoker.fns;
+            if (Array.isArray(fns)) {
+                var cloned = fns.slice();
+                for (var i = 0; i < cloned.length; i++) {
+                    invokeWithErrorHandling(cloned[i], null, arguments$1, vm, "v-on handler");
+                }
+            } else {
+                // return handler return value for single handlers
+                return invokeWithErrorHandling(fns, null, arguments, vm, "v-on handler")
+            }
+        }
+        invoker.fns = fns;
+        return invoker
+    }
+
+    function updateListeners (
+        on,
+        oldOn,
+        add,
+        remove$$1,
+        createOnceHandler,
+        vm
+    ) {
+        var name, def$$1, cur, old, event;
+        for (name in on) {
+            def$$1 = cur = on[name];
+            old = oldOn[name];
+            event = normalizeEvent(name);
+            if (isUndef(cur)) {
+                warn(
+                    "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
+                    vm
+                );
+            } else if (isUndef(old)) {
+                if (isUndef(cur.fns)) {
+                    cur = on[name] = createFnInvoker(cur, vm);
+                }
+                if (isTrue(event.once)) {
+                    cur = on[name] = createOnceHandler(event.name, cur, event.capture);
+                }
+                add(event.name, cur, event.capture, event.passive, event.params);
+            } else if (cur !== old) {
+                old.fns = cur;
+                on[name] = old;
+            }
+        }
+        for (name in oldOn) {
+            if (isUndef(on[name])) {
+                event = normalizeEvent(name);
+                remove$$1(event.name, oldOn[name], event.capture);
+            }
+        }
+    }
+
+    /*  */
+
+    function mergeVNodeHook (def, hookKey, hook) {
+        if (def instanceof VNode) {
+            def = def.data.hook || (def.data.hook = {});
+        }
+        var invoker;
+        var oldHook = def[hookKey];
+
+        function wrappedHook () {
+            hook.apply(this, arguments);
+            // important: remove merged hook to ensure it's called only once
+            // and prevent memory leak
+            remove(invoker.fns, wrappedHook);
+        }
+
+        if (isUndef(oldHook)) {
+            // no existing hook
+            invoker = createFnInvoker([wrappedHook]);
+        } else {
+            /* istanbul ignore if */
+            if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
+                // already a merged invoker
+                invoker = oldHook;
+                invoker.fns.push(wrappedHook);
+            } else {
+                // existing plain hook
+                invoker = createFnInvoker([oldHook, wrappedHook]);
+            }
+        }
+
+        invoker.merged = true;
+        def[hookKey] = invoker;
+    }
+
+    /*  */
+
+    function extractPropsFromVNodeData (
+        data,
+        Ctor,
+        tag
+    ) {
+        // we are only extracting raw values here.
+        // validation and default values are handled in the child
+        // component itself.
+        var propOptions = Ctor.options.props;
+        if (isUndef(propOptions)) {
+            return
+        }
+        var res = {};
+        var attrs = data.attrs;
+        var props = data.props;
+        if (isDef(attrs) || isDef(props)) {
+            for (var key in propOptions) {
+                var altKey = hyphenate(key);
+                {
+                    var keyInLowerCase = key.toLowerCase();
+                    if (
+                        key !== keyInLowerCase &&
+                        attrs && hasOwn(attrs, keyInLowerCase)
+                    ) {
+                        tip(
+                            "Prop \"" + keyInLowerCase + "\" is passed to component " +
+                            (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
+                            " \"" + key + "\". " +
+                            "Note that HTML attributes are case-insensitive and camelCased " +
+                            "props need to use their kebab-case equivalents when using in-DOM " +
+                            "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\"."
+                        );
+                    }
+                }
+                checkProp(res, props, key, altKey, true) ||
+                checkProp(res, attrs, key, altKey, false);
+            }
+        }
+        return res
+    }
+
+    function checkProp (
+        res,
+        hash,
+        key,
+        altKey,
+        preserve
+    ) {
+        if (isDef(hash)) {
+            if (hasOwn(hash, key)) {
+                res[key] = hash[key];
+                if (!preserve) {
+                    delete hash[key];
+                }
+                return true
+            } else if (hasOwn(hash, altKey)) {
+                res[key] = hash[altKey];
+                if (!preserve) {
+                    delete hash[altKey];
+                }
+                return true
+            }
+        }
+        return false
+    }
+
+    /*  */
+
+    // The template compiler attempts to minimize the need for normalization by
+    // statically analyzing the template at compile time.
+    //
+    // For plain HTML markup, normalization can be completely skipped because the
+    // generated render function is guaranteed to return Array<VNode>. There are
+    // two cases where extra normalization is needed:
+
+    // 1. When the children contains components - because a functional component
+    // may return an Array instead of a single root. In this case, just a simple
+    // normalization is needed - if any child is an Array, we flatten the whole
+    // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
+    // because functional components already normalize their own children.
+    function simpleNormalizeChildren (children) {
+        for (var i = 0; i < children.length; i++) {
+            if (Array.isArray(children[i])) {
+                return Array.prototype.concat.apply([], children)
+            }
+        }
+        return children
+    }
+
+    // 2. When the children contains constructs that always generated nested Arrays,
+    // e.g. <template>, <slot>, v-for, or when the children is provided by user
+    // with hand-written render functions / JSX. In such cases a full normalization
+    // is needed to cater to all possible types of children values.
+    function normalizeChildren (children) {
+        return isPrimitive(children)
+            ? [createTextVNode(children)]
+            : Array.isArray(children)
+                ? normalizeArrayChildren(children)
+                : undefined
+    }
+
+    function isTextNode (node) {
+        return isDef(node) && isDef(node.text) && isFalse(node.isComment)
+    }
+
+    function normalizeArrayChildren (children, nestedIndex) {
+        var res = [];
+        var i, c, lastIndex, last;
+        for (i = 0; i < children.length; i++) {
+            c = children[i];
+            if (isUndef(c) || typeof c === 'boolean') { continue }
+            lastIndex = res.length - 1;
+            last = res[lastIndex];
+            //  nested
+            if (Array.isArray(c)) {
+                if (c.length > 0) {
+                    c = normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i));
+                    // merge adjacent text nodes
+                    if (isTextNode(c[0]) && isTextNode(last)) {
+                        res[lastIndex] = createTextVNode(last.text + (c[0]).text);
+                        c.shift();
+                    }
+                    res.push.apply(res, c);
+                }
+            } else if (isPrimitive(c)) {
+                if (isTextNode(last)) {
+                    // merge adjacent text nodes
+                    // this is necessary for SSR hydration because text nodes are
+                    // essentially merged when rendered to HTML strings
+                    res[lastIndex] = createTextVNode(last.text + c);
+                } else if (c !== '') {
+                    // convert primitive to vnode
+                    res.push(createTextVNode(c));
+                }
+            } else {
+                if (isTextNode(c) && isTextNode(last)) {
+                    // merge adjacent text nodes
+                    res[lastIndex] = createTextVNode(last.text + c.text);
+                } else {
+                    // default key for nested array children (likely generated by v-for)
+                    if (isTrue(children._isVList) &&
+                        isDef(c.tag) &&
+                        isUndef(c.key) &&
+                        isDef(nestedIndex)) {
+                        c.key = "__vlist" + nestedIndex + "_" + i + "__";
+                    }
+                    res.push(c);
+                }
+            }
+        }
+        return res
+    }
+
+    /*  */
+
+    function initProvide (vm) {
+        var provide = vm.$options.provide;
+        if (provide) {
+            vm._provided = typeof provide === 'function'
+                ? provide.call(vm)
+                : provide;
+        }
+    }
+
+    function initInjections (vm) {
+        var result = resolveInject(vm.$options.inject, vm);
+        if (result) {
+            toggleObserving(false);
+            Object.keys(result).forEach(function (key) {
+                /* istanbul ignore else */
+                {
+                    defineReactive$$1(vm, key, result[key], function () {
+                        warn(
+                            "Avoid mutating an injected value directly since the changes will be " +
+                            "overwritten whenever the provided component re-renders. " +
+                            "injection being mutated: \"" + key + "\"",
+                            vm
+                        );
+                    });
+                }
+            });
+            toggleObserving(true);
+        }
+    }
+
+    function resolveInject (inject, vm) {
+        if (inject) {
+            // inject is :any because flow is not smart enough to figure out cached
+            var result = Object.create(null);
+            var keys = hasSymbol
+                ? Reflect.ownKeys(inject)
+                : Object.keys(inject);
+
+            for (var i = 0; i < keys.length; i++) {
+                var key = keys[i];
+                // #6574 in case the inject object is observed...
+                if (key === '__ob__') { continue }
+                var provideKey = inject[key].from;
+                var source = vm;
+                while (source) {
+                    if (source._provided && hasOwn(source._provided, provideKey)) {
+                        result[key] = source._provided[provideKey];
+                        break
+                    }
+                    source = source.$parent;
+                }
+                if (!source) {
+                    if ('default' in inject[key]) {
+                        var provideDefault = inject[key].default;
+                        result[key] = typeof provideDefault === 'function'
+                            ? provideDefault.call(vm)
+                            : provideDefault;
+                    } else {
+                        warn(("Injection \"" + key + "\" not found"), vm);
+                    }
+                }
+            }
+            return result
+        }
+    }
+
+    /*  */
+
+
+
+    /**
+     * Runtime helper for resolving raw children VNodes into a slot object.
+     */
+    function resolveSlots (
+        children,
+        context
+    ) {
+        if (!children || !children.length) {
+            return {}
+        }
+        var slots = {};
+        for (var i = 0, l = children.length; i < l; i++) {
+            var child = children[i];
+            var data = child.data;
+            // remove slot attribute if the node is resolved as a Vue slot node
+            if (data && data.attrs && data.attrs.slot) {
+                delete data.attrs.slot;
+            }
+            // named slots should only be respected if the vnode was rendered in the
+            // same context.
+            if ((child.context === context || child.fnContext === context) &&
+                data && data.slot != null
+            ) {
+                var name = data.slot;
+                var slot = (slots[name] || (slots[name] = []));
+                if (child.tag === 'template') {
+                    slot.push.apply(slot, child.children || []);
+                } else {
+                    slot.push(child);
+                }
+            } else {
+                (slots.default || (slots.default = [])).push(child);
+            }
+        }
+        // ignore slots that contains only whitespace
+        for (var name$1 in slots) {
+            if (slots[name$1].every(isWhitespace)) {
+                delete slots[name$1];
+            }
+        }
+        return slots
+    }
+
+    function isWhitespace (node) {
+        return (node.isComment && !node.asyncFactory) || node.text === ' '
+    }
+
+    /*  */
+
+    function isAsyncPlaceholder (node) {
+        return node.isComment && node.asyncFactory
+    }
+
+    /*  */
+
+    function normalizeScopedSlots (
+        slots,
+        normalSlots,
+        prevSlots
+    ) {
+        var res;
+        var hasNormalSlots = Object.keys(normalSlots).length > 0;
+        var isStable = slots ? !!slots.$stable : !hasNormalSlots;
+        var key = slots && slots.$key;
+        if (!slots) {
+            res = {};
+        } else if (slots._normalized) {
+            // fast path 1: child component re-render only, parent did not change
+            return slots._normalized
+        } else if (
+            isStable &&
+            prevSlots &&
+            prevSlots !== emptyObject &&
+            key === prevSlots.$key &&
+            !hasNormalSlots &&
+            !prevSlots.$hasNormal
+        ) {
+            // fast path 2: stable scoped slots w/ no normal slots to proxy,
+            // only need to normalize once
+            return prevSlots
+        } else {
+            res = {};
+            for (var key$1 in slots) {
+                if (slots[key$1] && key$1[0] !== '$') {
+                    res[key$1] = normalizeScopedSlot(normalSlots, key$1, slots[key$1]);
+                }
+            }
+        }
+        // expose normal slots on scopedSlots
+        for (var key$2 in normalSlots) {
+            if (!(key$2 in res)) {
+                res[key$2] = proxyNormalSlot(normalSlots, key$2);
+            }
+        }
+        // avoriaz seems to mock a non-extensible $scopedSlots object
+        // and when that is passed down this would cause an error
+        if (slots && Object.isExtensible(slots)) {
+            (slots)._normalized = res;
+        }
+        def(res, '$stable', isStable);
+        def(res, '$key', key);
+        def(res, '$hasNormal', hasNormalSlots);
+        return res
+    }
+
+    function normalizeScopedSlot(normalSlots, key, fn) {
+        var normalized = function () {
+            var res = arguments.length ? fn.apply(null, arguments) : fn({});
+            res = res && typeof res === 'object' && !Array.isArray(res)
+                ? [res] // single vnode
+                : normalizeChildren(res);
+            var vnode = res && res[0];
+            return res && (
+                !vnode ||
+                (res.length === 1 && vnode.isComment && !isAsyncPlaceholder(vnode)) // #9658, #10391
+            ) ? undefined
+                : res
+        };
+        // this is a slot using the new v-slot syntax without scope. although it is
+        // compiled as a scoped slot, render fn users would expect it to be present
+        // on this.$slots because the usage is semantically a normal slot.
+        if (fn.proxy) {
+            Object.defineProperty(normalSlots, key, {
+                get: normalized,
+                enumerable: true,
+                configurable: true
+            });
+        }
+        return normalized
+    }
+
+    function proxyNormalSlot(slots, key) {
+        return function () { return slots[key]; }
+    }
+
+    /*  */
+
+    /**
+     * Runtime helper for rendering v-for lists.
+     */
+    function renderList (
+        val,
+        render
+    ) {
+        var ret, i, l, keys, key;
+        if (Array.isArray(val) || typeof val === 'string') {
+            ret = new Array(val.length);
+            for (i = 0, l = val.length; i < l; i++) {
+                ret[i] = render(val[i], i);
+            }
+        } else if (typeof val === 'number') {
+            ret = new Array(val);
+            for (i = 0; i < val; i++) {
+                ret[i] = render(i + 1, i);
+            }
+        } else if (isObject(val)) {
+            if (hasSymbol && val[Symbol.iterator]) {
+                ret = [];
+                var iterator = val[Symbol.iterator]();
+                var result = iterator.next();
+                while (!result.done) {
+                    ret.push(render(result.value, ret.length));
+                    result = iterator.next();
+                }
+            } else {
+                keys = Object.keys(val);
+                ret = new Array(keys.length);
+                for (i = 0, l = keys.length; i < l; i++) {
+                    key = keys[i];
+                    ret[i] = render(val[key], key, i);
+                }
+            }
+        }
+        if (!isDef(ret)) {
+            ret = [];
+        }
+        (ret)._isVList = true;
+        return ret
+    }
+
+    /*  */
+
+    /**
+     * Runtime helper for rendering <slot>
+     */
+    function renderSlot (
+        name,
+        fallbackRender,
+        props,
+        bindObject
+    ) {
+        var scopedSlotFn = this.$scopedSlots[name];
+        var nodes;
+        if (scopedSlotFn) {
+            // scoped slot
+            props = props || {};
+            if (bindObject) {
+                if (!isObject(bindObject)) {
+                    warn('slot v-bind without argument expects an Object', this);
+                }
+                props = extend(extend({}, bindObject), props);
+            }
+            nodes =
+                scopedSlotFn(props) ||
+                (typeof fallbackRender === 'function' ? fallbackRender() : fallbackRender);
+        } else {
+            nodes =
+                this.$slots[name] ||
+                (typeof fallbackRender === 'function' ? fallbackRender() : fallbackRender);
+        }
+
+        var target = props && props.slot;
+        if (target) {
+            return this.$createElement('template', { slot: target }, nodes)
+        } else {
+            return nodes
+        }
+    }
+
+    /*  */
+
+    /**
+     * Runtime helper for resolving filters
+     */
+    function resolveFilter (id) {
+        return resolveAsset(this.$options, 'filters', id, true) || identity
+    }
+
+    /*  */
+
+    function isKeyNotMatch (expect, actual) {
+        if (Array.isArray(expect)) {
+            return expect.indexOf(actual) === -1
+        } else {
+            return expect !== actual
+        }
+    }
+
+    /**
+     * Runtime helper for checking keyCodes from config.
+     * exposed as Vue.prototype._k
+     * passing in eventKeyName as last argument separately for backwards compat
+     */
+    function checkKeyCodes (
+        eventKeyCode,
+        key,
+        builtInKeyCode,
+        eventKeyName,
+        builtInKeyName
+    ) {
+        var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+        if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+            return isKeyNotMatch(builtInKeyName, eventKeyName)
+        } else if (mappedKeyCode) {
+            return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+        } else if (eventKeyName) {
+            return hyphenate(eventKeyName) !== key
+        }
+        return eventKeyCode === undefined
+    }
+
+    /*  */
+
+    /**
+     * Runtime helper for merging v-bind="object" into a VNode's data.
+     */
+    function bindObjectProps (
+        data,
+        tag,
+        value,
+        asProp,
+        isSync
+    ) {
+        if (value) {
+            if (!isObject(value)) {
+                warn(
+                    'v-bind without argument expects an Object or Array value',
+                    this
+                );
+            } else {
+                if (Array.isArray(value)) {
+                    value = toObject(value);
+                }
+                var hash;
+                var loop = function ( key ) {
+                    if (
+                        key === 'class' ||
+                        key === 'style' ||
+                        isReservedAttribute(key)
+                    ) {
+                        hash = data;
+                    } else {
+                        var type = data.attrs && data.attrs.type;
+                        hash = asProp || config.mustUseProp(tag, type, key)
+                            ? data.domProps || (data.domProps = {})
+                            : data.attrs || (data.attrs = {});
+                    }
+                    var camelizedKey = camelize(key);
+                    var hyphenatedKey = hyphenate(key);
+                    if (!(camelizedKey in hash) && !(hyphenatedKey in hash)) {
+                        hash[key] = value[key];
+
+                        if (isSync) {
+                            var on = data.on || (data.on = {});
+                            on[("update:" + key)] = function ($event) {
+                                value[key] = $event;
+                            };
+                        }
+                    }
+                };
+
+                for (var key in value) loop( key );
+            }
+        }
+        return data
+    }
+
+    /*  */
+
+    /**
+     * Runtime helper for rendering static trees.
+     */
+    function renderStatic (
+        index,
+        isInFor
+    ) {
+        var cached = this._staticTrees || (this._staticTrees = []);
+        var tree = cached[index];
+        // if has already-rendered static tree and not inside v-for,
+        // we can reuse the same tree.
+        if (tree && !isInFor) {
+            return tree
+        }
+        // otherwise, render a fresh tree.
+        tree = cached[index] = this.$options.staticRenderFns[index].call(
+            this._renderProxy,
+            null,
+            this // for render fns generated for functional component templates
+        );
+        markStatic(tree, ("__static__" + index), false);
+        return tree
+    }
+
+    /**
+     * Runtime helper for v-once.
+     * Effectively it means marking the node as static with a unique key.
+     */
+    function markOnce (
+        tree,
+        index,
+        key
+    ) {
+        markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
+        return tree
+    }
+
+    function markStatic (
+        tree,
+        key,
+        isOnce
+    ) {
+        if (Array.isArray(tree)) {
+            for (var i = 0; i < tree.length; i++) {
+                if (tree[i] && typeof tree[i] !== 'string') {
+                    markStaticNode(tree[i], (key + "_" + i), isOnce);
+                }
+            }
+        } else {
+            markStaticNode(tree, key, isOnce);
+        }
+    }
+
+    function markStaticNode (node, key, isOnce) {
+        node.isStatic = true;
+        node.key = key;
+        node.isOnce = isOnce;
+    }
+
+    /*  */
+
+    function bindObjectListeners (data, value) {
+        if (value) {
+            if (!isPlainObject(value)) {
+                warn(
+                    'v-on without argument expects an Object value',
+                    this
+                );
+            } else {
+                var on = data.on = data.on ? extend({}, data.on) : {};
+                for (var key in value) {
+                    var existing = on[key];
+                    var ours = value[key];
+                    on[key] = existing ? [].concat(existing, ours) : ours;
+                }
+            }
+        }
+        return data
+    }
+
+    /*  */
+
+    function resolveScopedSlots (
+        fns, // see flow/vnode
+        res,
+        // the following are added in 2.6
+        hasDynamicKeys,
+        contentHashKey
+    ) {
+        res = res || { $stable: !hasDynamicKeys };
+        for (var i = 0; i < fns.length; i++) {
+            var slot = fns[i];
+            if (Array.isArray(slot)) {
+                resolveScopedSlots(slot, res, hasDynamicKeys);
+            } else if (slot) {
+                // marker for reverse proxying v-slot without scope on this.$slots
+                if (slot.proxy) {
+                    slot.fn.proxy = true;
+                }
+                res[slot.key] = slot.fn;
+            }
+        }
+        if (contentHashKey) {
+            (res).$key = contentHashKey;
+        }
+        return res
+    }
+
+    /*  */
+
+    function bindDynamicKeys (baseObj, values) {
+        for (var i = 0; i < values.length; i += 2) {
+            var key = values[i];
+            if (typeof key === 'string' && key) {
+                baseObj[values[i]] = values[i + 1];
+            } else if (key !== '' && key !== null) {
+                // null is a special value for explicitly removing a binding
+                warn(
+                    ("Invalid value for dynamic directive argument (expected string or null): " + key),
+                    this
+                );
+            }
+        }
+        return baseObj
+    }
+
+    // helper to dynamically append modifier runtime markers to event names.
+    // ensure only append when value is already string, otherwise it will be cast
+    // to string and cause the type check to miss.
+    function prependModifier (value, symbol) {
+        return typeof value === 'string' ? symbol + value : value
+    }
+
+    /*  */
+
+    function installRenderHelpers (target) {
+        target._o = markOnce;
+        target._n = toNumber;
+        target._s = toString;
+        target._l = renderList;
+        target._t = renderSlot;
+        target._q = looseEqual;
+        target._i = looseIndexOf;
+        target._m = renderStatic;
+        target._f = resolveFilter;
+        target._k = checkKeyCodes;
+        target._b = bindObjectProps;
+        target._v = createTextVNode;
+        target._e = createEmptyVNode;
+        target._u = resolveScopedSlots;
+        target._g = bindObjectListeners;
+        target._d = bindDynamicKeys;
+        target._p = prependModifier;
+    }
+
+    /*  */
+
+    function FunctionalRenderContext (
+        data,
+        props,
+        children,
+        parent,
+        Ctor
+    ) {
+        var this$1 = this;
+
+        var options = Ctor.options;
+        // ensure the createElement function in functional components
+        // gets a unique context - this is necessary for correct named slot check
+        var contextVm;
+        if (hasOwn(parent, '_uid')) {
+            contextVm = Object.create(parent);
+            // $flow-disable-line
+            contextVm._original = parent;
+        } else {
+            // the context vm passed in is a functional context as well.
+            // in this case we want to make sure we are able to get a hold to the
+            // real context instance.
+            contextVm = parent;
+            // $flow-disable-line
+            parent = parent._original;
+        }
+        var isCompiled = isTrue(options._compiled);
+        var needNormalization = !isCompiled;
+
+        this.data = data;
+        this.props = props;
+        this.children = children;
+        this.parent = parent;
+        this.listeners = data.on || emptyObject;
+        this.injections = resolveInject(options.inject, parent);
+        this.slots = function () {
+            if (!this$1.$slots) {
+                normalizeScopedSlots(
+                    data.scopedSlots,
+                    this$1.$slots = resolveSlots(children, parent)
+                );
+            }
+            return this$1.$slots
+        };
+
+        Object.defineProperty(this, 'scopedSlots', ({
+            enumerable: true,
+            get: function get () {
+                return normalizeScopedSlots(data.scopedSlots, this.slots())
+            }
+        }));
+
+        // support for compiled functional template
+        if (isCompiled) {
+            // exposing $options for renderStatic()
+            this.$options = options;
+            // pre-resolve slots for renderSlot()
+            this.$slots = this.slots();
+            this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
+        }
+
+        if (options._scopeId) {
+            this._c = function (a, b, c, d) {
+                var vnode = createElement(contextVm, a, b, c, d, needNormalization);
+                if (vnode && !Array.isArray(vnode)) {
+                    vnode.fnScopeId = options._scopeId;
+                    vnode.fnContext = parent;
+                }
+                return vnode
+            };
+        } else {
+            this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
+        }
+    }
+
+    installRenderHelpers(FunctionalRenderContext.prototype);
+
+    function createFunctionalComponent (
+        Ctor,
+        propsData,
+        data,
+        contextVm,
+        children
+    ) {
+        var options = Ctor.options;
+        var props = {};
+        var propOptions = options.props;
+        if (isDef(propOptions)) {
+            for (var key in propOptions) {
+                props[key] = validateProp(key, propOptions, propsData || emptyObject);
+            }
+        } else {
+            if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
+            if (isDef(data.props)) { mergeProps(props, data.props); }
+        }
+
+        var renderContext = new FunctionalRenderContext(
+            data,
+            props,
+            children,
+            contextVm,
+            Ctor
+        );
+
+        var vnode = options.render.call(null, renderContext._c, renderContext);
+
+        if (vnode instanceof VNode) {
+            return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
+        } else if (Array.isArray(vnode)) {
+            var vnodes = normalizeChildren(vnode) || [];
+            var res = new Array(vnodes.length);
+            for (var i = 0; i < vnodes.length; i++) {
+                res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
+            }
+            return res
+        }
+    }
+
+    function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
+        // #7817 clone node before setting fnContext, otherwise if the node is reused
+        // (e.g. it was from a cached normal slot) the fnContext causes named slots
+        // that should not be matched to match.
+        var clone = cloneVNode(vnode);
+        clone.fnContext = contextVm;
+        clone.fnOptions = options;
+        {
+            (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
+        }
+        if (data.slot) {
+            (clone.data || (clone.data = {})).slot = data.slot;
+        }
+        return clone
+    }
+
+    function mergeProps (to, from) {
+        for (var key in from) {
+            to[camelize(key)] = from[key];
+        }
+    }
+
+    /*  */
+
+    /*  */
+
+    /*  */
+
+    /*  */
+
+    // inline hooks to be invoked on component VNodes during patch
+    var componentVNodeHooks = {
+        init: function init (vnode, hydrating) {
+            if (
+                vnode.componentInstance &&
+                !vnode.componentInstance._isDestroyed &&
+                vnode.data.keepAlive
+            ) {
+                // kept-alive components, treat as a patch
+                var mountedNode = vnode; // work around flow
+                componentVNodeHooks.prepatch(mountedNode, mountedNode);
+            } else {
+                var child = vnode.componentInstance = createComponentInstanceForVnode(
+                    vnode,
+                    activeInstance
+                );
+                child.$mount(hydrating ? vnode.elm : undefined, hydrating);
+            }
+        },
+
+        prepatch: function prepatch (oldVnode, vnode) {
+            var options = vnode.componentOptions;
+            var child = vnode.componentInstance = oldVnode.componentInstance;
+            updateChildComponent(
+                child,
+                options.propsData, // updated props
+                options.listeners, // updated listeners
+                vnode, // new parent vnode
+                options.children // new children
+            );
+        },
+
+        insert: function insert (vnode) {
+            var context = vnode.context;
+            var componentInstance = vnode.componentInstance;
+            if (!componentInstance._isMounted) {
+                componentInstance._isMounted = true;
+                callHook(componentInstance, 'mounted');
+            }
+            if (vnode.data.keepAlive) {
+                if (context._isMounted) {
+                    // vue-router#1212
+                    // During updates, a kept-alive component's child components may
+                    // change, so directly walking the tree here may call activated hooks
+                    // on incorrect children. Instead we push them into a queue which will
+                    // be processed after the whole patch process ended.
+                    queueActivatedComponent(componentInstance);
+                } else {
+                    activateChildComponent(componentInstance, true /* direct */);
+                }
+            }
+        },
+
+        destroy: function destroy (vnode) {
+            var componentInstance = vnode.componentInstance;
+            if (!componentInstance._isDestroyed) {
+                if (!vnode.data.keepAlive) {
+                    componentInstance.$destroy();
+                } else {
+                    deactivateChildComponent(componentInstance, true /* direct */);
+                }
+            }
+        }
+    };
+
+    var hooksToMerge = Object.keys(componentVNodeHooks);
+
+    function createComponent (
+        Ctor,
+        data,
+        context,
+        children,
+        tag
+    ) {
+        if (isUndef(Ctor)) {
+            return
+        }
+
+        var baseCtor = context.$options._base;
+
+        // plain options object: turn it into a constructor
+        if (isObject(Ctor)) {
+            Ctor = baseCtor.extend(Ctor);
+        }
+
+        // if at this stage it's not a constructor or an async component factory,
+        // reject.
+        if (typeof Ctor !== 'function') {
+            {
+                warn(("Invalid Component definition: " + (String(Ctor))), context);
+            }
+            return
+        }
+
+        // async component
+        var asyncFactory;
+        if (isUndef(Ctor.cid)) {
+            asyncFactory = Ctor;
+            Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
+            if (Ctor === undefined) {
+                // return a placeholder node for async component, which is rendered
+                // as a comment node but preserves all the raw information for the node.
+                // the information will be used for async server-rendering and hydration.
+                return createAsyncPlaceholder(
+                    asyncFactory,
+                    data,
+                    context,
+                    children,
+                    tag
+                )
+            }
+        }
+
+        data = data || {};
+
+        // resolve constructor options in case global mixins are applied after
+        // component constructor creation
+        resolveConstructorOptions(Ctor);
+
+        // transform component v-model data into props & events
+        if (isDef(data.model)) {
+            transformModel(Ctor.options, data);
+        }
+
+        // extract props
+        var propsData = extractPropsFromVNodeData(data, Ctor, tag);
+
+        // functional component
+        if (isTrue(Ctor.options.functional)) {
+            return createFunctionalComponent(Ctor, propsData, data, context, children)
+        }
+
+        // extract listeners, since these needs to be treated as
+        // child component listeners instead of DOM listeners
+        var listeners = data.on;
+        // replace with listeners with .native modifier
+        // so it gets processed during parent component patch.
+        data.on = data.nativeOn;
+
+        if (isTrue(Ctor.options.abstract)) {
+            // abstract components do not keep anything
+            // other than props & listeners & slot
+
+            // work around flow
+            var slot = data.slot;
+            data = {};
+            if (slot) {
+                data.slot = slot;
+            }
+        }
+
+        // install component management hooks onto the placeholder node
+        installComponentHooks(data);
+
+        // return a placeholder vnode
+        var name = Ctor.options.name || tag;
+        var vnode = new VNode(
+            ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
+            data, undefined, undefined, undefined, context,
+            { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
+            asyncFactory
+        );
+
+        return vnode
+    }
+
+    function createComponentInstanceForVnode (
+        // we know it's MountedComponentVNode but flow doesn't
+        vnode,
+        // activeInstance in lifecycle state
+        parent
+    ) {
+        var options = {
+            _isComponent: true,
+            _parentVnode: vnode,
+            parent: parent
+        };
+        // check inline-template render functions
+        var inlineTemplate = vnode.data.inlineTemplate;
+        if (isDef(inlineTemplate)) {
+            options.render = inlineTemplate.render;
+            options.staticRenderFns = inlineTemplate.staticRenderFns;
+        }
+        return new vnode.componentOptions.Ctor(options)
+    }
+
+    function installComponentHooks (data) {
+        var hooks = data.hook || (data.hook = {});
+        for (var i = 0; i < hooksToMerge.length; i++) {
+            var key = hooksToMerge[i];
+            var existing = hooks[key];
+            var toMerge = componentVNodeHooks[key];
+            if (existing !== toMerge && !(existing && existing._merged)) {
+                hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
+            }
+        }
+    }
+
+    function mergeHook$1 (f1, f2) {
+        var merged = function (a, b) {
+            // flow complains about extra args which is why we use any
+            f1(a, b);
+            f2(a, b);
+        };
+        merged._merged = true;
+        return merged
+    }
+
+    // transform component v-model info (value and callback) into
+    // prop and event handler respectively.
+    function transformModel (options, data) {
+        var prop = (options.model && options.model.prop) || 'value';
+        var event = (options.model && options.model.event) || 'input'
+        ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
+        var on = data.on || (data.on = {});
+        var existing = on[event];
+        var callback = data.model.callback;
+        if (isDef(existing)) {
+            if (
+                Array.isArray(existing)
+                    ? existing.indexOf(callback) === -1
+                    : existing !== callback
+            ) {
+                on[event] = [callback].concat(existing);
+            }
+        } else {
+            on[event] = callback;
+        }
+    }
+
+    /*  */
+
+    var SIMPLE_NORMALIZE = 1;
+    var ALWAYS_NORMALIZE = 2;
+
+    // wrapper function for providing a more flexible interface
+    // without getting yelled at by flow
+    function createElement (
+        context,
+        tag,
+        data,
+        children,
+        normalizationType,
+        alwaysNormalize
+    ) {
+        if (Array.isArray(data) || isPrimitive(data)) {
+            normalizationType = children;
+            children = data;
+            data = undefined;
+        }
+        if (isTrue(alwaysNormalize)) {
+            normalizationType = ALWAYS_NORMALIZE;
+        }
+        return _createElement(context, tag, data, children, normalizationType)
+    }
+
+    function _createElement (
+        context,
+        tag,
+        data,
+        children,
+        normalizationType
+    ) {
+        if (isDef(data) && isDef((data).__ob__)) {
+            warn(
+                "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
+                'Always create fresh vnode data objects in each render!',
+                context
+            );
+            return createEmptyVNode()
+        }
+        // object syntax in v-bind
+        if (isDef(data) && isDef(data.is)) {
+            tag = data.is;
+        }
+        if (!tag) {
+            // in case of component :is set to falsy value
+            return createEmptyVNode()
+        }
+        // warn against non-primitive key
+        if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+        ) {
+            {
+                warn(
+                    'Avoid using non-primitive value as key, ' +
+                    'use string/number value instead.',
+                    context
+                );
+            }
+        }
+        // support single function children as default scoped slot
+        if (Array.isArray(children) &&
+            typeof children[0] === 'function'
+        ) {
+            data = data || {};
+            data.scopedSlots = { default: children[0] };
+            children.length = 0;
+        }
+        if (normalizationType === ALWAYS_NORMALIZE) {
+            children = normalizeChildren(children);
+        } else if (normalizationType === SIMPLE_NORMALIZE) {
+            children = simpleNormalizeChildren(children);
+        }
+        var vnode, ns;
+        if (typeof tag === 'string') {
+            var Ctor;
+            ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+            if (config.isReservedTag(tag)) {
+                // platform built-in elements
+                if (isDef(data) && isDef(data.nativeOn) && data.tag !== 'component') {
+                    warn(
+                        ("The .native modifier for v-on is only valid on components but it was used on <" + tag + ">."),
+                        context
+                    );
+                }
+                vnode = new VNode(
+                    config.parsePlatformTagName(tag), data, children,
+                    undefined, undefined, context
+                );
+            } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+                // component
+                vnode = createComponent(Ctor, data, context, children, tag);
+            } else {
+                // unknown or unlisted namespaced elements
+                // check at runtime because it may get assigned a namespace when its
+                // parent normalizes children
+                vnode = new VNode(
+                    tag, data, children,
+                    undefined, undefined, context
+                );
+            }
+        } else {
+            // direct component options / constructor
+            vnode = createComponent(tag, data, context, children);
+        }
+        if (Array.isArray(vnode)) {
+            return vnode
+        } else if (isDef(vnode)) {
+            if (isDef(ns)) { applyNS(vnode, ns); }
+            if (isDef(data)) { registerDeepBindings(data); }
+            return vnode
+        } else {
+            return createEmptyVNode()
+        }
+    }
+
+    function applyNS (vnode, ns, force) {
+        vnode.ns = ns;
+        if (vnode.tag === 'foreignObject') {
+            // use default namespace inside foreignObject
+            ns = undefined;
+            force = true;
+        }
+        if (isDef(vnode.children)) {
+            for (var i = 0, l = vnode.children.length; i < l; i++) {
+                var child = vnode.children[i];
+                if (isDef(child.tag) && (
+                    isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+                    applyNS(child, ns, force);
+                }
+            }
+        }
+    }
+
+    // ref #5318
+    // necessary to ensure parent re-render when deep bindings like :style and
+    // :class are used on slot nodes
+    function registerDeepBindings (data) {
+        if (isObject(data.style)) {
+            traverse(data.style);
+        }
+        if (isObject(data.class)) {
+            traverse(data.class);
+        }
+    }
+
+    /*  */
+
+    function initRender (vm) {
+        vm._vnode = null; // the root of the child tree
+        vm._staticTrees = null; // v-once cached trees
+        var options = vm.$options;
+        var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
+        var renderContext = parentVnode && parentVnode.context;
+        vm.$slots = resolveSlots(options._renderChildren, renderContext);
+        vm.$scopedSlots = emptyObject;
+        // bind the createElement fn to this instance
+        // so that we get proper render context inside it.
+        // args order: tag, data, children, normalizationType, alwaysNormalize
+        // internal version is used by render functions compiled from templates
+        vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
+        // normalization is always applied for the public version, used in
+        // user-written render functions.
+        vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+
+        // $attrs & $listeners are exposed for easier HOC creation.
+        // they need to be reactive so that HOCs using them are always updated
+        var parentData = parentVnode && parentVnode.data;
+
+        /* istanbul ignore else */
+        {
+            defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
+                !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
+            }, true);
+            defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
+                !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
+            }, true);
+        }
+    }
+
+    var currentRenderingInstance = null;
+
+    function renderMixin (Vue) {
+        // install runtime convenience helpers
+        installRenderHelpers(Vue.prototype);
+
+        Vue.prototype.$nextTick = function (fn) {
+            return nextTick(fn, this)
+        };
+
+        Vue.prototype._render = function () {
+            var vm = this;
+            var ref = vm.$options;
+            var render = ref.render;
+            var _parentVnode = ref._parentVnode;
+
+            if (_parentVnode) {
+                vm.$scopedSlots = normalizeScopedSlots(
+                    _parentVnode.data.scopedSlots,
+                    vm.$slots,
+                    vm.$scopedSlots
+                );
+            }
+
+            // set parent vnode. this allows render functions to have access
+            // to the data on the placeholder node.
+            vm.$vnode = _parentVnode;
+            // render self
+            var vnode;
+            try {
+                // There's no need to maintain a stack because all render fns are called
+                // separately from one another. Nested component's render fns are called
+                // when parent component is patched.
+                currentRenderingInstance = vm;
+                vnode = render.call(vm._renderProxy, vm.$createElement);
+            } catch (e) {
+                handleError(e, vm, "render");
+                // return error render result,
+                // or previous vnode to prevent render error causing blank component
+                /* istanbul ignore else */
+                if (vm.$options.renderError) {
+                    try {
+                        vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
+                    } catch (e) {
+                        handleError(e, vm, "renderError");
+                        vnode = vm._vnode;
+                    }
+                } else {
+                    vnode = vm._vnode;
+                }
+            } finally {
+                currentRenderingInstance = null;
+            }
+            // if the returned array contains only a single node, allow it
+            if (Array.isArray(vnode) && vnode.length === 1) {
+                vnode = vnode[0];
+            }
+            // return empty vnode in case the render function errored out
+            if (!(vnode instanceof VNode)) {
+                if (Array.isArray(vnode)) {
+                    warn(
+                        'Multiple root nodes returned from render function. Render function ' +
+                        'should return a single root node.',
+                        vm
+                    );
+                }
+                vnode = createEmptyVNode();
+            }
+            // set parent
+            vnode.parent = _parentVnode;
+            return vnode
+        };
+    }
+
+    /*  */
+
+    function ensureCtor (comp, base) {
+        if (
+            comp.__esModule ||
+            (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+        ) {
+            comp = comp.default;
+        }
+        return isObject(comp)
+            ? base.extend(comp)
+            : comp
+    }
+
+    function createAsyncPlaceholder (
+        factory,
+        data,
+        context,
+        children,
+        tag
+    ) {
+        var node = createEmptyVNode();
+        node.asyncFactory = factory;
+        node.asyncMeta = { data: data, context: context, children: children, tag: tag };
+        return node
+    }
+
+    function resolveAsyncComponent (
+        factory,
+        baseCtor
+    ) {
+        if (isTrue(factory.error) && isDef(factory.errorComp)) {
+            return factory.errorComp
+        }
+
+        if (isDef(factory.resolved)) {
+            return factory.resolved
+        }
+
+        var owner = currentRenderingInstance;
+        if (owner && isDef(factory.owners) && factory.owners.indexOf(owner) === -1) {
+            // already pending
+            factory.owners.push(owner);
+        }
+
+        if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+            return factory.loadingComp
+        }
+
+        if (owner && !isDef(factory.owners)) {
+            var owners = factory.owners = [owner];
+            var sync = true;
+            var timerLoading = null;
+            var timerTimeout = null
+
+            ;(owner).$on('hook:destroyed', function () { return remove(owners, owner); });
+
+            var forceRender = function (renderCompleted) {
+                for (var i = 0, l = owners.length; i < l; i++) {
+                    (owners[i]).$forceUpdate();
+                }
+
+                if (renderCompleted) {
+                    owners.length = 0;
+                    if (timerLoading !== null) {
+                        clearTimeout(timerLoading);
+                        timerLoading = null;
+                    }
+                    if (timerTimeout !== null) {
+                        clearTimeout(timerTimeout);
+                        timerTimeout = null;
+                    }
+                }
+            };
+
+            var resolve = once(function (res) {
+                // cache resolved
+                factory.resolved = ensureCtor(res, baseCtor);
+                // invoke callbacks only if this is not a synchronous resolve
+                // (async resolves are shimmed as synchronous during SSR)
+                if (!sync) {
+                    forceRender(true);
+                } else {
+                    owners.length = 0;
+                }
+            });
+
+            var reject = once(function (reason) {
+                warn(
+                    "Failed to resolve async component: " + (String(factory)) +
+                    (reason ? ("\nReason: " + reason) : '')
+                );
+                if (isDef(factory.errorComp)) {
+                    factory.error = true;
+                    forceRender(true);
+                }
+            });
+
+            var res = factory(resolve, reject);
+
+            if (isObject(res)) {
+                if (isPromise(res)) {
+                    // () => Promise
+                    if (isUndef(factory.resolved)) {
+                        res.then(resolve, reject);
+                    }
+                } else if (isPromise(res.component)) {
+                    res.component.then(resolve, reject);
+
+                    if (isDef(res.error)) {
+                        factory.errorComp = ensureCtor(res.error, baseCtor);
+                    }
+
+                    if (isDef(res.loading)) {
+                        factory.loadingComp = ensureCtor(res.loading, baseCtor);
+                        if (res.delay === 0) {
+                            factory.loading = true;
+                        } else {
+                            timerLoading = setTimeout(function () {
+                                timerLoading = null;
+                                if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                                    factory.loading = true;
+                                    forceRender(false);
+                                }
+                            }, res.delay || 200);
+                        }
+                    }
+
+                    if (isDef(res.timeout)) {
+                        timerTimeout = setTimeout(function () {
+                            timerTimeout = null;
+                            if (isUndef(factory.resolved)) {
+                                reject(
+                                    "timeout (" + (res.timeout) + "ms)"
+                                );
+                            }
+                        }, res.timeout);
+                    }
+                }
+            }
+
+            sync = false;
+            // return in case resolved synchronously
+            return factory.loading
+                ? factory.loadingComp
+                : factory.resolved
+        }
+    }
+
+    /*  */
+
+    function getFirstComponentChild (children) {
+        if (Array.isArray(children)) {
+            for (var i = 0; i < children.length; i++) {
+                var c = children[i];
+                if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
+                    return c
+                }
+            }
+        }
+    }
+
+    /*  */
+
+    /*  */
+
+    function initEvents (vm) {
+        vm._events = Object.create(null);
+        vm._hasHookEvent = false;
+        // init parent attached events
+        var listeners = vm.$options._parentListeners;
+        if (listeners) {
+            updateComponentListeners(vm, listeners);
+        }
+    }
+
+    var target;
+
+    function add (event, fn) {
+        target.$on(event, fn);
+    }
+
+    function remove$1 (event, fn) {
+        target.$off(event, fn);
+    }
+
+    function createOnceHandler (event, fn) {
+        var _target = target;
+        return function onceHandler () {
+            var res = fn.apply(null, arguments);
+            if (res !== null) {
+                _target.$off(event, onceHandler);
+            }
+        }
+    }
+
+    function updateComponentListeners (
+        vm,
+        listeners,
+        oldListeners
+    ) {
+        target = vm;
+        updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+        target = undefined;
+    }
+
+    function eventsMixin (Vue) {
+        var hookRE = /^hook:/;
+        Vue.prototype.$on = function (event, fn) {
+            var vm = this;
+            if (Array.isArray(event)) {
+                for (var i = 0, l = event.length; i < l; i++) {
+                    vm.$on(event[i], fn);
+                }
+            } else {
+                (vm._events[event] || (vm._events[event] = [])).push(fn);
+                // optimize hook:event cost by using a boolean flag marked at registration
+                // instead of a hash lookup
+                if (hookRE.test(event)) {
+                    vm._hasHookEvent = true;
+                }
+            }
+            return vm
+        };
+
+        Vue.prototype.$once = function (event, fn) {
+            var vm = this;
+            function on () {
+                vm.$off(event, on);
+                fn.apply(vm, arguments);
+            }
+            on.fn = fn;
+            vm.$on(event, on);
+            return vm
+        };
+
+        Vue.prototype.$off = function (event, fn) {
+            var vm = this;
+            // all
+            if (!arguments.length) {
+                vm._events = Object.create(null);
+                return vm
+            }
+            // array of events
+            if (Array.isArray(event)) {
+                for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
+                    vm.$off(event[i$1], fn);
+                }
+                return vm
+            }
+            // specific event
+            var cbs = vm._events[event];
+            if (!cbs) {
+                return vm
+            }
+            if (!fn) {
+                vm._events[event] = null;
+                return vm
+            }
+            // specific handler
+            var cb;
+            var i = cbs.length;
+            while (i--) {
+                cb = cbs[i];
+                if (cb === fn || cb.fn === fn) {
+                    cbs.splice(i, 1);
+                    break
+                }
+            }
+            return vm
+        };
+
+        Vue.prototype.$emit = function (event) {
+            var vm = this;
+            {
+                var lowerCaseEvent = event.toLowerCase();
+                if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
+                    tip(
+                        "Event \"" + lowerCaseEvent + "\" is emitted in component " +
+                        (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
+                        "Note that HTML attributes are case-insensitive and you cannot use " +
+                        "v-on to listen to camelCase events when using in-DOM templates. " +
+                        "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
+                    );
+                }
+            }
+            var cbs = vm._events[event];
+            if (cbs) {
+                cbs = cbs.length > 1 ? toArray(cbs) : cbs;
+                var args = toArray(arguments, 1);
+                var info = "event handler for \"" + event + "\"";
+                for (var i = 0, l = cbs.length; i < l; i++) {
+                    invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+                }
+            }
+            return vm
+        };
+    }
+
+    /*  */
+
+    var activeInstance = null;
+    var isUpdatingChildComponent = false;
+
+    function setActiveInstance(vm) {
+        var prevActiveInstance = activeInstance;
+        activeInstance = vm;
+        return function () {
+            activeInstance = prevActiveInstance;
+        }
+    }
+
+    function initLifecycle (vm) {
+        var options = vm.$options;
+
+        // locate first non-abstract parent
+        var parent = options.parent;
+        if (parent && !options.abstract) {
+            while (parent.$options.abstract && parent.$parent) {
+                parent = parent.$parent;
+            }
+            parent.$children.push(vm);
+        }
+
+        vm.$parent = parent;
+        vm.$root = parent ? parent.$root : vm;
+
+        vm.$children = [];
+        vm.$refs = {};
+
+        vm._watcher = null;
+        vm._inactive = null;
+        vm._directInactive = false;
+        vm._isMounted = false;
+        vm._isDestroyed = false;
+        vm._isBeingDestroyed = false;
+    }
+
+    function lifecycleMixin (Vue) {
+        Vue.prototype._update = function (vnode, hydrating) {
+            var vm = this;
+            var prevEl = vm.$el;
+            var prevVnode = vm._vnode;
+            var restoreActiveInstance = setActiveInstance(vm);
+            vm._vnode = vnode;
+            // Vue.prototype.__patch__ is injected in entry points
+            // based on the rendering backend used.
+            if (!prevVnode) {
+                // initial render
+                vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+            } else {
+                // updates
+                vm.$el = vm.__patch__(prevVnode, vnode);
+            }
+            restoreActiveInstance();
+            // update __vue__ reference
+            if (prevEl) {
+                prevEl.__vue__ = null;
+            }
+            if (vm.$el) {
+                vm.$el.__vue__ = vm;
+            }
+            // if parent is an HOC, update its $el as well
+            if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
+                vm.$parent.$el = vm.$el;
+            }
+            // updated hook is called by the scheduler to ensure that children are
+            // updated in a parent's updated hook.
+        };
+
+        Vue.prototype.$forceUpdate = function () {
+            var vm = this;
+            if (vm._watcher) {
+                vm._watcher.update();
+            }
+        };
+
+        Vue.prototype.$destroy = function () {
+            var vm = this;
+            if (vm._isBeingDestroyed) {
+                return
+            }
+            callHook(vm, 'beforeDestroy');
+            vm._isBeingDestroyed = true;
+            // remove self from parent
+            var parent = vm.$parent;
+            if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
+                remove(parent.$children, vm);
+            }
+            // teardown watchers
+            if (vm._watcher) {
+                vm._watcher.teardown();
+            }
+            var i = vm._watchers.length;
+            while (i--) {
+                vm._watchers[i].teardown();
+            }
+            // remove reference from data ob
+            // frozen object may not have observer.
+            if (vm._data.__ob__) {
+                vm._data.__ob__.vmCount--;
+            }
+            // call the last hook...
+            vm._isDestroyed = true;
+            // invoke destroy hooks on current rendered tree
+            vm.__patch__(vm._vnode, null);
+            // fire destroyed hook
+            callHook(vm, 'destroyed');
+            // turn off all instance listeners.
+            vm.$off();
+            // remove __vue__ reference
+            if (vm.$el) {
+                vm.$el.__vue__ = null;
+            }
+            // release circular reference (#6759)
+            if (vm.$vnode) {
+                vm.$vnode.parent = null;
+            }
+        };
+    }
+
+    function mountComponent (
+        vm,
+        el,
+        hydrating
+    ) {
+        vm.$el = el;
+        if (!vm.$options.render) {
+            vm.$options.render = createEmptyVNode;
+            {
+                /* istanbul ignore if */
+                if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
+                    vm.$options.el || el) {
+                    warn(
+                        'You are using the runtime-only build of Vue where the template ' +
+                        'compiler is not available. Either pre-compile the templates into ' +
+                        'render functions, or use the compiler-included build.',
+                        vm
+                    );
+                } else {
+                    warn(
+                        'Failed to mount component: template or render function not defined.',
+                        vm
+                    );
+                }
+            }
+        }
+        callHook(vm, 'beforeMount');
+
+        var updateComponent;
+        /* istanbul ignore if */
+        if (config.performance && mark) {
+            updateComponent = function () {
+                var name = vm._name;
+                var id = vm._uid;
+                var startTag = "vue-perf-start:" + id;
+                var endTag = "vue-perf-end:" + id;
+
+                mark(startTag);
+                var vnode = vm._render();
+                mark(endTag);
+                measure(("vue " + name + " render"), startTag, endTag);
+
+                mark(startTag);
+                vm._update(vnode, hydrating);
+                mark(endTag);
+                measure(("vue " + name + " patch"), startTag, endTag);
+            };
+        } else {
+            updateComponent = function () {
+                vm._update(vm._render(), hydrating);
+            };
+        }
+
+        // we set this to vm._watcher inside the watcher's constructor
+        // since the watcher's initial patch may call $forceUpdate (e.g. inside child
+        // component's mounted hook), which relies on vm._watcher being already defined
+        new Watcher(vm, updateComponent, noop, {
+            before: function before () {
+                if (vm._isMounted && !vm._isDestroyed) {
+                    callHook(vm, 'beforeUpdate');
+                }
+            }
+        }, true /* isRenderWatcher */);
+        hydrating = false;
+
+        // manually mounted instance, call mounted on self
+        // mounted is called for render-created child components in its inserted hook
+        if (vm.$vnode == null) {
+            vm._isMounted = true;
+            callHook(vm, 'mounted');
+        }
+        return vm
+    }
+
+    function updateChildComponent (
+        vm,
+        propsData,
+        listeners,
+        parentVnode,
+        renderChildren
+    ) {
+        {
+            isUpdatingChildComponent = true;
+        }
+
+        // determine whether component has slot children
+        // we need to do this before overwriting $options._renderChildren.
+
+        // check if there are dynamic scopedSlots (hand-written or compiled but with
+        // dynamic slot names). Static scoped slots compiled from template has the
+        // "$stable" marker.
+        var newScopedSlots = parentVnode.data.scopedSlots;
+        var oldScopedSlots = vm.$scopedSlots;
+        var hasDynamicScopedSlot = !!(
+            (newScopedSlots && !newScopedSlots.$stable) ||
+            (oldScopedSlots !== emptyObject && !oldScopedSlots.$stable) ||
+            (newScopedSlots && vm.$scopedSlots.$key !== newScopedSlots.$key) ||
+            (!newScopedSlots && vm.$scopedSlots.$key)
+        );
+
+        // Any static slot children from the parent may have changed during parent's
+        // update. Dynamic scoped slots may also have changed. In such cases, a forced
+        // update is necessary to ensure correctness.
+        var needsForceUpdate = !!(
+            renderChildren ||               // has new static slots
+            vm.$options._renderChildren ||  // has old static slots
+            hasDynamicScopedSlot
+        );
+
+        vm.$options._parentVnode = parentVnode;
+        vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+
+        if (vm._vnode) { // update child tree's parent
+            vm._vnode.parent = parentVnode;
+        }
+        vm.$options._renderChildren = renderChildren;
+
+        // update $attrs and $listeners hash
+        // these are also reactive so they may trigger child update if the child
+        // used them during render
+        vm.$attrs = parentVnode.data.attrs || emptyObject;
+        vm.$listeners = listeners || emptyObject;
+
+        // update props
+        if (propsData && vm.$options.props) {
+            toggleObserving(false);
+            var props = vm._props;
+            var propKeys = vm.$options._propKeys || [];
+            for (var i = 0; i < propKeys.length; i++) {
+                var key = propKeys[i];
+                var propOptions = vm.$options.props; // wtf flow?
+                props[key] = validateProp(key, propOptions, propsData, vm);
+            }
+            toggleObserving(true);
+            // keep a copy of raw propsData
+            vm.$options.propsData = propsData;
+        }
+
+        // update listeners
+        listeners = listeners || emptyObject;
+        var oldListeners = vm.$options._parentListeners;
+        vm.$options._parentListeners = listeners;
+        updateComponentListeners(vm, listeners, oldListeners);
+
+        // resolve slots + force update if has children
+        if (needsForceUpdate) {
+            vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+            vm.$forceUpdate();
+        }
+
+        {
+            isUpdatingChildComponent = false;
+        }
+    }
+
+    function isInInactiveTree (vm) {
+        while (vm && (vm = vm.$parent)) {
+            if (vm._inactive) { return true }
+        }
+        return false
+    }
+
+    function activateChildComponent (vm, direct) {
+        if (direct) {
+            vm._directInactive = false;
+            if (isInInactiveTree(vm)) {
+                return
+            }
+        } else if (vm._directInactive) {
+            return
+        }
+        if (vm._inactive || vm._inactive === null) {
+            vm._inactive = false;
+            for (var i = 0; i < vm.$children.length; i++) {
+                activateChildComponent(vm.$children[i]);
+            }
+            callHook(vm, 'activated');
+        }
+    }
+
+    function deactivateChildComponent (vm, direct) {
+        if (direct) {
+            vm._directInactive = true;
+            if (isInInactiveTree(vm)) {
+                return
+            }
+        }
+        if (!vm._inactive) {
+            vm._inactive = true;
+            for (var i = 0; i < vm.$children.length; i++) {
+                deactivateChildComponent(vm.$children[i]);
+            }
+            callHook(vm, 'deactivated');
+        }
+    }
+
+    function callHook (vm, hook) {
+        // #7573 disable dep collection when invoking lifecycle hooks
+        pushTarget();
+        var handlers = vm.$options[hook];
+        var info = hook + " hook";
+        if (handlers) {
+            for (var i = 0, j = handlers.length; i < j; i++) {
+                invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+            }
+        }
+        if (vm._hasHookEvent) {
+            vm.$emit('hook:' + hook);
+        }
+        popTarget();
+    }
+
+    /*  */
+
+    var MAX_UPDATE_COUNT = 100;
+
+    var queue = [];
+    var activatedChildren = [];
+    var has = {};
+    var circular = {};
+    var waiting = false;
+    var flushing = false;
+    var index = 0;
+
+    /**
+     * Reset the scheduler's state.
+     */
+    function resetSchedulerState () {
+        index = queue.length = activatedChildren.length = 0;
+        has = {};
+        {
+            circular = {};
+        }
+        waiting = flushing = false;
+    }
+
+    // Async edge case #6566 requires saving the timestamp when event listeners are
+    // attached. However, calling performance.now() has a perf overhead especially
+    // if the page has thousands of event listeners. Instead, we take a timestamp
+    // every time the scheduler flushes and use that for all event listeners
+    // attached during that flush.
+    var currentFlushTimestamp = 0;
+
+    // Async edge case fix requires storing an event listener's attach timestamp.
+    var getNow = Date.now;
+
+    // Determine what event timestamp the browser is using. Annoyingly, the
+    // timestamp can either be hi-res (relative to page load) or low-res
+    // (relative to UNIX epoch), so in order to compare time we have to use the
+    // same timestamp type when saving the flush timestamp.
+    // All IE versions use low-res event timestamps, and have problematic clock
+    // implementations (#9632)
+    if (inBrowser && !isIE) {
+        var performance = window.performance;
+        if (
+            performance &&
+            typeof performance.now === 'function' &&
+            getNow() > document.createEvent('Event').timeStamp
+        ) {
+            // if the event timestamp, although evaluated AFTER the Date.now(), is
+            // smaller than it, it means the event is using a hi-res timestamp,
+            // and we need to use the hi-res version for event listener timestamps as
+            // well.
+            getNow = function () { return performance.now(); };
+        }
+    }
+
+    /**
+     * Flush both queues and run the watchers.
+     */
+    function flushSchedulerQueue () {
+        currentFlushTimestamp = getNow();
+        flushing = true;
+        var watcher, id;
+
+        // Sort queue before flush.
+        // This ensures that:
+        // 1. Components are updated from parent to child. (because parent is always
+        //    created before the child)
+        // 2. A component's user watchers are run before its render watcher (because
+        //    user watchers are created before the render watcher)
+        // 3. If a component is destroyed during a parent component's watcher run,
+        //    its watchers can be skipped.
+        queue.sort(function (a, b) { return a.id - b.id; });
+
+        // do not cache length because more watchers might be pushed
+        // as we run existing watchers
+        for (index = 0; index < queue.length; index++) {
+            watcher = queue[index];
+            if (watcher.before) {
+                watcher.before();
+            }
+            id = watcher.id;
+            has[id] = null;
+            watcher.run();
+            // in dev build, check and stop circular updates.
+            if (has[id] != null) {
+                circular[id] = (circular[id] || 0) + 1;
+                if (circular[id] > MAX_UPDATE_COUNT) {
+                    warn(
+                        'You may have an infinite update loop ' + (
+                            watcher.user
+                                ? ("in watcher with expression \"" + (watcher.expression) + "\"")
+                                : "in a component render function."
+                        ),
+                        watcher.vm
+                    );
+                    break
+                }
+            }
+        }
+
+        // keep copies of post queues before resetting state
+        var activatedQueue = activatedChildren.slice();
+        var updatedQueue = queue.slice();
+
+        resetSchedulerState();
+
+        // call component updated and activated hooks
+        callActivatedHooks(activatedQueue);
+        callUpdatedHooks(updatedQueue);
+
+        // devtool hook
+        /* istanbul ignore if */
+        if (devtools && config.devtools) {
+            devtools.emit('flush');
+        }
+    }
+
+    function callUpdatedHooks (queue) {
+        var i = queue.length;
+        while (i--) {
+            var watcher = queue[i];
+            var vm = watcher.vm;
+            if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
+                callHook(vm, 'updated');
+            }
+        }
+    }
+
+    /**
+     * Queue a kept-alive component that was activated during patch.
+     * The queue will be processed after the entire tree has been patched.
+     */
+    function queueActivatedComponent (vm) {
+        // setting _inactive to false here so that a render function can
+        // rely on checking whether it's in an inactive tree (e.g. router-view)
+        vm._inactive = false;
+        activatedChildren.push(vm);
+    }
+
+    function callActivatedHooks (queue) {
+        for (var i = 0; i < queue.length; i++) {
+            queue[i]._inactive = true;
+            activateChildComponent(queue[i], true /* true */);
+        }
+    }
+
+    /**
+     * Push a watcher into the watcher queue.
+     * Jobs with duplicate IDs will be skipped unless it's
+     * pushed when the queue is being flushed.
+     */
+    function queueWatcher (watcher) {
+        var id = watcher.id;
+        if (has[id] == null) {
+            has[id] = true;
+            if (!flushing) {
+                queue.push(watcher);
+            } else {
+                // if already flushing, splice the watcher based on its id
+                // if already past its id, it will be run next immediately.
+                var i = queue.length - 1;
+                while (i > index && queue[i].id > watcher.id) {
+                    i--;
+                }
+                queue.splice(i + 1, 0, watcher);
+            }
+            // queue the flush
+            if (!waiting) {
+                waiting = true;
+
+                if (!config.async) {
+                    flushSchedulerQueue();
+                    return
+                }
+                nextTick(flushSchedulerQueue);
+            }
+        }
+    }
+
+    /*  */
+
+
+
+    var uid$2 = 0;
+
+    /**
+     * A watcher parses an expression, collects dependencies,
+     * and fires callback when the expression value changes.
+     * This is used for both the $watch() api and directives.
+     */
+    var Watcher = function Watcher (
+        vm,
+        expOrFn,
+        cb,
+        options,
+        isRenderWatcher
+    ) {
+        this.vm = vm;
+        if (isRenderWatcher) {
+            vm._watcher = this;
+        }
+        vm._watchers.push(this);
+        // options
+        if (options) {
+            this.deep = !!options.deep;
+            this.user = !!options.user;
+            this.lazy = !!options.lazy;
+            this.sync = !!options.sync;
+            this.before = options.before;
+        } else {
+            this.deep = this.user = this.lazy = this.sync = false;
+        }
+        this.cb = cb;
+        this.id = ++uid$2; // uid for batching
+        this.active = true;
+        this.dirty = this.lazy; // for lazy watchers
+        this.deps = [];
+        this.newDeps = [];
+        this.depIds = new _Set();
+        this.newDepIds = new _Set();
+        this.expression = expOrFn.toString();
+        // parse expression for getter
+        if (typeof expOrFn === 'function') {
+            this.getter = expOrFn;
+        } else {
+            this.getter = parsePath(expOrFn);
+            if (!this.getter) {
+                this.getter = noop;
+                warn(
+                    "Failed watching path: \"" + expOrFn + "\" " +
+                    'Watcher only accepts simple dot-delimited paths. ' +
+                    'For full control, use a function instead.',
+                    vm
+                );
+            }
+        }
+        this.value = this.lazy
+            ? undefined
+            : this.get();
+    };
+
+    /**
+     * Evaluate the getter, and re-collect dependencies.
+     */
+    Watcher.prototype.get = function get () {
+        pushTarget(this);
+        var value;
+        var vm = this.vm;
+        try {
+            value = this.getter.call(vm, vm);
+        } catch (e) {
+            if (this.user) {
+                handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+            } else {
+                throw e
+            }
+        } finally {
+            // "touch" every property so they are all tracked as
+            // dependencies for deep watching
+            if (this.deep) {
+                traverse(value);
+            }
+            popTarget();
+            this.cleanupDeps();
+        }
+        return value
+    };
+
+    /**
+     * Add a dependency to this directive.
+     */
+    Watcher.prototype.addDep = function addDep (dep) {
+        var id = dep.id;
+        if (!this.newDepIds.has(id)) {
+            this.newDepIds.add(id);
+            this.newDeps.push(dep);
+            if (!this.depIds.has(id)) {
+                dep.addSub(this);
+            }
+        }
+    };
+
+    /**
+     * Clean up for dependency collection.
+     */
+    Watcher.prototype.cleanupDeps = function cleanupDeps () {
+        var i = this.deps.length;
+        while (i--) {
+            var dep = this.deps[i];
+            if (!this.newDepIds.has(dep.id)) {
+                dep.removeSub(this);
+            }
+        }
+        var tmp = this.depIds;
+        this.depIds = this.newDepIds;
+        this.newDepIds = tmp;
+        this.newDepIds.clear();
+        tmp = this.deps;
+        this.deps = this.newDeps;
+        this.newDeps = tmp;
+        this.newDeps.length = 0;
+    };
+
+    /**
+     * Subscriber interface.
+     * Will be called when a dependency changes.
+     */
+    Watcher.prototype.update = function update () {
+        /* istanbul ignore else */
+        if (this.lazy) {
+            this.dirty = true;
+        } else if (this.sync) {
+            this.run();
+        } else {
+            queueWatcher(this);
+        }
+    };
+
+    /**
+     * Scheduler job interface.
+     * Will be called by the scheduler.
+     */
+    Watcher.prototype.run = function run () {
+        if (this.active) {
+            var value = this.get();
+            if (
+                value !== this.value ||
+                // Deep watchers and watchers on Object/Arrays should fire even
+                // when the value is the same, because the value may
+                // have mutated.
+                isObject(value) ||
+                this.deep
+            ) {
+                // set new value
+                var oldValue = this.value;
+                this.value = value;
+                if (this.user) {
+                    var info = "callback for watcher \"" + (this.expression) + "\"";
+                    invokeWithErrorHandling(this.cb, this.vm, [value, oldValue], this.vm, info);
+                } else {
+                    this.cb.call(this.vm, value, oldValue);
+                }
+            }
+        }
+    };
+
+    /**
+     * Evaluate the value of the watcher.
+     * This only gets called for lazy watchers.
+     */
+    Watcher.prototype.evaluate = function evaluate () {
+        this.value = this.get();
+        this.dirty = false;
+    };
+
+    /**
+     * Depend on all deps collected by this watcher.
+     */
+    Watcher.prototype.depend = function depend () {
+        var i = this.deps.length;
+        while (i--) {
+            this.deps[i].depend();
+        }
+    };
+
+    /**
+     * Remove self from all dependencies' subscriber list.
+     */
+    Watcher.prototype.teardown = function teardown () {
+        if (this.active) {
+            // remove self from vm's watcher list
+            // this is a somewhat expensive operation so we skip it
+            // if the vm is being destroyed.
+            if (!this.vm._isBeingDestroyed) {
+                remove(this.vm._watchers, this);
+            }
+            var i = this.deps.length;
+            while (i--) {
+                this.deps[i].removeSub(this);
+            }
+            this.active = false;
+        }
+    };
+
+    /*  */
+
+    var sharedPropertyDefinition = {
+        enumerable: true,
+        configurable: true,
+        get: noop,
+        set: noop
+    };
+
+    function proxy (target, sourceKey, key) {
+        sharedPropertyDefinition.get = function proxyGetter () {
+            return this[sourceKey][key]
+        };
+        sharedPropertyDefinition.set = function proxySetter (val) {
+            this[sourceKey][key] = val;
+        };
+        Object.defineProperty(target, key, sharedPropertyDefinition);
+    }
+
+    function initState (vm) {
+        vm._watchers = [];
+        var opts = vm.$options;
+        if (opts.props) { initProps(vm, opts.props); }
+        if (opts.methods) { initMethods(vm, opts.methods); }
+        if (opts.data) {
+            initData(vm);
+        } else {
+            observe(vm._data = {}, true /* asRootData */);
+        }
+        if (opts.computed) { initComputed(vm, opts.computed); }
+        if (opts.watch && opts.watch !== nativeWatch) {
+            initWatch(vm, opts.watch);
+        }
+    }
+
+    function initProps (vm, propsOptions) {
+        var propsData = vm.$options.propsData || {};
+        var props = vm._props = {};
+        // cache prop keys so that future props updates can iterate using Array
+        // instead of dynamic object key enumeration.
+        var keys = vm.$options._propKeys = [];
+        var isRoot = !vm.$parent;
+        // root instance props should be converted
+        if (!isRoot) {
+            toggleObserving(false);
+        }
+        var loop = function ( key ) {
+            keys.push(key);
+            var value = validateProp(key, propsOptions, propsData, vm);
+            /* istanbul ignore else */
+            {
+                var hyphenatedKey = hyphenate(key);
+                if (isReservedAttribute(hyphenatedKey) ||
+                    config.isReservedAttr(hyphenatedKey)) {
+                    warn(
+                        ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
+                        vm
+                    );
+                }
+                defineReactive$$1(props, key, value, function () {
+                    if (!isRoot && !isUpdatingChildComponent) {
+                        warn(
+                            "Avoid mutating a prop directly since the value will be " +
+                            "overwritten whenever the parent component re-renders. " +
+                            "Instead, use a data or computed property based on the prop's " +
+                            "value. Prop being mutated: \"" + key + "\"",
+                            vm
+                        );
+                    }
+                });
+            }
+            // static props are already proxied on the component's prototype
+            // during Vue.extend(). We only need to proxy props defined at
+            // instantiation here.
+            if (!(key in vm)) {
+                proxy(vm, "_props", key);
+            }
+        };
+
+        for (var key in propsOptions) loop( key );
+        toggleObserving(true);
+    }
+
+    function initData (vm) {
+        var data = vm.$options.data;
+        data = vm._data = typeof data === 'function'
+            ? getData(data, vm)
+            : data || {};
+        if (!isPlainObject(data)) {
+            data = {};
+            warn(
+                'data functions should return an object:\n' +
+                'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
+                vm
+            );
+        }
+        // proxy data on instance
+        var keys = Object.keys(data);
+        var props = vm.$options.props;
+        var methods = vm.$options.methods;
+        var i = keys.length;
+        while (i--) {
+            var key = keys[i];
+            {
+                if (methods && hasOwn(methods, key)) {
+                    warn(
+                        ("Method \"" + key + "\" has already been defined as a data property."),
+                        vm
+                    );
+                }
+            }
+            if (props && hasOwn(props, key)) {
+                warn(
+                    "The data property \"" + key + "\" is already declared as a prop. " +
+                    "Use prop default value instead.",
+                    vm
+                );
+            } else if (!isReserved(key)) {
+                proxy(vm, "_data", key);
+            }
+        }
+        // observe data
+        observe(data, true /* asRootData */);
+    }
+
+    function getData (data, vm) {
+        // #7573 disable dep collection when invoking data getters
+        pushTarget();
+        try {
+            return data.call(vm, vm)
+        } catch (e) {
+            handleError(e, vm, "data()");
+            return {}
+        } finally {
+            popTarget();
+        }
+    }
+
+    var computedWatcherOptions = { lazy: true };
+
+    function initComputed (vm, computed) {
+        // $flow-disable-line
+        var watchers = vm._computedWatchers = Object.create(null);
+        // computed properties are just getters during SSR
+        var isSSR = isServerRendering();
+
+        for (var key in computed) {
+            var userDef = computed[key];
+            var getter = typeof userDef === 'function' ? userDef : userDef.get;
+            if (getter == null) {
+                warn(
+                    ("Getter is missing for computed property \"" + key + "\"."),
+                    vm
+                );
+            }
+
+            if (!isSSR) {
+                // create internal watcher for the computed property.
+                watchers[key] = new Watcher(
+                    vm,
+                    getter || noop,
+                    noop,
+                    computedWatcherOptions
+                );
+            }
+
+            // component-defined computed properties are already defined on the
+            // component prototype. We only need to define computed properties defined
+            // at instantiation here.
+            if (!(key in vm)) {
+                defineComputed(vm, key, userDef);
+            } else {
+                if (key in vm.$data) {
+                    warn(("The computed property \"" + key + "\" is already defined in data."), vm);
+                } else if (vm.$options.props && key in vm.$options.props) {
+                    warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+                } else if (vm.$options.methods && key in vm.$options.methods) {
+                    warn(("The computed property \"" + key + "\" is already defined as a method."), vm);
+                }
+            }
+        }
+    }
+
+    function defineComputed (
+        target,
+        key,
+        userDef
+    ) {
+        var shouldCache = !isServerRendering();
+        if (typeof userDef === 'function') {
+            sharedPropertyDefinition.get = shouldCache
+                ? createComputedGetter(key)
+                : createGetterInvoker(userDef);
+            sharedPropertyDefinition.set = noop;
+        } else {
+            sharedPropertyDefinition.get = userDef.get
+                ? shouldCache && userDef.cache !== false
+                    ? createComputedGetter(key)
+                    : createGetterInvoker(userDef.get)
+                : noop;
+            sharedPropertyDefinition.set = userDef.set || noop;
+        }
+        if (sharedPropertyDefinition.set === noop) {
+            sharedPropertyDefinition.set = function () {
+                warn(
+                    ("Computed property \"" + key + "\" was assigned to but it has no setter."),
+                    this
+                );
+            };
+        }
+        Object.defineProperty(target, key, sharedPropertyDefinition);
+    }
+
+    function createComputedGetter (key) {
+        return function computedGetter () {
+            var watcher = this._computedWatchers && this._computedWatchers[key];
+            if (watcher) {
+                if (watcher.dirty) {
+                    watcher.evaluate();
+                }
+                if (Dep.target) {
+                    watcher.depend();
+                }
+                return watcher.value
+            }
+        }
+    }
+
+    function createGetterInvoker(fn) {
+        return function computedGetter () {
+            return fn.call(this, this)
+        }
+    }
+
+    function initMethods (vm, methods) {
+        var props = vm.$options.props;
+        for (var key in methods) {
+            {
+                if (typeof methods[key] !== 'function') {
+                    warn(
+                        "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
+                        "Did you reference the function correctly?",
+                        vm
+                    );
+                }
+                if (props && hasOwn(props, key)) {
+                    warn(
+                        ("Method \"" + key + "\" has already been defined as a prop."),
+                        vm
+                    );
+                }
+                if ((key in vm) && isReserved(key)) {
+                    warn(
+                        "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
+                        "Avoid defining component methods that start with _ or $."
+                    );
+                }
+            }
+            vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
+        }
+    }
+
+    function initWatch (vm, watch) {
+        for (var key in watch) {
+            var handler = watch[key];
+            if (Array.isArray(handler)) {
+                for (var i = 0; i < handler.length; i++) {
+                    createWatcher(vm, key, handler[i]);
+                }
+            } else {
+                createWatcher(vm, key, handler);
+            }
+        }
+    }
+
+    function createWatcher (
+        vm,
+        expOrFn,
+        handler,
+        options
+    ) {
+        if (isPlainObject(handler)) {
+            options = handler;
+            handler = handler.handler;
+        }
+        if (typeof handler === 'string') {
+            handler = vm[handler];
+        }
+        return vm.$watch(expOrFn, handler, options)
+    }
+
+    function stateMixin (Vue) {
+        // flow somehow has problems with directly declared definition object
+        // when using Object.defineProperty, so we have to procedurally build up
+        // the object here.
+        var dataDef = {};
+        dataDef.get = function () { return this._data };
+        var propsDef = {};
+        propsDef.get = function () { return this._props };
+        {
+            dataDef.set = function () {
+                warn(
+                    'Avoid replacing instance root $data. ' +
+                    'Use nested data properties instead.',
+                    this
+                );
+            };
+            propsDef.set = function () {
+                warn("$props is readonly.", this);
+            };
+        }
+        Object.defineProperty(Vue.prototype, '$data', dataDef);
+        Object.defineProperty(Vue.prototype, '$props', propsDef);
+
+        Vue.prototype.$set = set;
+        Vue.prototype.$delete = del;
+
+        Vue.prototype.$watch = function (
+            expOrFn,
+            cb,
+            options
+        ) {
+            var vm = this;
+            if (isPlainObject(cb)) {
+                return createWatcher(vm, expOrFn, cb, options)
+            }
+            options = options || {};
+            options.user = true;
+            var watcher = new Watcher(vm, expOrFn, cb, options);
+            if (options.immediate) {
+                var info = "callback for immediate watcher \"" + (watcher.expression) + "\"";
+                pushTarget();
+                invokeWithErrorHandling(cb, vm, [watcher.value], vm, info);
+                popTarget();
+            }
+            return function unwatchFn () {
+                watcher.teardown();
+            }
+        };
+    }
+
+    /*  */
+
+    var uid$3 = 0;
+
+    function initMixin (Vue) {
+        Vue.prototype._init = function (options) {
+            var vm = this;
+            // a uid
+            vm._uid = uid$3++;
+
+            var startTag, endTag;
+            /* istanbul ignore if */
+            if (config.performance && mark) {
+                startTag = "vue-perf-start:" + (vm._uid);
+                endTag = "vue-perf-end:" + (vm._uid);
+                mark(startTag);
+            }
+
+            // a flag to avoid this being observed
+            vm._isVue = true;
+            // merge options
+            if (options && options._isComponent) {
+                // optimize internal component instantiation
+                // since dynamic options merging is pretty slow, and none of the
+                // internal component options needs special treatment.
+                initInternalComponent(vm, options);
+            } else {
+                vm.$options = mergeOptions(
+                    resolveConstructorOptions(vm.constructor),
+                    options || {},
+                    vm
+                );
+            }
+            /* istanbul ignore else */
+            {
+                initProxy(vm);
+            }
+            // expose real self
+            vm._self = vm;
+            initLifecycle(vm);
+            initEvents(vm);
+            initRender(vm);
+            callHook(vm, 'beforeCreate');
+            initInjections(vm); // resolve injections before data/props
+            initState(vm);
+            initProvide(vm); // resolve provide after data/props
+            callHook(vm, 'created');
+
+            /* istanbul ignore if */
+            if (config.performance && mark) {
+                vm._name = formatComponentName(vm, false);
+                mark(endTag);
+                measure(("vue " + (vm._name) + " init"), startTag, endTag);
+            }
+
+            if (vm.$options.el) {
+                vm.$mount(vm.$options.el);
+            }
+        };
+    }
+
+    function initInternalComponent (vm, options) {
+        var opts = vm.$options = Object.create(vm.constructor.options);
+        // doing this because it's faster than dynamic enumeration.
+        var parentVnode = options._parentVnode;
+        opts.parent = options.parent;
+        opts._parentVnode = parentVnode;
+
+        var vnodeComponentOptions = parentVnode.componentOptions;
+        opts.propsData = vnodeComponentOptions.propsData;
+        opts._parentListeners = vnodeComponentOptions.listeners;
+        opts._renderChildren = vnodeComponentOptions.children;
+        opts._componentTag = vnodeComponentOptions.tag;
+
+        if (options.render) {
+            opts.render = options.render;
+            opts.staticRenderFns = options.staticRenderFns;
+        }
+    }
+
+    function resolveConstructorOptions (Ctor) {
+        var options = Ctor.options;
+        if (Ctor.super) {
+            var superOptions = resolveConstructorOptions(Ctor.super);
+            var cachedSuperOptions = Ctor.superOptions;
+            if (superOptions !== cachedSuperOptions) {
+                // super option changed,
+                // need to resolve new options.
+                Ctor.superOptions = superOptions;
+                // check if there are any late-modified/attached options (#4976)
+                var modifiedOptions = resolveModifiedOptions(Ctor);
+                // update base extend options
+                if (modifiedOptions) {
+                    extend(Ctor.extendOptions, modifiedOptions);
+                }
+                options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
+                if (options.name) {
+                    options.components[options.name] = Ctor;
+                }
+            }
+        }
+        return options
+    }
+
+    function resolveModifiedOptions (Ctor) {
+        var modified;
+        var latest = Ctor.options;
+        var sealed = Ctor.sealedOptions;
+        for (var key in latest) {
+            if (latest[key] !== sealed[key]) {
+                if (!modified) { modified = {}; }
+                modified[key] = latest[key];
+            }
+        }
+        return modified
+    }
+
+    function Vue (options) {
+        if (!(this instanceof Vue)
+        ) {
+            warn('Vue is a constructor and should be called with the `new` keyword');
+        }
+        this._init(options);
+    }
+
+    initMixin(Vue);
+    stateMixin(Vue);
+    eventsMixin(Vue);
+    lifecycleMixin(Vue);
+    renderMixin(Vue);
+
+    /*  */
+
+    function initUse (Vue) {
+        Vue.use = function (plugin) {
+            var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
+            if (installedPlugins.indexOf(plugin) > -1) {
+                return this
+            }
+
+            // additional parameters
+            var args = toArray(arguments, 1);
+            args.unshift(this);
+            if (typeof plugin.install === 'function') {
+                plugin.install.apply(plugin, args);
+            } else if (typeof plugin === 'function') {
+                plugin.apply(null, args);
+            }
+            installedPlugins.push(plugin);
+            return this
+        };
+    }
+
+    /*  */
+
+    function initMixin$1 (Vue) {
+        Vue.mixin = function (mixin) {
+            this.options = mergeOptions(this.options, mixin);
+            return this
+        };
+    }
+
+    /*  */
+
+    function initExtend (Vue) {
+        /**
+         * Each instance constructor, including Vue, has a unique
+         * cid. This enables us to create wrapped "child
+         * constructors" for prototypal inheritance and cache them.
+         */
+        Vue.cid = 0;
+        var cid = 1;
+
+        /**
+         * Class inheritance
+         */
+        Vue.extend = function (extendOptions) {
+            extendOptions = extendOptions || {};
+            var Super = this;
+            var SuperId = Super.cid;
+            var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
+            if (cachedCtors[SuperId]) {
+                return cachedCtors[SuperId]
+            }
+
+            var name = extendOptions.name || Super.options.name;
+            if (name) {
+                validateComponentName(name);
+            }
+
+            var Sub = function VueComponent (options) {
+                this._init(options);
+            };
+            Sub.prototype = Object.create(Super.prototype);
+            Sub.prototype.constructor = Sub;
+            Sub.cid = cid++;
+            Sub.options = mergeOptions(
+                Super.options,
+                extendOptions
+            );
+            Sub['super'] = Super;
+
+            // For props and computed properties, we define the proxy getters on
+            // the Vue instances at extension time, on the extended prototype. This
+            // avoids Object.defineProperty calls for each instance created.
+            if (Sub.options.props) {
+                initProps$1(Sub);
+            }
+            if (Sub.options.computed) {
+                initComputed$1(Sub);
+            }
+
+            // allow further extension/mixin/plugin usage
+            Sub.extend = Super.extend;
+            Sub.mixin = Super.mixin;
+            Sub.use = Super.use;
+
+            // create asset registers, so extended classes
+            // can have their private assets too.
+            ASSET_TYPES.forEach(function (type) {
+                Sub[type] = Super[type];
+            });
+            // enable recursive self-lookup
+            if (name) {
+                Sub.options.components[name] = Sub;
+            }
+
+            // keep a reference to the super options at extension time.
+            // later at instantiation we can check if Super's options have
+            // been updated.
+            Sub.superOptions = Super.options;
+            Sub.extendOptions = extendOptions;
+            Sub.sealedOptions = extend({}, Sub.options);
+
+            // cache constructor
+            cachedCtors[SuperId] = Sub;
+            return Sub
+        };
+    }
+
+    function initProps$1 (Comp) {
+        var props = Comp.options.props;
+        for (var key in props) {
+            proxy(Comp.prototype, "_props", key);
+        }
+    }
+
+    function initComputed$1 (Comp) {
+        var computed = Comp.options.computed;
+        for (var key in computed) {
+            defineComputed(Comp.prototype, key, computed[key]);
+        }
+    }
+
+    /*  */
+
+    function initAssetRegisters (Vue) {
+        /**
+         * Create asset registration methods.
+         */
+        ASSET_TYPES.forEach(function (type) {
+            Vue[type] = function (
+                id,
+                definition
+            ) {
+                if (!definition) {
+                    return this.options[type + 's'][id]
+                } else {
+                    /* istanbul ignore if */
+                    if (type === 'component') {
+                        validateComponentName(id);
+                    }
+                    if (type === 'component' && isPlainObject(definition)) {
+                        definition.name = definition.name || id;
+                        definition = this.options._base.extend(definition);
+                    }
+                    if (type === 'directive' && typeof definition === 'function') {
+                        definition = { bind: definition, update: definition };
+                    }
+                    this.options[type + 's'][id] = definition;
+                    return definition
+                }
+            };
+        });
+    }
+
+    /*  */
+
+
+
+
+
+    function getComponentName (opts) {
+        return opts && (opts.Ctor.options.name || opts.tag)
+    }
+
+    function matches (pattern, name) {
+        if (Array.isArray(pattern)) {
+            return pattern.indexOf(name) > -1
+        } else if (typeof pattern === 'string') {
+            return pattern.split(',').indexOf(name) > -1
+        } else if (isRegExp(pattern)) {
+            return pattern.test(name)
+        }
+        /* istanbul ignore next */
+        return false
+    }
+
+    function pruneCache (keepAliveInstance, filter) {
+        var cache = keepAliveInstance.cache;
+        var keys = keepAliveInstance.keys;
+        var _vnode = keepAliveInstance._vnode;
+        for (var key in cache) {
+            var entry = cache[key];
+            if (entry) {
+                var name = entry.name;
+                if (name && !filter(name)) {
+                    pruneCacheEntry(cache, key, keys, _vnode);
+                }
+            }
+        }
+    }
+
+    function pruneCacheEntry (
+        cache,
+        key,
+        keys,
+        current
+    ) {
+        var entry = cache[key];
+        if (entry && (!current || entry.tag !== current.tag)) {
+            entry.componentInstance.$destroy();
+        }
+        cache[key] = null;
+        remove(keys, key);
+    }
+
+    var patternTypes = [String, RegExp, Array];
+
+    var KeepAlive = {
+        name: 'keep-alive',
+        abstract: true,
+
+        props: {
+            include: patternTypes,
+            exclude: patternTypes,
+            max: [String, Number]
+        },
+
+        methods: {
+            cacheVNode: function cacheVNode() {
+                var ref = this;
+                var cache = ref.cache;
+                var keys = ref.keys;
+                var vnodeToCache = ref.vnodeToCache;
+                var keyToCache = ref.keyToCache;
+                if (vnodeToCache) {
+                    var tag = vnodeToCache.tag;
+                    var componentInstance = vnodeToCache.componentInstance;
+                    var componentOptions = vnodeToCache.componentOptions;
+                    cache[keyToCache] = {
+                        name: getComponentName(componentOptions),
+                        tag: tag,
+                        componentInstance: componentInstance,
+                    };
+                    keys.push(keyToCache);
+                    // prune oldest entry
+                    if (this.max && keys.length > parseInt(this.max)) {
+                        pruneCacheEntry(cache, keys[0], keys, this._vnode);
+                    }
+                    this.vnodeToCache = null;
+                }
+            }
+        },
+
+        created: function created () {
+            this.cache = Object.create(null);
+            this.keys = [];
+        },
+
+        destroyed: function destroyed () {
+            for (var key in this.cache) {
+                pruneCacheEntry(this.cache, key, this.keys);
+            }
+        },
+
+        mounted: function mounted () {
+            var this$1 = this;
+
+            this.cacheVNode();
+            this.$watch('include', function (val) {
+                pruneCache(this$1, function (name) { return matches(val, name); });
+            });
+            this.$watch('exclude', function (val) {
+                pruneCache(this$1, function (name) { return !matches(val, name); });
+            });
+        },
+
+        updated: function updated () {
+            this.cacheVNode();
+        },
+
+        render: function render () {
+            var slot = this.$slots.default;
+            var vnode = getFirstComponentChild(slot);
+            var componentOptions = vnode && vnode.componentOptions;
+            if (componentOptions) {
+                // check pattern
+                var name = getComponentName(componentOptions);
+                var ref = this;
+                var include = ref.include;
+                var exclude = ref.exclude;
+                if (
+                    // not included
+                    (include && (!name || !matches(include, name))) ||
+                    // excluded
+                    (exclude && name && matches(exclude, name))
+                ) {
+                    return vnode
+                }
+
+                var ref$1 = this;
+                var cache = ref$1.cache;
+                var keys = ref$1.keys;
+                var key = vnode.key == null
+                    // same constructor may get registered as different local components
+                    // so cid alone is not enough (#3269)
+                    ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
+                    : vnode.key;
+                if (cache[key]) {
+                    vnode.componentInstance = cache[key].componentInstance;
+                    // make current key freshest
+                    remove(keys, key);
+                    keys.push(key);
+                } else {
+                    // delay setting the cache until update
+                    this.vnodeToCache = vnode;
+                    this.keyToCache = key;
+                }
+
+                vnode.data.keepAlive = true;
+            }
+            return vnode || (slot && slot[0])
+        }
+    };
+
+    var builtInComponents = {
+        KeepAlive: KeepAlive
+    };
+
+    /*  */
+
+    function initGlobalAPI (Vue) {
+        // config
+        var configDef = {};
+        configDef.get = function () { return config; };
+        {
+            configDef.set = function () {
+                warn(
+                    'Do not replace the Vue.config object, set individual fields instead.'
+                );
+            };
+        }
+        Object.defineProperty(Vue, 'config', configDef);
+
+        // exposed util methods.
+        // NOTE: these are not considered part of the public API - avoid relying on
+        // them unless you are aware of the risk.
+        Vue.util = {
+            warn: warn,
+            extend: extend,
+            mergeOptions: mergeOptions,
+            defineReactive: defineReactive$$1
+        };
+
+        Vue.set = set;
+        Vue.delete = del;
+        Vue.nextTick = nextTick;
+
+        // 2.6 explicit observable API
+        Vue.observable = function (obj) {
+            observe(obj);
+            return obj
+        };
+
+        Vue.options = Object.create(null);
+        ASSET_TYPES.forEach(function (type) {
+            Vue.options[type + 's'] = Object.create(null);
+        });
+
+        // this is used to identify the "base" constructor to extend all plain-object
+        // components with in Weex's multi-instance scenarios.
+        Vue.options._base = Vue;
+
+        extend(Vue.options.components, builtInComponents);
+
+        initUse(Vue);
+        initMixin$1(Vue);
+        initExtend(Vue);
+        initAssetRegisters(Vue);
+    }
+
+    initGlobalAPI(Vue);
+
+    Object.defineProperty(Vue.prototype, '$isServer', {
+        get: isServerRendering
+    });
+
+    Object.defineProperty(Vue.prototype, '$ssrContext', {
+        get: function get () {
+            /* istanbul ignore next */
+            return this.$vnode && this.$vnode.ssrContext
+        }
+    });
+
+    // expose FunctionalRenderContext for ssr runtime helper installation
+    Object.defineProperty(Vue, 'FunctionalRenderContext', {
+        value: FunctionalRenderContext
+    });
+
+    Vue.version = '2.6.14';
+
+    /*  */
+
+    // these are reserved for web because they are directly compiled away
+    // during template compilation
+    var isReservedAttr = makeMap('style,class');
+
+    // attributes that should be using props for binding
+    var acceptValue = makeMap('input,textarea,option,select,progress');
+    var mustUseProp = function (tag, type, attr) {
+        return (
+            (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
+            (attr === 'selected' && tag === 'option') ||
+            (attr === 'checked' && tag === 'input') ||
+            (attr === 'muted' && tag === 'video')
+        )
+    };
+
+    var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');
+
+    var isValidContentEditableValue = makeMap('events,caret,typing,plaintext-only');
+
+    var convertEnumeratedValue = function (key, value) {
+        return isFalsyAttrValue(value) || value === 'false'
+            ? 'false'
+            // allow arbitrary string value for contenteditable
+            : key === 'contenteditable' && isValidContentEditableValue(value)
+                ? value
+                : 'true'
+    };
+
+    var isBooleanAttr = makeMap(
+        'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
+        'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
+        'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
+        'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
+        'required,reversed,scoped,seamless,selected,sortable,' +
+        'truespeed,typemustmatch,visible'
+    );
+
+    var xlinkNS = 'http://www.w3.org/1999/xlink';
+
+    var isXlink = function (name) {
+        return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
+    };
+
+    var getXlinkProp = function (name) {
+        return isXlink(name) ? name.slice(6, name.length) : ''
+    };
+
+    var isFalsyAttrValue = function (val) {
+        return val == null || val === false
+    };
+
+    /*  */
+
+    function genClassForVnode (vnode) {
+        var data = vnode.data;
+        var parentNode = vnode;
+        var childNode = vnode;
+        while (isDef(childNode.componentInstance)) {
+            childNode = childNode.componentInstance._vnode;
+            if (childNode && childNode.data) {
+                data = mergeClassData(childNode.data, data);
+            }
+        }
+        while (isDef(parentNode = parentNode.parent)) {
+            if (parentNode && parentNode.data) {
+                data = mergeClassData(data, parentNode.data);
+            }
+        }
+        return renderClass(data.staticClass, data.class)
+    }
+
+    function mergeClassData (child, parent) {
+        return {
+            staticClass: concat(child.staticClass, parent.staticClass),
+            class: isDef(child.class)
+                ? [child.class, parent.class]
+                : parent.class
+        }
+    }
+
+    function renderClass (
+        staticClass,
+        dynamicClass
+    ) {
+        if (isDef(staticClass) || isDef(dynamicClass)) {
+            return concat(staticClass, stringifyClass(dynamicClass))
+        }
+        /* istanbul ignore next */
+        return ''
+    }
+
+    function concat (a, b) {
+        return a ? b ? (a + ' ' + b) : a : (b || '')
+    }
+
+    function stringifyClass (value) {
+        if (Array.isArray(value)) {
+            return stringifyArray(value)
+        }
+        if (isObject(value)) {
+            return stringifyObject(value)
+        }
+        if (typeof value === 'string') {
+            return value
+        }
+        /* istanbul ignore next */
+        return ''
+    }
+
+    function stringifyArray (value) {
+        var res = '';
+        var stringified;
+        for (var i = 0, l = value.length; i < l; i++) {
+            if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
+                if (res) { res += ' '; }
+                res += stringified;
+            }
+        }
+        return res
+    }
+
+    function stringifyObject (value) {
+        var res = '';
+        for (var key in value) {
+            if (value[key]) {
+                if (res) { res += ' '; }
+                res += key;
+            }
+        }
+        return res
+    }
+
+    /*  */
+
+    var namespaceMap = {
+        svg: 'http://www.w3.org/2000/svg',
+        math: 'http://www.w3.org/1998/Math/MathML'
+    };
+
+    var isHTMLTag = makeMap(
+        'html,body,base,head,link,meta,style,title,' +
+        'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
+        'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
+        'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
+        's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
+        'embed,object,param,source,canvas,script,noscript,del,ins,' +
+        'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
+        'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
+        'output,progress,select,textarea,' +
+        'details,dialog,menu,menuitem,summary,' +
+        'content,element,shadow,template,blockquote,iframe,tfoot'
+    );
+
+    // this map is intentionally selective, only covering SVG elements that may
+    // contain child elements.
+    var isSVG = makeMap(
+        'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
+        'foreignobject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
+        'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
+        true
+    );
+
+    var isPreTag = function (tag) { return tag === 'pre'; };
+
+    var isReservedTag = function (tag) {
+        return isHTMLTag(tag) || isSVG(tag)
+    };
+
+    function getTagNamespace (tag) {
+        if (isSVG(tag)) {
+            return 'svg'
+        }
+        // basic support for MathML
+        // note it doesn't support other MathML elements being component roots
+        if (tag === 'math') {
+            return 'math'
+        }
+    }
+
+    var unknownElementCache = Object.create(null);
+    function isUnknownElement (tag) {
+        /* istanbul ignore if */
+        if (!inBrowser) {
+            return true
+        }
+        if (isReservedTag(tag)) {
+            return false
+        }
+        tag = tag.toLowerCase();
+        /* istanbul ignore if */
+        if (unknownElementCache[tag] != null) {
+            return unknownElementCache[tag]
+        }
+        var el = document.createElement(tag);
+        if (tag.indexOf('-') > -1) {
+            // http://stackoverflow.com/a/28210364/1070244
+            return (unknownElementCache[tag] = (
+                el.constructor === window.HTMLUnknownElement ||
+                el.constructor === window.HTMLElement
+            ))
+        } else {
+            return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
+        }
+    }
+
+    var isTextInputType = makeMap('text,number,password,search,email,tel,url');
+
+    /*  */
+
+    /**
+     * Query an element selector if it's not an element already.
+     */
+    function query (el) {
+        if (typeof el === 'string') {
+            var selected = document.querySelector(el);
+            if (!selected) {
+                warn(
+                    'Cannot find element: ' + el
+                );
+                return document.createElement('div')
+            }
+            return selected
+        } else {
+            return el
+        }
+    }
+
+    /*  */
+
+    function createElement$1 (tagName, vnode) {
+        var elm = document.createElement(tagName);
+        if (tagName !== 'select') {
+            return elm
+        }
+        // false or null will remove the attribute but undefined will not
+        if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
+            elm.setAttribute('multiple', 'multiple');
+        }
+        return elm
+    }
+
+    function createElementNS (namespace, tagName) {
+        return document.createElementNS(namespaceMap[namespace], tagName)
+    }
+
+    function createTextNode (text) {
+        return document.createTextNode(text)
+    }
+
+    function createComment (text) {
+        return document.createComment(text)
+    }
+
+    function insertBefore (parentNode, newNode, referenceNode) {
+        parentNode.insertBefore(newNode, referenceNode);
+    }
+
+    function removeChild (node, child) {
+        node.removeChild(child);
+    }
+
+    function appendChild (node, child) {
+        node.appendChild(child);
+    }
+
+    function parentNode (node) {
+        return node.parentNode
+    }
+
+    function nextSibling (node) {
+        return node.nextSibling
+    }
+
+    function tagName (node) {
+        return node.tagName
+    }
+
+    function setTextContent (node, text) {
+        node.textContent = text;
+    }
+
+    function setStyleScope (node, scopeId) {
+        node.setAttribute(scopeId, '');
+    }
+
+    var nodeOps = /*#__PURE__*/Object.freeze({
+        createElement: createElement$1,
+        createElementNS: createElementNS,
+        createTextNode: createTextNode,
+        createComment: createComment,
+        insertBefore: insertBefore,
+        removeChild: removeChild,
+        appendChild: appendChild,
+        parentNode: parentNode,
+        nextSibling: nextSibling,
+        tagName: tagName,
+        setTextContent: setTextContent,
+        setStyleScope: setStyleScope
+    });
+
+    /*  */
+
+    var ref = {
+        create: function create (_, vnode) {
+            registerRef(vnode);
+        },
+        update: function update (oldVnode, vnode) {
+            if (oldVnode.data.ref !== vnode.data.ref) {
+                registerRef(oldVnode, true);
+                registerRef(vnode);
+            }
+        },
+        destroy: function destroy (vnode) {
+            registerRef(vnode, true);
+        }
+    };
+
+    function registerRef (vnode, isRemoval) {
+        var key = vnode.data.ref;
+        if (!isDef(key)) { return }
+
+        var vm = vnode.context;
+        var ref = vnode.componentInstance || vnode.elm;
+        var refs = vm.$refs;
+        if (isRemoval) {
+            if (Array.isArray(refs[key])) {
+                remove(refs[key], ref);
+            } else if (refs[key] === ref) {
+                refs[key] = undefined;
+            }
+        } else {
+            if (vnode.data.refInFor) {
+                if (!Array.isArray(refs[key])) {
+                    refs[key] = [ref];
+                } else if (refs[key].indexOf(ref) < 0) {
+                    // $flow-disable-line
+                    refs[key].push(ref);
+                }
+            } else {
+                refs[key] = ref;
+            }
+        }
+    }
+
+    /**
+     * Virtual DOM patching algorithm based on Snabbdom by
+     * Simon Friis Vindum (@paldepind)
+     * Licensed under the MIT License
+     * https://github.com/paldepind/snabbdom/blob/master/LICENSE
+     *
+     * modified by Evan You (@yyx990803)
+     *
+     * Not type-checking this because this file is perf-critical and the cost
+     * of making flow understand it is not worth it.
+     */
+
+    var emptyNode = new VNode('', {}, []);
+
+    var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];
+
+    function sameVnode (a, b) {
+        return (
+            a.key === b.key &&
+            a.asyncFactory === b.asyncFactory && (
+                (
+                    a.tag === b.tag &&
+                    a.isComment === b.isComment &&
+                    isDef(a.data) === isDef(b.data) &&
+                    sameInputType(a, b)
+                ) || (
+                    isTrue(a.isAsyncPlaceholder) &&
+                    isUndef(b.asyncFactory.error)
+                )
+            )
+        )
+    }
+
+    function sameInputType (a, b) {
+        if (a.tag !== 'input') { return true }
+        var i;
+        var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
+        var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
+        return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
+    }
+
+    function createKeyToOldIdx (children, beginIdx, endIdx) {
+        var i, key;
+        var map = {};
+        for (i = beginIdx; i <= endIdx; ++i) {
+            key = children[i].key;
+            if (isDef(key)) { map[key] = i; }
+        }
+        return map
+    }
+
+    function createPatchFunction (backend) {
+        var i, j;
+        var cbs = {};
+
+        var modules = backend.modules;
+        var nodeOps = backend.nodeOps;
+
+        for (i = 0; i < hooks.length; ++i) {
+            cbs[hooks[i]] = [];
+            for (j = 0; j < modules.length; ++j) {
+                if (isDef(modules[j][hooks[i]])) {
+                    cbs[hooks[i]].push(modules[j][hooks[i]]);
+                }
+            }
+        }
+
+        function emptyNodeAt (elm) {
+            return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
+        }
+
+        function createRmCb (childElm, listeners) {
+            function remove$$1 () {
+                if (--remove$$1.listeners === 0) {
+                    removeNode(childElm);
+                }
+            }
+            remove$$1.listeners = listeners;
+            return remove$$1
+        }
+
+        function removeNode (el) {
+            var parent = nodeOps.parentNode(el);
+            // element may have already been removed due to v-html / v-text
+            if (isDef(parent)) {
+                nodeOps.removeChild(parent, el);
+            }
+        }
+
+        function isUnknownElement$$1 (vnode, inVPre) {
+            return (
+                !inVPre &&
+                !vnode.ns &&
+                !(
+                    config.ignoredElements.length &&
+                    config.ignoredElements.some(function (ignore) {
+                        return isRegExp(ignore)
+                            ? ignore.test(vnode.tag)
+                            : ignore === vnode.tag
+                    })
+                ) &&
+                config.isUnknownElement(vnode.tag)
+            )
+        }
+
+        var creatingElmInVPre = 0;
+
+        function createElm (
+            vnode,
+            insertedVnodeQueue,
+            parentElm,
+            refElm,
+            nested,
+            ownerArray,
+            index
+        ) {
+            if (isDef(vnode.elm) && isDef(ownerArray)) {
+                // This vnode was used in a previous render!
+                // now it's used as a new node, overwriting its elm would cause
+                // potential patch errors down the road when it's used as an insertion
+                // reference node. Instead, we clone the node on-demand before creating
+                // associated DOM element for it.
+                vnode = ownerArray[index] = cloneVNode(vnode);
+            }
+
+            vnode.isRootInsert = !nested; // for transition enter check
+            if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
+                return
+            }
+
+            var data = vnode.data;
+            var children = vnode.children;
+            var tag = vnode.tag;
+            if (isDef(tag)) {
+                {
+                    if (data && data.pre) {
+                        creatingElmInVPre++;
+                    }
+                    if (isUnknownElement$$1(vnode, creatingElmInVPre)) {
+                        warn(
+                            'Unknown custom element: <' + tag + '> - did you ' +
+                            'register the component correctly? For recursive components, ' +
+                            'make sure to provide the "name" option.',
+                            vnode.context
+                        );
+                    }
+                }
+
+                vnode.elm = vnode.ns
+                    ? nodeOps.createElementNS(vnode.ns, tag)
+                    : nodeOps.createElement(tag, vnode);
+                setScope(vnode);
+
+                /* istanbul ignore if */
+                {
+                    createChildren(vnode, children, insertedVnodeQueue);
+                    if (isDef(data)) {
+                        invokeCreateHooks(vnode, insertedVnodeQueue);
+                    }
+                    insert(parentElm, vnode.elm, refElm);
+                }
+
+                if (data && data.pre) {
+                    creatingElmInVPre--;
+                }
+            } else if (isTrue(vnode.isComment)) {
+                vnode.elm = nodeOps.createComment(vnode.text);
+                insert(parentElm, vnode.elm, refElm);
+            } else {
+                vnode.elm = nodeOps.createTextNode(vnode.text);
+                insert(parentElm, vnode.elm, refElm);
+            }
+        }
+
+        function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
+            var i = vnode.data;
+            if (isDef(i)) {
+                var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
+                if (isDef(i = i.hook) && isDef(i = i.init)) {
+                    i(vnode, false /* hydrating */);
+                }
+                // after calling the init hook, if the vnode is a child component
+                // it should've created a child instance and mounted it. the child
+                // component also has set the placeholder vnode's elm.
+                // in that case we can just return the element and be done.
+                if (isDef(vnode.componentInstance)) {
+                    initComponent(vnode, insertedVnodeQueue);
+                    insert(parentElm, vnode.elm, refElm);
+                    if (isTrue(isReactivated)) {
+                        reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
+                    }
+                    return true
+                }
+            }
+        }
+
+        function initComponent (vnode, insertedVnodeQueue) {
+            if (isDef(vnode.data.pendingInsert)) {
+                insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
+                vnode.data.pendingInsert = null;
+            }
+            vnode.elm = vnode.componentInstance.$el;
+            if (isPatchable(vnode)) {
+                invokeCreateHooks(vnode, insertedVnodeQueue);
+                setScope(vnode);
+            } else {
+                // empty component root.
+                // skip all element-related modules except for ref (#3455)
+                registerRef(vnode);
+                // make sure to invoke the insert hook
+                insertedVnodeQueue.push(vnode);
+            }
+        }
+
+        function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
+            var i;
+            // hack for #4339: a reactivated component with inner transition
+            // does not trigger because the inner node's created hooks are not called
+            // again. It's not ideal to involve module-specific logic in here but
+            // there doesn't seem to be a better way to do it.
+            var innerNode = vnode;
+            while (innerNode.componentInstance) {
+                innerNode = innerNode.componentInstance._vnode;
+                if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
+                    for (i = 0; i < cbs.activate.length; ++i) {
+                        cbs.activate[i](emptyNode, innerNode);
+                    }
+                    insertedVnodeQueue.push(innerNode);
+                    break
+                }
+            }
+            // unlike a newly created component,
+            // a reactivated keep-alive component doesn't insert itself
+            insert(parentElm, vnode.elm, refElm);
+        }
+
+        function insert (parent, elm, ref$$1) {
+            if (isDef(parent)) {
+                if (isDef(ref$$1)) {
+                    if (nodeOps.parentNode(ref$$1) === parent) {
+                        nodeOps.insertBefore(parent, elm, ref$$1);
+                    }
+                } else {
+                    nodeOps.appendChild(parent, elm);
+                }
+            }
+        }
+
+        function createChildren (vnode, children, insertedVnodeQueue) {
+            if (Array.isArray(children)) {
+                {
+                    checkDuplicateKeys(children);
+                }
+                for (var i = 0; i < children.length; ++i) {
+                    createElm(children[i], insertedVnodeQueue, vnode.elm, null, true, children, i);
+                }
+            } else if (isPrimitive(vnode.text)) {
+                nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(String(vnode.text)));
+            }
+        }
+
+        function isPatchable (vnode) {
+            while (vnode.componentInstance) {
+                vnode = vnode.componentInstance._vnode;
+            }
+            return isDef(vnode.tag)
+        }
+
+        function invokeCreateHooks (vnode, insertedVnodeQueue) {
+            for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
+                cbs.create[i$1](emptyNode, vnode);
+            }
+            i = vnode.data.hook; // Reuse variable
+            if (isDef(i)) {
+                if (isDef(i.create)) { i.create(emptyNode, vnode); }
+                if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }
+            }
+        }
+
+        // set scope id attribute for scoped CSS.
+        // this is implemented as a special case to avoid the overhead
+        // of going through the normal attribute patching process.
+        function setScope (vnode) {
+            var i;
+            if (isDef(i = vnode.fnScopeId)) {
+                nodeOps.setStyleScope(vnode.elm, i);
+            } else {
+                var ancestor = vnode;
+                while (ancestor) {
+                    if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
+                        nodeOps.setStyleScope(vnode.elm, i);
+                    }
+                    ancestor = ancestor.parent;
+                }
+            }
+            // for slot content they should also get the scopeId from the host instance.
+            if (isDef(i = activeInstance) &&
+                i !== vnode.context &&
+                i !== vnode.fnContext &&
+                isDef(i = i.$options._scopeId)
+            ) {
+                nodeOps.setStyleScope(vnode.elm, i);
+            }
+        }
+
+        function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
+            for (; startIdx <= endIdx; ++startIdx) {
+                createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm, false, vnodes, startIdx);
+            }
+        }
+
+        function invokeDestroyHook (vnode) {
+            var i, j;
+            var data = vnode.data;
+            if (isDef(data)) {
+                if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
+                for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
+            }
+            if (isDef(i = vnode.children)) {
+                for (j = 0; j < vnode.children.length; ++j) {
+                    invokeDestroyHook(vnode.children[j]);
+                }
+            }
+        }
+
+        function removeVnodes (vnodes, startIdx, endIdx) {
+            for (; startIdx <= endIdx; ++startIdx) {
+                var ch = vnodes[startIdx];
+                if (isDef(ch)) {
+                    if (isDef(ch.tag)) {
+                        removeAndInvokeRemoveHook(ch);
+                        invokeDestroyHook(ch);
+                    } else { // Text node
+                        removeNode(ch.elm);
+                    }
+                }
+            }
+        }
+
+        function removeAndInvokeRemoveHook (vnode, rm) {
+            if (isDef(rm) || isDef(vnode.data)) {
+                var i;
+                var listeners = cbs.remove.length + 1;
+                if (isDef(rm)) {
+                    // we have a recursively passed down rm callback
+                    // increase the listeners count
+                    rm.listeners += listeners;
+                } else {
+                    // directly removing
+                    rm = createRmCb(vnode.elm, listeners);
+                }
+                // recursively invoke hooks on child component root node
+                if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
+                    removeAndInvokeRemoveHook(i, rm);
+                }
+                for (i = 0; i < cbs.remove.length; ++i) {
+                    cbs.remove[i](vnode, rm);
+                }
+                if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
+                    i(vnode, rm);
+                } else {
+                    rm();
+                }
+            } else {
+                removeNode(vnode.elm);
+            }
+        }
+
+        function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
+            var oldStartIdx = 0;
+            var newStartIdx = 0;
+            var oldEndIdx = oldCh.length - 1;
+            var oldStartVnode = oldCh[0];
+            var oldEndVnode = oldCh[oldEndIdx];
+            var newEndIdx = newCh.length - 1;
+            var newStartVnode = newCh[0];
+            var newEndVnode = newCh[newEndIdx];
+            var oldKeyToIdx, idxInOld, vnodeToMove, refElm;
+
+            // removeOnly is a special flag used only by <transition-group>
+            // to ensure removed elements stay in correct relative positions
+            // during leaving transitions
+            var canMove = !removeOnly;
+
+            {
+                checkDuplicateKeys(newCh);
+            }
+
+            while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
+                if (isUndef(oldStartVnode)) {
+                    oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
+                } else if (isUndef(oldEndVnode)) {
+                    oldEndVnode = oldCh[--oldEndIdx];
+                } else if (sameVnode(oldStartVnode, newStartVnode)) {
+                    patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
+                    oldStartVnode = oldCh[++oldStartIdx];
+                    newStartVnode = newCh[++newStartIdx];
+                } else if (sameVnode(oldEndVnode, newEndVnode)) {
+                    patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
+                    oldEndVnode = oldCh[--oldEndIdx];
+                    newEndVnode = newCh[--newEndIdx];
+                } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
+                    patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
+                    canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
+                    oldStartVnode = oldCh[++oldStartIdx];
+                    newEndVnode = newCh[--newEndIdx];
+                } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
+                    patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
+                    canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
+                    oldEndVnode = oldCh[--oldEndIdx];
+                    newStartVnode = newCh[++newStartIdx];
+                } else {
+                    if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
+                    idxInOld = isDef(newStartVnode.key)
+                        ? oldKeyToIdx[newStartVnode.key]
+                        : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
+                    if (isUndef(idxInOld)) { // New element
+                        createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
+                    } else {
+                        vnodeToMove = oldCh[idxInOld];
+                        if (sameVnode(vnodeToMove, newStartVnode)) {
+                            patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
+                            oldCh[idxInOld] = undefined;
+                            canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
+                        } else {
+                            // same key but different element. treat as new element
+                            createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
+                        }
+                    }
+                    newStartVnode = newCh[++newStartIdx];
+                }
+            }
+            if (oldStartIdx > oldEndIdx) {
+                refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
+                addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
+            } else if (newStartIdx > newEndIdx) {
+                removeVnodes(oldCh, oldStartIdx, oldEndIdx);
+            }
+        }
+
+        function checkDuplicateKeys (children) {
+            var seenKeys = {};
+            for (var i = 0; i < children.length; i++) {
+                var vnode = children[i];
+                var key = vnode.key;
+                if (isDef(key)) {
+                    if (seenKeys[key]) {
+                        warn(
+                            ("Duplicate keys detected: '" + key + "'. This may cause an update error."),
+                            vnode.context
+                        );
+                    } else {
+                        seenKeys[key] = true;
+                    }
+                }
+            }
+        }
+
+        function findIdxInOld (node, oldCh, start, end) {
+            for (var i = start; i < end; i++) {
+                var c = oldCh[i];
+                if (isDef(c) && sameVnode(node, c)) { return i }
+            }
+        }
+
+        function patchVnode (
+            oldVnode,
+            vnode,
+            insertedVnodeQueue,
+            ownerArray,
+            index,
+            removeOnly
+        ) {
+            if (oldVnode === vnode) {
+                return
+            }
+
+            if (isDef(vnode.elm) && isDef(ownerArray)) {
+                // clone reused vnode
+                vnode = ownerArray[index] = cloneVNode(vnode);
+            }
+
+            var elm = vnode.elm = oldVnode.elm;
+
+            if (isTrue(oldVnode.isAsyncPlaceholder)) {
+                if (isDef(vnode.asyncFactory.resolved)) {
+                    hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
+                } else {
+                    vnode.isAsyncPlaceholder = true;
+                }
+                return
+            }
+
+            // reuse element for static trees.
+            // note we only do this if the vnode is cloned -
+            // if the new node is not cloned it means the render functions have been
+            // reset by the hot-reload-api and we need to do a proper re-render.
+            if (isTrue(vnode.isStatic) &&
+                isTrue(oldVnode.isStatic) &&
+                vnode.key === oldVnode.key &&
+                (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
+            ) {
+                vnode.componentInstance = oldVnode.componentInstance;
+                return
+            }
+
+            var i;
+            var data = vnode.data;
+            if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
+                i(oldVnode, vnode);
+            }
+
+            var oldCh = oldVnode.children;
+            var ch = vnode.children;
+            if (isDef(data) && isPatchable(vnode)) {
+                for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
+                if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
+            }
+            if (isUndef(vnode.text)) {
+                if (isDef(oldCh) && isDef(ch)) {
+                    if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
+                } else if (isDef(ch)) {
+                    {
+                        checkDuplicateKeys(ch);
+                    }
+                    if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
+                    addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
+                } else if (isDef(oldCh)) {
+                    removeVnodes(oldCh, 0, oldCh.length - 1);
+                } else if (isDef(oldVnode.text)) {
+                    nodeOps.setTextContent(elm, '');
+                }
+            } else if (oldVnode.text !== vnode.text) {
+                nodeOps.setTextContent(elm, vnode.text);
+            }
+            if (isDef(data)) {
+                if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
+            }
+        }
+
+        function invokeInsertHook (vnode, queue, initial) {
+            // delay insert hooks for component root nodes, invoke them after the
+            // element is really inserted
+            if (isTrue(initial) && isDef(vnode.parent)) {
+                vnode.parent.data.pendingInsert = queue;
+            } else {
+                for (var i = 0; i < queue.length; ++i) {
+                    queue[i].data.hook.insert(queue[i]);
+                }
+            }
+        }
+
+        var hydrationBailed = false;
+        // list of modules that can skip create hook during hydration because they
+        // are already rendered on the client or has no need for initialization
+        // Note: style is excluded because it relies on initial clone for future
+        // deep updates (#7063).
+        var isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key');
+
+        // Note: this is a browser-only function so we can assume elms are DOM nodes.
+        function hydrate (elm, vnode, insertedVnodeQueue, inVPre) {
+            var i;
+            var tag = vnode.tag;
+            var data = vnode.data;
+            var children = vnode.children;
+            inVPre = inVPre || (data && data.pre);
+            vnode.elm = elm;
+
+            if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
+                vnode.isAsyncPlaceholder = true;
+                return true
+            }
+            // assert node match
+            {
+                if (!assertNodeMatch(elm, vnode, inVPre)) {
+                    return false
+                }
+            }
+            if (isDef(data)) {
+                if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
+                if (isDef(i = vnode.componentInstance)) {
+                    // child component. it should have hydrated its own tree.
+                    initComponent(vnode, insertedVnodeQueue);
+                    return true
+                }
+            }
+            if (isDef(tag)) {
+                if (isDef(children)) {
+                    // empty element, allow client to pick up and populate children
+                    if (!elm.hasChildNodes()) {
+                        createChildren(vnode, children, insertedVnodeQueue);
+                    } else {
+                        // v-html and domProps: innerHTML
+                        if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
+                            if (i !== elm.innerHTML) {
+                                /* istanbul ignore if */
+                                if (typeof console !== 'undefined' &&
+                                    !hydrationBailed
+                                ) {
+                                    hydrationBailed = true;
+                                    console.warn('Parent: ', elm);
+                                    console.warn('server innerHTML: ', i);
+                                    console.warn('client innerHTML: ', elm.innerHTML);
+                                }
+                                return false
+                            }
+                        } else {
+                            // iterate and compare children lists
+                            var childrenMatch = true;
+                            var childNode = elm.firstChild;
+                            for (var i$1 = 0; i$1 < children.length; i$1++) {
+                                if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue, inVPre)) {
+                                    childrenMatch = false;
+                                    break
+                                }
+                                childNode = childNode.nextSibling;
+                            }
+                            // if childNode is not null, it means the actual childNodes list is
+                            // longer than the virtual children list.
+                            if (!childrenMatch || childNode) {
+                                /* istanbul ignore if */
+                                if (typeof console !== 'undefined' &&
+                                    !hydrationBailed
+                                ) {
+                                    hydrationBailed = true;
+                                    console.warn('Parent: ', elm);
+                                    console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
+                                }
+                                return false
+                            }
+                        }
+                    }
+                }
+                if (isDef(data)) {
+                    var fullInvoke = false;
+                    for (var key in data) {
+                        if (!isRenderedModule(key)) {
+                            fullInvoke = true;
+                            invokeCreateHooks(vnode, insertedVnodeQueue);
+                            break
+                        }
+                    }
+                    if (!fullInvoke && data['class']) {
+                        // ensure collecting deps for deep class bindings for future updates
+                        traverse(data['class']);
+                    }
+                }
+            } else if (elm.data !== vnode.text) {
+                elm.data = vnode.text;
+            }
+            return true
+        }
+
+        function assertNodeMatch (node, vnode, inVPre) {
+            if (isDef(vnode.tag)) {
+                return vnode.tag.indexOf('vue-component') === 0 || (
+                    !isUnknownElement$$1(vnode, inVPre) &&
+                    vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
+                )
+            } else {
+                return node.nodeType === (vnode.isComment ? 8 : 3)
+            }
+        }
+
+        return function patch (oldVnode, vnode, hydrating, removeOnly) {
+            if (isUndef(vnode)) {
+                if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }
+                return
+            }
+
+            var isInitialPatch = false;
+            var insertedVnodeQueue = [];
+
+            if (isUndef(oldVnode)) {
+                // empty mount (likely as component), create new root element
+                isInitialPatch = true;
+                createElm(vnode, insertedVnodeQueue);
+            } else {
+                var isRealElement = isDef(oldVnode.nodeType);
+                if (!isRealElement && sameVnode(oldVnode, vnode)) {
+                    // patch existing root node
+                    patchVnode(oldVnode, vnode, insertedVnodeQueue, null, null, removeOnly);
+                } else {
+                    if (isRealElement) {
+                        // mounting to a real element
+                        // check if this is server-rendered content and if we can perform
+                        // a successful hydration.
+                        if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
+                            oldVnode.removeAttribute(SSR_ATTR);
+                            hydrating = true;
+                        }
+                        if (isTrue(hydrating)) {
+                            if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
+                                invokeInsertHook(vnode, insertedVnodeQueue, true);
+                                return oldVnode
+                            } else {
+                                warn(
+                                    'The client-side rendered virtual DOM tree is not matching ' +
+                                    'server-rendered content. This is likely caused by incorrect ' +
+                                    'HTML markup, for example nesting block-level elements inside ' +
+                                    '<p>, or missing <tbody>. Bailing hydration and performing ' +
+                                    'full client-side render.'
+                                );
+                            }
+                        }
+                        // either not server-rendered, or hydration failed.
+                        // create an empty node and replace it
+                        oldVnode = emptyNodeAt(oldVnode);
+                    }
+
+                    // replacing existing element
+                    var oldElm = oldVnode.elm;
+                    var parentElm = nodeOps.parentNode(oldElm);
+
+                    // create new node
+                    createElm(
+                        vnode,
+                        insertedVnodeQueue,
+                        // extremely rare edge case: do not insert if old element is in a
+                        // leaving transition. Only happens when combining transition +
+                        // keep-alive + HOCs. (#4590)
+                        oldElm._leaveCb ? null : parentElm,
+                        nodeOps.nextSibling(oldElm)
+                    );
+
+                    // update parent placeholder node element, recursively
+                    if (isDef(vnode.parent)) {
+                        var ancestor = vnode.parent;
+                        var patchable = isPatchable(vnode);
+                        while (ancestor) {
+                            for (var i = 0; i < cbs.destroy.length; ++i) {
+                                cbs.destroy[i](ancestor);
+                            }
+                            ancestor.elm = vnode.elm;
+                            if (patchable) {
+                                for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
+                                    cbs.create[i$1](emptyNode, ancestor);
+                                }
+                                // #6513
+                                // invoke insert hooks that may have been merged by create hooks.
+                                // e.g. for directives that uses the "inserted" hook.
+                                var insert = ancestor.data.hook.insert;
+                                if (insert.merged) {
+                                    // start at index 1 to avoid re-invoking component mounted hook
+                                    for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {
+                                        insert.fns[i$2]();
+                                    }
+                                }
+                            } else {
+                                registerRef(ancestor);
+                            }
+                            ancestor = ancestor.parent;
+                        }
+                    }
+
+                    // destroy old node
+                    if (isDef(parentElm)) {
+                        removeVnodes([oldVnode], 0, 0);
+                    } else if (isDef(oldVnode.tag)) {
+                        invokeDestroyHook(oldVnode);
+                    }
+                }
+            }
+
+            invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
+            return vnode.elm
+        }
+    }
+
+    /*  */
+
+    var directives = {
+        create: updateDirectives,
+        update: updateDirectives,
+        destroy: function unbindDirectives (vnode) {
+            updateDirectives(vnode, emptyNode);
+        }
+    };
+
+    function updateDirectives (oldVnode, vnode) {
+        if (oldVnode.data.directives || vnode.data.directives) {
+            _update(oldVnode, vnode);
+        }
+    }
+
+    function _update (oldVnode, vnode) {
+        var isCreate = oldVnode === emptyNode;
+        var isDestroy = vnode === emptyNode;
+        var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
+        var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);
+
+        var dirsWithInsert = [];
+        var dirsWithPostpatch = [];
+
+        var key, oldDir, dir;
+        for (key in newDirs) {
+            oldDir = oldDirs[key];
+            dir = newDirs[key];
+            if (!oldDir) {
+                // new directive, bind
+                callHook$1(dir, 'bind', vnode, oldVnode);
+                if (dir.def && dir.def.inserted) {
+                    dirsWithInsert.push(dir);
+                }
+            } else {
+                // existing directive, update
+                dir.oldValue = oldDir.value;
+                dir.oldArg = oldDir.arg;
+                callHook$1(dir, 'update', vnode, oldVnode);
+                if (dir.def && dir.def.componentUpdated) {
+                    dirsWithPostpatch.push(dir);
+                }
+            }
+        }
+
+        if (dirsWithInsert.length) {
+            var callInsert = function () {
+                for (var i = 0; i < dirsWithInsert.length; i++) {
+                    callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
+                }
+            };
+            if (isCreate) {
+                mergeVNodeHook(vnode, 'insert', callInsert);
+            } else {
+                callInsert();
+            }
+        }
+
+        if (dirsWithPostpatch.length) {
+            mergeVNodeHook(vnode, 'postpatch', function () {
+                for (var i = 0; i < dirsWithPostpatch.length; i++) {
+                    callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
+                }
+            });
+        }
+
+        if (!isCreate) {
+            for (key in oldDirs) {
+                if (!newDirs[key]) {
+                    // no longer present, unbind
+                    callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
+                }
+            }
+        }
+    }
+
+    var emptyModifiers = Object.create(null);
+
+    function normalizeDirectives$1 (
+        dirs,
+        vm
+    ) {
+        var res = Object.create(null);
+        if (!dirs) {
+            // $flow-disable-line
+            return res
+        }
+        var i, dir;
+        for (i = 0; i < dirs.length; i++) {
+            dir = dirs[i];
+            if (!dir.modifiers) {
+                // $flow-disable-line
+                dir.modifiers = emptyModifiers;
+            }
+            res[getRawDirName(dir)] = dir;
+            dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
+        }
+        // $flow-disable-line
+        return res
+    }
+
+    function getRawDirName (dir) {
+        return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
+    }
+
+    function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {
+        var fn = dir.def && dir.def[hook];
+        if (fn) {
+            try {
+                fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
+            } catch (e) {
+                handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
+            }
+        }
+    }
+
+    var baseModules = [
+        ref,
+        directives
+    ];
+
+    /*  */
+
+    function updateAttrs (oldVnode, vnode) {
+        var opts = vnode.componentOptions;
+        if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
+            return
+        }
+        if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
+            return
+        }
+        var key, cur, old;
+        var elm = vnode.elm;
+        var oldAttrs = oldVnode.data.attrs || {};
+        var attrs = vnode.data.attrs || {};
+        // clone observed objects, as the user probably wants to mutate it
+        if (isDef(attrs.__ob__)) {
+            attrs = vnode.data.attrs = extend({}, attrs);
+        }
+
+        for (key in attrs) {
+            cur = attrs[key];
+            old = oldAttrs[key];
+            if (old !== cur) {
+                setAttr(elm, key, cur, vnode.data.pre);
+            }
+        }
+        // #4391: in IE9, setting type can reset value for input[type=radio]
+        // #6666: IE/Edge forces progress value down to 1 before setting a max
+        /* istanbul ignore if */
+        if ((isIE || isEdge) && attrs.value !== oldAttrs.value) {
+            setAttr(elm, 'value', attrs.value);
+        }
+        for (key in oldAttrs) {
+            if (isUndef(attrs[key])) {
+                if (isXlink(key)) {
+                    elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
+                } else if (!isEnumeratedAttr(key)) {
+                    elm.removeAttribute(key);
+                }
+            }
+        }
+    }
+
+    function setAttr (el, key, value, isInPre) {
+        if (isInPre || el.tagName.indexOf('-') > -1) {
+            baseSetAttr(el, key, value);
+        } else if (isBooleanAttr(key)) {
+            // set attribute for blank value
+            // e.g. <option disabled>Select one</option>
+            if (isFalsyAttrValue(value)) {
+                el.removeAttribute(key);
+            } else {
+                // technically allowfullscreen is a boolean attribute for <iframe>,
+                // but Flash expects a value of "true" when used on <embed> tag
+                value = key === 'allowfullscreen' && el.tagName === 'EMBED'
+                    ? 'true'
+                    : key;
+                el.setAttribute(key, value);
+            }
+        } else if (isEnumeratedAttr(key)) {
+            el.setAttribute(key, convertEnumeratedValue(key, value));
+        } else if (isXlink(key)) {
+            if (isFalsyAttrValue(value)) {
+                el.removeAttributeNS(xlinkNS, getXlinkProp(key));
+            } else {
+                el.setAttributeNS(xlinkNS, key, value);
+            }
+        } else {
+            baseSetAttr(el, key, value);
+        }
+    }
+
+    function baseSetAttr (el, key, value) {
+        if (isFalsyAttrValue(value)) {
+            el.removeAttribute(key);
+        } else {
+            // #7138: IE10 & 11 fires input event when setting placeholder on
+            // <textarea>... block the first input event and remove the blocker
+            // immediately.
+            /* istanbul ignore if */
+            if (
+                isIE && !isIE9 &&
+                el.tagName === 'TEXTAREA' &&
+                key === 'placeholder' && value !== '' && !el.__ieph
+            ) {
+                var blocker = function (e) {
+                    e.stopImmediatePropagation();
+                    el.removeEventListener('input', blocker);
+                };
+                el.addEventListener('input', blocker);
+                // $flow-disable-line
+                el.__ieph = true; /* IE placeholder patched */
+            }
+            el.setAttribute(key, value);
+        }
+    }
+
+    var attrs = {
+        create: updateAttrs,
+        update: updateAttrs
+    };
+
+    /*  */
+
+    function updateClass (oldVnode, vnode) {
+        var el = vnode.elm;
+        var data = vnode.data;
+        var oldData = oldVnode.data;
+        if (
+            isUndef(data.staticClass) &&
+            isUndef(data.class) && (
+                isUndef(oldData) || (
+                    isUndef(oldData.staticClass) &&
+                    isUndef(oldData.class)
+                )
+            )
+        ) {
+            return
+        }
+
+        var cls = genClassForVnode(vnode);
+
+        // handle transition classes
+        var transitionClass = el._transitionClasses;
+        if (isDef(transitionClass)) {
+            cls = concat(cls, stringifyClass(transitionClass));
+        }
+
+        // set the class
+        if (cls !== el._prevClass) {
+            el.setAttribute('class', cls);
+            el._prevClass = cls;
+        }
+    }
+
+    var klass = {
+        create: updateClass,
+        update: updateClass
+    };
+
+    /*  */
+
+    var validDivisionCharRE = /[\w).+\-_$\]]/;
+
+    function parseFilters (exp) {
+        var inSingle = false;
+        var inDouble = false;
+        var inTemplateString = false;
+        var inRegex = false;
+        var curly = 0;
+        var square = 0;
+        var paren = 0;
+        var lastFilterIndex = 0;
+        var c, prev, i, expression, filters;
+
+        for (i = 0; i < exp.length; i++) {
+            prev = c;
+            c = exp.charCodeAt(i);
+            if (inSingle) {
+                if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
+            } else if (inDouble) {
+                if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
+            } else if (inTemplateString) {
+                if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
+            } else if (inRegex) {
+                if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
+            } else if (
+                c === 0x7C && // pipe
+                exp.charCodeAt(i + 1) !== 0x7C &&
+                exp.charCodeAt(i - 1) !== 0x7C &&
+                !curly && !square && !paren
+            ) {
+                if (expression === undefined) {
+                    // first filter, end of expression
+                    lastFilterIndex = i + 1;
+                    expression = exp.slice(0, i).trim();
+                } else {
+                    pushFilter();
+                }
+            } else {
+                switch (c) {
+                    case 0x22: inDouble = true; break         // "
+                    case 0x27: inSingle = true; break         // '
+                    case 0x60: inTemplateString = true; break // `
+                    case 0x28: paren++; break                 // (
+                    case 0x29: paren--; break                 // )
+                    case 0x5B: square++; break                // [
+                    case 0x5D: square--; break                // ]
+                    case 0x7B: curly++; break                 // {
+                    case 0x7D: curly--; break                 // }
+                }
+                if (c === 0x2f) { // /
+                    var j = i - 1;
+                    var p = (void 0);
+                    // find first non-whitespace prev char
+                    for (; j >= 0; j--) {
+                        p = exp.charAt(j);
+                        if (p !== ' ') { break }
+                    }
+                    if (!p || !validDivisionCharRE.test(p)) {
+                        inRegex = true;
+                    }
+                }
+            }
+        }
+
+        if (expression === undefined) {
+            expression = exp.slice(0, i).trim();
+        } else if (lastFilterIndex !== 0) {
+            pushFilter();
+        }
+
+        function pushFilter () {
+            (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
+            lastFilterIndex = i + 1;
+        }
+
+        if (filters) {
+            for (i = 0; i < filters.length; i++) {
+                expression = wrapFilter(expression, filters[i]);
+            }
+        }
+
+        return expression
+    }
+
+    function wrapFilter (exp, filter) {
+        var i = filter.indexOf('(');
+        if (i < 0) {
+            // _f: resolveFilter
+            return ("_f(\"" + filter + "\")(" + exp + ")")
+        } else {
+            var name = filter.slice(0, i);
+            var args = filter.slice(i + 1);
+            return ("_f(\"" + name + "\")(" + exp + (args !== ')' ? ',' + args : args))
+        }
+    }
+
+    /*  */
+
+
+
+    /* eslint-disable no-unused-vars */
+    function baseWarn (msg, range) {
+        console.error(("[Vue compiler]: " + msg));
+    }
+    /* eslint-enable no-unused-vars */
+
+    function pluckModuleFunction (
+        modules,
+        key
+    ) {
+        return modules
+            ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
+            : []
+    }
+
+    function addProp (el, name, value, range, dynamic) {
+        (el.props || (el.props = [])).push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
+        el.plain = false;
+    }
+
+    function addAttr (el, name, value, range, dynamic) {
+        var attrs = dynamic
+            ? (el.dynamicAttrs || (el.dynamicAttrs = []))
+            : (el.attrs || (el.attrs = []));
+        attrs.push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
+        el.plain = false;
+    }
+
+    // add a raw attr (use this in preTransforms)
+    function addRawAttr (el, name, value, range) {
+        el.attrsMap[name] = value;
+        el.attrsList.push(rangeSetItem({ name: name, value: value }, range));
+    }
+
+    function addDirective (
+        el,
+        name,
+        rawName,
+        value,
+        arg,
+        isDynamicArg,
+        modifiers,
+        range
+    ) {
+        (el.directives || (el.directives = [])).push(rangeSetItem({
+            name: name,
+            rawName: rawName,
+            value: value,
+            arg: arg,
+            isDynamicArg: isDynamicArg,
+            modifiers: modifiers
+        }, range));
+        el.plain = false;
+    }
+
+    function prependModifierMarker (symbol, name, dynamic) {
+        return dynamic
+            ? ("_p(" + name + ",\"" + symbol + "\")")
+            : symbol + name // mark the event as captured
+    }
+
+    function addHandler (
+        el,
+        name,
+        value,
+        modifiers,
+        important,
+        warn,
+        range,
+        dynamic
+    ) {
+        modifiers = modifiers || emptyObject;
+        // warn prevent and passive modifier
+        /* istanbul ignore if */
+        if (
+            warn &&
+            modifiers.prevent && modifiers.passive
+        ) {
+            warn(
+                'passive and prevent can\'t be used together. ' +
+                'Passive handler can\'t prevent default event.',
+                range
+            );
+        }
+
+        // normalize click.right and click.middle since they don't actually fire
+        // this is technically browser-specific, but at least for now browsers are
+        // the only target envs that have right/middle clicks.
+        if (modifiers.right) {
+            if (dynamic) {
+                name = "(" + name + ")==='click'?'contextmenu':(" + name + ")";
+            } else if (name === 'click') {
+                name = 'contextmenu';
+                delete modifiers.right;
+            }
+        } else if (modifiers.middle) {
+            if (dynamic) {
+                name = "(" + name + ")==='click'?'mouseup':(" + name + ")";
+            } else if (name === 'click') {
+                name = 'mouseup';
+            }
+        }
+
+        // check capture modifier
+        if (modifiers.capture) {
+            delete modifiers.capture;
+            name = prependModifierMarker('!', name, dynamic);
+        }
+        if (modifiers.once) {
+            delete modifiers.once;
+            name = prependModifierMarker('~', name, dynamic);
+        }
+        /* istanbul ignore if */
+        if (modifiers.passive) {
+            delete modifiers.passive;
+            name = prependModifierMarker('&', name, dynamic);
+        }
+
+        var events;
+        if (modifiers.native) {
+            delete modifiers.native;
+            events = el.nativeEvents || (el.nativeEvents = {});
+        } else {
+            events = el.events || (el.events = {});
+        }
+
+        var newHandler = rangeSetItem({ value: value.trim(), dynamic: dynamic }, range);
+        if (modifiers !== emptyObject) {
+            newHandler.modifiers = modifiers;
+        }
+
+        var handlers = events[name];
+        /* istanbul ignore if */
+        if (Array.isArray(handlers)) {
+            important ? handlers.unshift(newHandler) : handlers.push(newHandler);
+        } else if (handlers) {
+            events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
+        } else {
+            events[name] = newHandler;
+        }
+
+        el.plain = false;
+    }
+
+    function getRawBindingAttr (
+        el,
+        name
+    ) {
+        return el.rawAttrsMap[':' + name] ||
+            el.rawAttrsMap['v-bind:' + name] ||
+            el.rawAttrsMap[name]
+    }
+
+    function getBindingAttr (
+        el,
+        name,
+        getStatic
+    ) {
+        var dynamicValue =
+            getAndRemoveAttr(el, ':' + name) ||
+            getAndRemoveAttr(el, 'v-bind:' + name);
+        if (dynamicValue != null) {
+            return parseFilters(dynamicValue)
+        } else if (getStatic !== false) {
+            var staticValue = getAndRemoveAttr(el, name);
+            if (staticValue != null) {
+                return JSON.stringify(staticValue)
+            }
+        }
+    }
+
+    // note: this only removes the attr from the Array (attrsList) so that it
+    // doesn't get processed by processAttrs.
+    // By default it does NOT remove it from the map (attrsMap) because the map is
+    // needed during codegen.
+    function getAndRemoveAttr (
+        el,
+        name,
+        removeFromMap
+    ) {
+        var val;
+        if ((val = el.attrsMap[name]) != null) {
+            var list = el.attrsList;
+            for (var i = 0, l = list.length; i < l; i++) {
+                if (list[i].name === name) {
+                    list.splice(i, 1);
+                    break
+                }
+            }
+        }
+        if (removeFromMap) {
+            delete el.attrsMap[name];
+        }
+        return val
+    }
+
+    function getAndRemoveAttrByRegex (
+        el,
+        name
+    ) {
+        var list = el.attrsList;
+        for (var i = 0, l = list.length; i < l; i++) {
+            var attr = list[i];
+            if (name.test(attr.name)) {
+                list.splice(i, 1);
+                return attr
+            }
+        }
+    }
+
+    function rangeSetItem (
+        item,
+        range
+    ) {
+        if (range) {
+            if (range.start != null) {
+                item.start = range.start;
+            }
+            if (range.end != null) {
+                item.end = range.end;
+            }
+        }
+        return item
+    }
+
+    /*  */
+
+    /**
+     * Cross-platform code generation for component v-model
+     */
+    function genComponentModel (
+        el,
+        value,
+        modifiers
+    ) {
+        var ref = modifiers || {};
+        var number = ref.number;
+        var trim = ref.trim;
+
+        var baseValueExpression = '$$v';
+        var valueExpression = baseValueExpression;
+        if (trim) {
+            valueExpression =
+                "(typeof " + baseValueExpression + " === 'string'" +
+                "? " + baseValueExpression + ".trim()" +
+                ": " + baseValueExpression + ")";
+        }
+        if (number) {
+            valueExpression = "_n(" + valueExpression + ")";
+        }
+        var assignment = genAssignmentCode(value, valueExpression);
+
+        el.model = {
+            value: ("(" + value + ")"),
+            expression: JSON.stringify(value),
+            callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
+        };
+    }
+
+    /**
+     * Cross-platform codegen helper for generating v-model value assignment code.
+     */
+    function genAssignmentCode (
+        value,
+        assignment
+    ) {
+        var res = parseModel(value);
+        if (res.key === null) {
+            return (value + "=" + assignment)
+        } else {
+            return ("$set(" + (res.exp) + ", " + (res.key) + ", " + assignment + ")")
+        }
+    }
+
+    /**
+     * Parse a v-model expression into a base path and a final key segment.
+     * Handles both dot-path and possible square brackets.
+     *
+     * Possible cases:
+     *
+     * - test
+     * - test[key]
+     * - test[test1[key]]
+     * - test["a"][key]
+     * - xxx.test[a[a].test1[key]]
+     * - test.xxx.a["asa"][test1[key]]
+     *
+     */
+
+    var len, str, chr, index$1, expressionPos, expressionEndPos;
+
+
+
+    function parseModel (val) {
+        // Fix https://github.com/vuejs/vue/pull/7730
+        // allow v-model="obj.val " (trailing whitespace)
+        val = val.trim();
+        len = val.length;
+
+        if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
+            index$1 = val.lastIndexOf('.');
+            if (index$1 > -1) {
+                return {
+                    exp: val.slice(0, index$1),
+                    key: '"' + val.slice(index$1 + 1) + '"'
+                }
+            } else {
+                return {
+                    exp: val,
+                    key: null
+                }
+            }
+        }
+
+        str = val;
+        index$1 = expressionPos = expressionEndPos = 0;
+
+        while (!eof()) {
+            chr = next();
+            /* istanbul ignore if */
+            if (isStringStart(chr)) {
+                parseString(chr);
+            } else if (chr === 0x5B) {
+                parseBracket(chr);
+            }
+        }
+
+        return {
+            exp: val.slice(0, expressionPos),
+            key: val.slice(expressionPos + 1, expressionEndPos)
+        }
+    }
+
+    function next () {
+        return str.charCodeAt(++index$1)
+    }
+
+    function eof () {
+        return index$1 >= len
+    }
+
+    function isStringStart (chr) {
+        return chr === 0x22 || chr === 0x27
+    }
+
+    function parseBracket (chr) {
+        var inBracket = 1;
+        expressionPos = index$1;
+        while (!eof()) {
+            chr = next();
+            if (isStringStart(chr)) {
+                parseString(chr);
+                continue
+            }
+            if (chr === 0x5B) { inBracket++; }
+            if (chr === 0x5D) { inBracket--; }
+            if (inBracket === 0) {
+                expressionEndPos = index$1;
+                break
+            }
+        }
+    }
+
+    function parseString (chr) {
+        var stringQuote = chr;
+        while (!eof()) {
+            chr = next();
+            if (chr === stringQuote) {
+                break
+            }
+        }
+    }
+
+    /*  */
+
+    var warn$1;
+
+    // in some cases, the event used has to be determined at runtime
+    // so we used some reserved tokens during compile.
+    var RANGE_TOKEN = '__r';
+    var CHECKBOX_RADIO_TOKEN = '__c';
+
+    function model (
+        el,
+        dir,
+        _warn
+    ) {
+        warn$1 = _warn;
+        var value = dir.value;
+        var modifiers = dir.modifiers;
+        var tag = el.tag;
+        var type = el.attrsMap.type;
+
+        {
+            // inputs with type="file" are read only and setting the input's
+            // value will throw an error.
+            if (tag === 'input' && type === 'file') {
+                warn$1(
+                    "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
+                    "File inputs are read only. Use a v-on:change listener instead.",
+                    el.rawAttrsMap['v-model']
+                );
+            }
+        }
+
+        if (el.component) {
+            genComponentModel(el, value, modifiers);
+            // component v-model doesn't need extra runtime
+            return false
+        } else if (tag === 'select') {
+            genSelect(el, value, modifiers);
+        } else if (tag === 'input' && type === 'checkbox') {
+            genCheckboxModel(el, value, modifiers);
+        } else if (tag === 'input' && type === 'radio') {
+            genRadioModel(el, value, modifiers);
+        } else if (tag === 'input' || tag === 'textarea') {
+            genDefaultModel(el, value, modifiers);
+        } else if (!config.isReservedTag(tag)) {
+            genComponentModel(el, value, modifiers);
+            // component v-model doesn't need extra runtime
+            return false
+        } else {
+            warn$1(
+                "<" + (el.tag) + " v-model=\"" + value + "\">: " +
+                "v-model is not supported on this element type. " +
+                'If you are working with contenteditable, it\'s recommended to ' +
+                'wrap a library dedicated for that purpose inside a custom component.',
+                el.rawAttrsMap['v-model']
+            );
+        }
+
+        // ensure runtime directive metadata
+        return true
+    }
+
+    function genCheckboxModel (
+        el,
+        value,
+        modifiers
+    ) {
+        var number = modifiers && modifiers.number;
+        var valueBinding = getBindingAttr(el, 'value') || 'null';
+        var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
+        var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
+        addProp(el, 'checked',
+            "Array.isArray(" + value + ")" +
+            "?_i(" + value + "," + valueBinding + ")>-1" + (
+                trueValueBinding === 'true'
+                    ? (":(" + value + ")")
+                    : (":_q(" + value + "," + trueValueBinding + ")")
+            )
+        );
+        addHandler(el, 'change',
+            "var $$a=" + value + "," +
+            '$$el=$event.target,' +
+            "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
+            'if(Array.isArray($$a)){' +
+            "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
+            '$$i=_i($$a,$$v);' +
+            "if($$el.checked){$$i<0&&(" + (genAssignmentCode(value, '$$a.concat([$$v])')) + ")}" +
+            "else{$$i>-1&&(" + (genAssignmentCode(value, '$$a.slice(0,$$i).concat($$a.slice($$i+1))')) + ")}" +
+            "}else{" + (genAssignmentCode(value, '$$c')) + "}",
+            null, true
+        );
+    }
+
+    function genRadioModel (
+        el,
+        value,
+        modifiers
+    ) {
+        var number = modifiers && modifiers.number;
+        var valueBinding = getBindingAttr(el, 'value') || 'null';
+        valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
+        addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
+        addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);
+    }
+
+    function genSelect (
+        el,
+        value,
+        modifiers
+    ) {
+        var number = modifiers && modifiers.number;
+        var selectedVal = "Array.prototype.filter" +
+            ".call($event.target.options,function(o){return o.selected})" +
+            ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
+            "return " + (number ? '_n(val)' : 'val') + "})";
+
+        var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
+        var code = "var $$selectedVal = " + selectedVal + ";";
+        code = code + " " + (genAssignmentCode(value, assignment));
+        addHandler(el, 'change', code, null, true);
+    }
+
+    function genDefaultModel (
+        el,
+        value,
+        modifiers
+    ) {
+        var type = el.attrsMap.type;
+
+        // warn if v-bind:value conflicts with v-model
+        // except for inputs with v-bind:type
+        {
+            var value$1 = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];
+            var typeBinding = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
+            if (value$1 && !typeBinding) {
+                var binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value';
+                warn$1(
+                    binding + "=\"" + value$1 + "\" conflicts with v-model on the same element " +
+                    'because the latter already expands to a value binding internally',
+                    el.rawAttrsMap[binding]
+                );
+            }
+        }
+
+        var ref = modifiers || {};
+        var lazy = ref.lazy;
+        var number = ref.number;
+        var trim = ref.trim;
+        var needCompositionGuard = !lazy && type !== 'range';
+        var event = lazy
+            ? 'change'
+            : type === 'range'
+                ? RANGE_TOKEN
+                : 'input';
+
+        var valueExpression = '$event.target.value';
+        if (trim) {
+            valueExpression = "$event.target.value.trim()";
+        }
+        if (number) {
+            valueExpression = "_n(" + valueExpression + ")";
+        }
+
+        var code = genAssignmentCode(value, valueExpression);
+        if (needCompositionGuard) {
+            code = "if($event.target.composing)return;" + code;
+        }
+
+        addProp(el, 'value', ("(" + value + ")"));
+        addHandler(el, event, code, null, true);
+        if (trim || number) {
+            addHandler(el, 'blur', '$forceUpdate()');
+        }
+    }
+
+    /*  */
+
+    // normalize v-model event tokens that can only be determined at runtime.
+    // it's important to place the event as the first in the array because
+    // the whole point is ensuring the v-model callback gets called before
+    // user-attached handlers.
+    function normalizeEvents (on) {
+        /* istanbul ignore if */
+        if (isDef(on[RANGE_TOKEN])) {
+            // IE input[type=range] only supports `change` event
+            var event = isIE ? 'change' : 'input';
+            on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
+            delete on[RANGE_TOKEN];
+        }
+        // This was originally intended to fix #4521 but no longer necessary
+        // after 2.5. Keeping it for backwards compat with generated code from < 2.4
+        /* istanbul ignore if */
+        if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
+            on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);
+            delete on[CHECKBOX_RADIO_TOKEN];
+        }
+    }
+
+    var target$1;
+
+    function createOnceHandler$1 (event, handler, capture) {
+        var _target = target$1; // save current target element in closure
+        return function onceHandler () {
+            var res = handler.apply(null, arguments);
+            if (res !== null) {
+                remove$2(event, onceHandler, capture, _target);
+            }
+        }
+    }
+
+    // #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
+    // implementation and does not fire microtasks in between event propagation, so
+    // safe to exclude.
+    var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
+
+    function add$1 (
+        name,
+        handler,
+        capture,
+        passive
+    ) {
+        // async edge case #6566: inner click event triggers patch, event handler
+        // attached to outer element during patch, and triggered again. This
+        // happens because browsers fire microtask ticks between event propagation.
+        // the solution is simple: we save the timestamp when a handler is attached,
+        // and the handler would only fire if the event passed to it was fired
+        // AFTER it was attached.
+        if (useMicrotaskFix) {
+            var attachedTimestamp = currentFlushTimestamp;
+            var original = handler;
+            handler = original._wrapper = function (e) {
+                if (
+                    // no bubbling, should always fire.
+                    // this is just a safety net in case event.timeStamp is unreliable in
+                    // certain weird environments...
+                    e.target === e.currentTarget ||
+                    // event is fired after handler attachment
+                    e.timeStamp >= attachedTimestamp ||
+                    // bail for environments that have buggy event.timeStamp implementations
+                    // #9462 iOS 9 bug: event.timeStamp is 0 after history.pushState
+                    // #9681 QtWebEngine event.timeStamp is negative value
+                    e.timeStamp <= 0 ||
+                    // #9448 bail if event is fired in another document in a multi-page
+                    // electron/nw.js app, since event.timeStamp will be using a different
+                    // starting reference
+                    e.target.ownerDocument !== document
+                ) {
+                    return original.apply(this, arguments)
+                }
+            };
+        }
+        target$1.addEventListener(
+            name,
+            handler,
+            supportsPassive
+                ? { capture: capture, passive: passive }
+                : capture
+        );
+    }
+
+    function remove$2 (
+        name,
+        handler,
+        capture,
+        _target
+    ) {
+        (_target || target$1).removeEventListener(
+            name,
+            handler._wrapper || handler,
+            capture
+        );
+    }
+
+    function updateDOMListeners (oldVnode, vnode) {
+        if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
+            return
+        }
+        var on = vnode.data.on || {};
+        var oldOn = oldVnode.data.on || {};
+        target$1 = vnode.elm;
+        normalizeEvents(on);
+        updateListeners(on, oldOn, add$1, remove$2, createOnceHandler$1, vnode.context);
+        target$1 = undefined;
+    }
+
+    var events = {
+        create: updateDOMListeners,
+        update: updateDOMListeners
+    };
+
+    /*  */
+
+    var svgContainer;
+
+    function updateDOMProps (oldVnode, vnode) {
+        if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
+            return
+        }
+        var key, cur;
+        var elm = vnode.elm;
+        var oldProps = oldVnode.data.domProps || {};
+        var props = vnode.data.domProps || {};
+        // clone observed objects, as the user probably wants to mutate it
+        if (isDef(props.__ob__)) {
+            props = vnode.data.domProps = extend({}, props);
+        }
+
+        for (key in oldProps) {
+            if (!(key in props)) {
+                elm[key] = '';
+            }
+        }
+
+        for (key in props) {
+            cur = props[key];
+            // ignore children if the node has textContent or innerHTML,
+            // as these will throw away existing DOM nodes and cause removal errors
+            // on subsequent patches (#3360)
+            if (key === 'textContent' || key === 'innerHTML') {
+                if (vnode.children) { vnode.children.length = 0; }
+                if (cur === oldProps[key]) { continue }
+                // #6601 work around Chrome version <= 55 bug where single textNode
+                // replaced by innerHTML/textContent retains its parentNode property
+                if (elm.childNodes.length === 1) {
+                    elm.removeChild(elm.childNodes[0]);
+                }
+            }
+
+            if (key === 'value' && elm.tagName !== 'PROGRESS') {
+                // store value as _value as well since
+                // non-string values will be stringified
+                elm._value = cur;
+                // avoid resetting cursor position when value is the same
+                var strCur = isUndef(cur) ? '' : String(cur);
+                if (shouldUpdateValue(elm, strCur)) {
+                    elm.value = strCur;
+                }
+            } else if (key === 'innerHTML' && isSVG(elm.tagName) && isUndef(elm.innerHTML)) {
+                // IE doesn't support innerHTML for SVG elements
+                svgContainer = svgContainer || document.createElement('div');
+                svgContainer.innerHTML = "<svg>" + cur + "</svg>";
+                var svg = svgContainer.firstChild;
+                while (elm.firstChild) {
+                    elm.removeChild(elm.firstChild);
+                }
+                while (svg.firstChild) {
+                    elm.appendChild(svg.firstChild);
+                }
+            } else if (
+                // skip the update if old and new VDOM state is the same.
+                // `value` is handled separately because the DOM value may be temporarily
+                // out of sync with VDOM state due to focus, composition and modifiers.
+                // This  #4521 by skipping the unnecessary `checked` update.
+                cur !== oldProps[key]
+            ) {
+                // some property updates can throw
+                // e.g. `value` on <progress> w/ non-finite value
+                try {
+                    elm[key] = cur;
+                } catch (e) {}
+            }
+        }
+    }
+
+    // check platforms/web/util/attrs.js acceptValue
+
+
+    function shouldUpdateValue (elm, checkVal) {
+        return (!elm.composing && (
+            elm.tagName === 'OPTION' ||
+            isNotInFocusAndDirty(elm, checkVal) ||
+            isDirtyWithModifiers(elm, checkVal)
+        ))
+    }
+
+    function isNotInFocusAndDirty (elm, checkVal) {
+        // return true when textbox (.number and .trim) loses focus and its value is
+        // not equal to the updated value
+        var notInFocus = true;
+        // #6157
+        // work around IE bug when accessing document.activeElement in an iframe
+        try { notInFocus = document.activeElement !== elm; } catch (e) {}
+        return notInFocus && elm.value !== checkVal
+    }
+
+    function isDirtyWithModifiers (elm, newVal) {
+        var value = elm.value;
+        var modifiers = elm._vModifiers; // injected by v-model runtime
+        if (isDef(modifiers)) {
+            if (modifiers.number) {
+                return toNumber(value) !== toNumber(newVal)
+            }
+            if (modifiers.trim) {
+                return value.trim() !== newVal.trim()
+            }
+        }
+        return value !== newVal
+    }
+
+    var domProps = {
+        create: updateDOMProps,
+        update: updateDOMProps
+    };
+
+    /*  */
+
+    var parseStyleText = cached(function (cssText) {
+        var res = {};
+        var listDelimiter = /;(?![^(]*\))/g;
+        var propertyDelimiter = /:(.+)/;
+        cssText.split(listDelimiter).forEach(function (item) {
+            if (item) {
+                var tmp = item.split(propertyDelimiter);
+                tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
+            }
+        });
+        return res
+    });
+
+    // merge static and dynamic style data on the same vnode
+    function normalizeStyleData (data) {
+        var style = normalizeStyleBinding(data.style);
+        // static style is pre-processed into an object during compilation
+        // and is always a fresh object, so it's safe to merge into it
+        return data.staticStyle
+            ? extend(data.staticStyle, style)
+            : style
+    }
+
+    // normalize possible array / string values into Object
+    function normalizeStyleBinding (bindingStyle) {
+        if (Array.isArray(bindingStyle)) {
+            return toObject(bindingStyle)
+        }
+        if (typeof bindingStyle === 'string') {
+            return parseStyleText(bindingStyle)
+        }
+        return bindingStyle
+    }
+
+    /**
+     * parent component style should be after child's
+     * so that parent component's style could override it
+     */
+    function getStyle (vnode, checkChild) {
+        var res = {};
+        var styleData;
+
+        if (checkChild) {
+            var childNode = vnode;
+            while (childNode.componentInstance) {
+                childNode = childNode.componentInstance._vnode;
+                if (
+                    childNode && childNode.data &&
+                    (styleData = normalizeStyleData(childNode.data))
+                ) {
+                    extend(res, styleData);
+                }
+            }
+        }
+
+        if ((styleData = normalizeStyleData(vnode.data))) {
+            extend(res, styleData);
+        }
+
+        var parentNode = vnode;
+        while ((parentNode = parentNode.parent)) {
+            if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
+                extend(res, styleData);
+            }
+        }
+        return res
+    }
+
+    /*  */
+
+    var cssVarRE = /^--/;
+    var importantRE = /\s*!important$/;
+    var setProp = function (el, name, val) {
+        /* istanbul ignore if */
+        if (cssVarRE.test(name)) {
+            el.style.setProperty(name, val);
+        } else if (importantRE.test(val)) {
+            el.style.setProperty(hyphenate(name), val.replace(importantRE, ''), 'important');
+        } else {
+            var normalizedName = normalize(name);
+            if (Array.isArray(val)) {
+                // Support values array created by autoprefixer, e.g.
+                // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
+                // Set them one by one, and the browser will only set those it can recognize
+                for (var i = 0, len = val.length; i < len; i++) {
+                    el.style[normalizedName] = val[i];
+                }
+            } else {
+                el.style[normalizedName] = val;
+            }
+        }
+    };
+
+    var vendorNames = ['Webkit', 'Moz', 'ms'];
+
+    var emptyStyle;
+    var normalize = cached(function (prop) {
+        emptyStyle = emptyStyle || document.createElement('div').style;
+        prop = camelize(prop);
+        if (prop !== 'filter' && (prop in emptyStyle)) {
+            return prop
+        }
+        var capName = prop.charAt(0).toUpperCase() + prop.slice(1);
+        for (var i = 0; i < vendorNames.length; i++) {
+            var name = vendorNames[i] + capName;
+            if (name in emptyStyle) {
+                return name
+            }
+        }
+    });
+
+    function updateStyle (oldVnode, vnode) {
+        var data = vnode.data;
+        var oldData = oldVnode.data;
+
+        if (isUndef(data.staticStyle) && isUndef(data.style) &&
+            isUndef(oldData.staticStyle) && isUndef(oldData.style)
+        ) {
+            return
+        }
+
+        var cur, name;
+        var el = vnode.elm;
+        var oldStaticStyle = oldData.staticStyle;
+        var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};
+
+        // if static style exists, stylebinding already merged into it when doing normalizeStyleData
+        var oldStyle = oldStaticStyle || oldStyleBinding;
+
+        var style = normalizeStyleBinding(vnode.data.style) || {};
+
+        // store normalized style under a different key for next diff
+        // make sure to clone it if it's reactive, since the user likely wants
+        // to mutate it.
+        vnode.data.normalizedStyle = isDef(style.__ob__)
+            ? extend({}, style)
+            : style;
+
+        var newStyle = getStyle(vnode, true);
+
+        for (name in oldStyle) {
+            if (isUndef(newStyle[name])) {
+                setProp(el, name, '');
+            }
+        }
+        for (name in newStyle) {
+            cur = newStyle[name];
+            if (cur !== oldStyle[name]) {
+                // ie9 setting to null has no effect, must use empty string
+                setProp(el, name, cur == null ? '' : cur);
+            }
+        }
+    }
+
+    var style = {
+        create: updateStyle,
+        update: updateStyle
+    };
+
+    /*  */
+
+    var whitespaceRE = /\s+/;
+
+    /**
+     * Add class with compatibility for SVG since classList is not supported on
+     * SVG elements in IE
+     */
+    function addClass (el, cls) {
+        /* istanbul ignore if */
+        if (!cls || !(cls = cls.trim())) {
+            return
+        }
+
+        /* istanbul ignore else */
+        if (el.classList) {
+            if (cls.indexOf(' ') > -1) {
+                cls.split(whitespaceRE).forEach(function (c) { return el.classList.add(c); });
+            } else {
+                el.classList.add(cls);
+            }
+        } else {
+            var cur = " " + (el.getAttribute('class') || '') + " ";
+            if (cur.indexOf(' ' + cls + ' ') < 0) {
+                el.setAttribute('class', (cur + cls).trim());
+            }
+        }
+    }
+
+    /**
+     * Remove class with compatibility for SVG since classList is not supported on
+     * SVG elements in IE
+     */
+    function removeClass (el, cls) {
+        /* istanbul ignore if */
+        if (!cls || !(cls = cls.trim())) {
+            return
+        }
+
+        /* istanbul ignore else */
+        if (el.classList) {
+            if (cls.indexOf(' ') > -1) {
+                cls.split(whitespaceRE).forEach(function (c) { return el.classList.remove(c); });
+            } else {
+                el.classList.remove(cls);
+            }
+            if (!el.classList.length) {
+                el.removeAttribute('class');
+            }
+        } else {
+            var cur = " " + (el.getAttribute('class') || '') + " ";
+            var tar = ' ' + cls + ' ';
+            while (cur.indexOf(tar) >= 0) {
+                cur = cur.replace(tar, ' ');
+            }
+            cur = cur.trim();
+            if (cur) {
+                el.setAttribute('class', cur);
+            } else {
+                el.removeAttribute('class');
+            }
+        }
+    }
+
+    /*  */
+
+    function resolveTransition (def$$1) {
+        if (!def$$1) {
+            return
+        }
+        /* istanbul ignore else */
+        if (typeof def$$1 === 'object') {
+            var res = {};
+            if (def$$1.css !== false) {
+                extend(res, autoCssTransition(def$$1.name || 'v'));
+            }
+            extend(res, def$$1);
+            return res
+        } else if (typeof def$$1 === 'string') {
+            return autoCssTransition(def$$1)
+        }
+    }
+
+    var autoCssTransition = cached(function (name) {
+        return {
+            enterClass: (name + "-enter"),
+            enterToClass: (name + "-enter-to"),
+            enterActiveClass: (name + "-enter-active"),
+            leaveClass: (name + "-leave"),
+            leaveToClass: (name + "-leave-to"),
+            leaveActiveClass: (name + "-leave-active")
+        }
+    });
+
+    var hasTransition = inBrowser && !isIE9;
+    var TRANSITION = 'transition';
+    var ANIMATION = 'animation';
+
+    // Transition property/event sniffing
+    var transitionProp = 'transition';
+    var transitionEndEvent = 'transitionend';
+    var animationProp = 'animation';
+    var animationEndEvent = 'animationend';
+    if (hasTransition) {
+        /* istanbul ignore if */
+        if (window.ontransitionend === undefined &&
+            window.onwebkittransitionend !== undefined
+        ) {
+            transitionProp = 'WebkitTransition';
+            transitionEndEvent = 'webkitTransitionEnd';
+        }
+        if (window.onanimationend === undefined &&
+            window.onwebkitanimationend !== undefined
+        ) {
+            animationProp = 'WebkitAnimation';
+            animationEndEvent = 'webkitAnimationEnd';
+        }
+    }
+
+    // binding to window is necessary to make hot reload work in IE in strict mode
+    var raf = inBrowser
+        ? window.requestAnimationFrame
+            ? window.requestAnimationFrame.bind(window)
+            : setTimeout
+        : /* istanbul ignore next */ function (fn) { return fn(); };
+
+    function nextFrame (fn) {
+        raf(function () {
+            raf(fn);
+        });
+    }
+
+    function addTransitionClass (el, cls) {
+        var transitionClasses = el._transitionClasses || (el._transitionClasses = []);
+        if (transitionClasses.indexOf(cls) < 0) {
+            transitionClasses.push(cls);
+            addClass(el, cls);
+        }
+    }
+
+    function removeTransitionClass (el, cls) {
+        if (el._transitionClasses) {
+            remove(el._transitionClasses, cls);
+        }
+        removeClass(el, cls);
+    }
+
+    function whenTransitionEnds (
+        el,
+        expectedType,
+        cb
+    ) {
+        var ref = getTransitionInfo(el, expectedType);
+        var type = ref.type;
+        var timeout = ref.timeout;
+        var propCount = ref.propCount;
+        if (!type) { return cb() }
+        var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
+        var ended = 0;
+        var end = function () {
+            el.removeEventListener(event, onEnd);
+            cb();
+        };
+        var onEnd = function (e) {
+            if (e.target === el) {
+                if (++ended >= propCount) {
+                    end();
+                }
+            }
+        };
+        setTimeout(function () {
+            if (ended < propCount) {
+                end();
+            }
+        }, timeout + 1);
+        el.addEventListener(event, onEnd);
+    }
+
+    var transformRE = /\b(transform|all)(,|$)/;
+
+    function getTransitionInfo (el, expectedType) {
+        var styles = window.getComputedStyle(el);
+        // JSDOM may return undefined for transition properties
+        var transitionDelays = (styles[transitionProp + 'Delay'] || '').split(', ');
+        var transitionDurations = (styles[transitionProp + 'Duration'] || '').split(', ');
+        var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
+        var animationDelays = (styles[animationProp + 'Delay'] || '').split(', ');
+        var animationDurations = (styles[animationProp + 'Duration'] || '').split(', ');
+        var animationTimeout = getTimeout(animationDelays, animationDurations);
+
+        var type;
+        var timeout = 0;
+        var propCount = 0;
+        /* istanbul ignore if */
+        if (expectedType === TRANSITION) {
+            if (transitionTimeout > 0) {
+                type = TRANSITION;
+                timeout = transitionTimeout;
+                propCount = transitionDurations.length;
+            }
+        } else if (expectedType === ANIMATION) {
+            if (animationTimeout > 0) {
+                type = ANIMATION;
+                timeout = animationTimeout;
+                propCount = animationDurations.length;
+            }
+        } else {
+            timeout = Math.max(transitionTimeout, animationTimeout);
+            type = timeout > 0
+                ? transitionTimeout > animationTimeout
+                    ? TRANSITION
+                    : ANIMATION
+                : null;
+            propCount = type
+                ? type === TRANSITION
+                    ? transitionDurations.length
+                    : animationDurations.length
+                : 0;
+        }
+        var hasTransform =
+            type === TRANSITION &&
+            transformRE.test(styles[transitionProp + 'Property']);
+        return {
+            type: type,
+            timeout: timeout,
+            propCount: propCount,
+            hasTransform: hasTransform
+        }
+    }
+
+    function getTimeout (delays, durations) {
+        /* istanbul ignore next */
+        while (delays.length < durations.length) {
+            delays = delays.concat(delays);
+        }
+
+        return Math.max.apply(null, durations.map(function (d, i) {
+            return toMs(d) + toMs(delays[i])
+        }))
+    }
+
+    // Old versions of Chromium (below 61.0.3163.100) formats floating pointer numbers
+    // in a locale-dependent way, using a comma instead of a dot.
+    // If comma is not replaced with a dot, the input will be rounded down (i.e. acting
+    // as a floor function) causing unexpected behaviors
+    function toMs (s) {
+        return Number(s.slice(0, -1).replace(',', '.')) * 1000
+    }
+
+    /*  */
+
+    function enter (vnode, toggleDisplay) {
+        var el = vnode.elm;
+
+        // call leave callback now
+        if (isDef(el._leaveCb)) {
+            el._leaveCb.cancelled = true;
+            el._leaveCb();
+        }
+
+        var data = resolveTransition(vnode.data.transition);
+        if (isUndef(data)) {
+            return
+        }
+
+        /* istanbul ignore if */
+        if (isDef(el._enterCb) || el.nodeType !== 1) {
+            return
+        }
+
+        var css = data.css;
+        var type = data.type;
+        var enterClass = data.enterClass;
+        var enterToClass = data.enterToClass;
+        var enterActiveClass = data.enterActiveClass;
+        var appearClass = data.appearClass;
+        var appearToClass = data.appearToClass;
+        var appearActiveClass = data.appearActiveClass;
+        var beforeEnter = data.beforeEnter;
+        var enter = data.enter;
+        var afterEnter = data.afterEnter;
+        var enterCancelled = data.enterCancelled;
+        var beforeAppear = data.beforeAppear;
+        var appear = data.appear;
+        var afterAppear = data.afterAppear;
+        var appearCancelled = data.appearCancelled;
+        var duration = data.duration;
+
+        // activeInstance will always be the <transition> component managing this
+        // transition. One edge case to check is when the <transition> is placed
+        // as the root node of a child component. In that case we need to check
+        // <transition>'s parent for appear check.
+        var context = activeInstance;
+        var transitionNode = activeInstance.$vnode;
+        while (transitionNode && transitionNode.parent) {
+            context = transitionNode.context;
+            transitionNode = transitionNode.parent;
+        }
+
+        var isAppear = !context._isMounted || !vnode.isRootInsert;
+
+        if (isAppear && !appear && appear !== '') {
+            return
+        }
+
+        var startClass = isAppear && appearClass
+            ? appearClass
+            : enterClass;
+        var activeClass = isAppear && appearActiveClass
+            ? appearActiveClass
+            : enterActiveClass;
+        var toClass = isAppear && appearToClass
+            ? appearToClass
+            : enterToClass;
+
+        var beforeEnterHook = isAppear
+            ? (beforeAppear || beforeEnter)
+            : beforeEnter;
+        var enterHook = isAppear
+            ? (typeof appear === 'function' ? appear : enter)
+            : enter;
+        var afterEnterHook = isAppear
+            ? (afterAppear || afterEnter)
+            : afterEnter;
+        var enterCancelledHook = isAppear
+            ? (appearCancelled || enterCancelled)
+            : enterCancelled;
+
+        var explicitEnterDuration = toNumber(
+            isObject(duration)
+                ? duration.enter
+                : duration
+        );
+
+        if (explicitEnterDuration != null) {
+            checkDuration(explicitEnterDuration, 'enter', vnode);
+        }
+
+        var expectsCSS = css !== false && !isIE9;
+        var userWantsControl = getHookArgumentsLength(enterHook);
+
+        var cb = el._enterCb = once(function () {
+            if (expectsCSS) {
+                removeTransitionClass(el, toClass);
+                removeTransitionClass(el, activeClass);
+            }
+            if (cb.cancelled) {
+                if (expectsCSS) {
+                    removeTransitionClass(el, startClass);
+                }
+                enterCancelledHook && enterCancelledHook(el);
+            } else {
+                afterEnterHook && afterEnterHook(el);
+            }
+            el._enterCb = null;
+        });
+
+        if (!vnode.data.show) {
+            // remove pending leave element on enter by injecting an insert hook
+            mergeVNodeHook(vnode, 'insert', function () {
+                var parent = el.parentNode;
+                var pendingNode = parent && parent._pending && parent._pending[vnode.key];
+                if (pendingNode &&
+                    pendingNode.tag === vnode.tag &&
+                    pendingNode.elm._leaveCb
+                ) {
+                    pendingNode.elm._leaveCb();
+                }
+                enterHook && enterHook(el, cb);
+            });
+        }
+
+        // start enter transition
+        beforeEnterHook && beforeEnterHook(el);
+        if (expectsCSS) {
+            addTransitionClass(el, startClass);
+            addTransitionClass(el, activeClass);
+            nextFrame(function () {
+                removeTransitionClass(el, startClass);
+                if (!cb.cancelled) {
+                    addTransitionClass(el, toClass);
+                    if (!userWantsControl) {
+                        if (isValidDuration(explicitEnterDuration)) {
+                            setTimeout(cb, explicitEnterDuration);
+                        } else {
+                            whenTransitionEnds(el, type, cb);
+                        }
+                    }
+                }
+            });
+        }
+
+        if (vnode.data.show) {
+            toggleDisplay && toggleDisplay();
+            enterHook && enterHook(el, cb);
+        }
+
+        if (!expectsCSS && !userWantsControl) {
+            cb();
+        }
+    }
+
+    function leave (vnode, rm) {
+        var el = vnode.elm;
+
+        // call enter callback now
+        if (isDef(el._enterCb)) {
+            el._enterCb.cancelled = true;
+            el._enterCb();
+        }
+
+        var data = resolveTransition(vnode.data.transition);
+        if (isUndef(data) || el.nodeType !== 1) {
+            return rm()
+        }
+
+        /* istanbul ignore if */
+        if (isDef(el._leaveCb)) {
+            return
+        }
+
+        var css = data.css;
+        var type = data.type;
+        var leaveClass = data.leaveClass;
+        var leaveToClass = data.leaveToClass;
+        var leaveActiveClass = data.leaveActiveClass;
+        var beforeLeave = data.beforeLeave;
+        var leave = data.leave;
+        var afterLeave = data.afterLeave;
+        var leaveCancelled = data.leaveCancelled;
+        var delayLeave = data.delayLeave;
+        var duration = data.duration;
+
+        var expectsCSS = css !== false && !isIE9;
+        var userWantsControl = getHookArgumentsLength(leave);
+
+        var explicitLeaveDuration = toNumber(
+            isObject(duration)
+                ? duration.leave
+                : duration
+        );
+
+        if (isDef(explicitLeaveDuration)) {
+            checkDuration(explicitLeaveDuration, 'leave', vnode);
+        }
+
+        var cb = el._leaveCb = once(function () {
+            if (el.parentNode && el.parentNode._pending) {
+                el.parentNode._pending[vnode.key] = null;
+            }
+            if (expectsCSS) {
+                removeTransitionClass(el, leaveToClass);
+                removeTransitionClass(el, leaveActiveClass);
+            }
+            if (cb.cancelled) {
+                if (expectsCSS) {
+                    removeTransitionClass(el, leaveClass);
+                }
+                leaveCancelled && leaveCancelled(el);
+            } else {
+                rm();
+                afterLeave && afterLeave(el);
+            }
+            el._leaveCb = null;
+        });
+
+        if (delayLeave) {
+            delayLeave(performLeave);
+        } else {
+            performLeave();
+        }
+
+        function performLeave () {
+            // the delayed leave may have already been cancelled
+            if (cb.cancelled) {
+                return
+            }
+            // record leaving element
+            if (!vnode.data.show && el.parentNode) {
+                (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
+            }
+            beforeLeave && beforeLeave(el);
+            if (expectsCSS) {
+                addTransitionClass(el, leaveClass);
+                addTransitionClass(el, leaveActiveClass);
+                nextFrame(function () {
+                    removeTransitionClass(el, leaveClass);
+                    if (!cb.cancelled) {
+                        addTransitionClass(el, leaveToClass);
+                        if (!userWantsControl) {
+                            if (isValidDuration(explicitLeaveDuration)) {
+                                setTimeout(cb, explicitLeaveDuration);
+                            } else {
+                                whenTransitionEnds(el, type, cb);
+                            }
+                        }
+                    }
+                });
+            }
+            leave && leave(el, cb);
+            if (!expectsCSS && !userWantsControl) {
+                cb();
+            }
+        }
+    }
+
+    // only used in dev mode
+    function checkDuration (val, name, vnode) {
+        if (typeof val !== 'number') {
+            warn(
+                "<transition> explicit " + name + " duration is not a valid number - " +
+                "got " + (JSON.stringify(val)) + ".",
+                vnode.context
+            );
+        } else if (isNaN(val)) {
+            warn(
+                "<transition> explicit " + name + " duration is NaN - " +
+                'the duration expression might be incorrect.',
+                vnode.context
+            );
+        }
+    }
+
+    function isValidDuration (val) {
+        return typeof val === 'number' && !isNaN(val)
+    }
+
+    /**
+     * Normalize a transition hook's argument length. The hook may be:
+     * - a merged hook (invoker) with the original in .fns
+     * - a wrapped component method (check ._length)
+     * - a plain function (.length)
+     */
+    function getHookArgumentsLength (fn) {
+        if (isUndef(fn)) {
+            return false
+        }
+        var invokerFns = fn.fns;
+        if (isDef(invokerFns)) {
+            // invoker
+            return getHookArgumentsLength(
+                Array.isArray(invokerFns)
+                    ? invokerFns[0]
+                    : invokerFns
+            )
+        } else {
+            return (fn._length || fn.length) > 1
+        }
+    }
+
+    function _enter (_, vnode) {
+        if (vnode.data.show !== true) {
+            enter(vnode);
+        }
+    }
+
+    var transition = inBrowser ? {
+        create: _enter,
+        activate: _enter,
+        remove: function remove$$1 (vnode, rm) {
+            /* istanbul ignore else */
+            if (vnode.data.show !== true) {
+                leave(vnode, rm);
+            } else {
+                rm();
+            }
+        }
+    } : {};
+
+    var platformModules = [
+        attrs,
+        klass,
+        events,
+        domProps,
+        style,
+        transition
+    ];
+
+    /*  */
+
+    // the directive module should be applied last, after all
+    // built-in modules have been applied.
+    var modules = platformModules.concat(baseModules);
+
+    var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });
+
+    /**
+     * Not type checking this file because flow doesn't like attaching
+     * properties to Elements.
+     */
+
+    /* istanbul ignore if */
+    if (isIE9) {
+        // http://www.matts411.com/post/internet-explorer-9-oninput/
+        document.addEventListener('selectionchange', function () {
+            var el = document.activeElement;
+            if (el && el.vmodel) {
+                trigger(el, 'input');
+            }
+        });
+    }
+
+    var directive = {
+        inserted: function inserted (el, binding, vnode, oldVnode) {
+            if (vnode.tag === 'select') {
+                // #6903
+                if (oldVnode.elm && !oldVnode.elm._vOptions) {
+                    mergeVNodeHook(vnode, 'postpatch', function () {
+                        directive.componentUpdated(el, binding, vnode);
+                    });
+                } else {
+                    setSelected(el, binding, vnode.context);
+                }
+                el._vOptions = [].map.call(el.options, getValue);
+            } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
+                el._vModifiers = binding.modifiers;
+                if (!binding.modifiers.lazy) {
+                    el.addEventListener('compositionstart', onCompositionStart);
+                    el.addEventListener('compositionend', onCompositionEnd);
+                    // Safari < 10.2 & UIWebView doesn't fire compositionend when
+                    // switching focus before confirming composition choice
+                    // this also fixes the issue where some browsers e.g. iOS Chrome
+                    // fires "change" instead of "input" on autocomplete.
+                    el.addEventListener('change', onCompositionEnd);
+                    /* istanbul ignore if */
+                    if (isIE9) {
+                        el.vmodel = true;
+                    }
+                }
+            }
+        },
+
+        componentUpdated: function componentUpdated (el, binding, vnode) {
+            if (vnode.tag === 'select') {
+                setSelected(el, binding, vnode.context);
+                // in case the options rendered by v-for have changed,
+                // it's possible that the value is out-of-sync with the rendered options.
+                // detect such cases and filter out values that no longer has a matching
+                // option in the DOM.
+                var prevOptions = el._vOptions;
+                var curOptions = el._vOptions = [].map.call(el.options, getValue);
+                if (curOptions.some(function (o, i) { return !looseEqual(o, prevOptions[i]); })) {
+                    // trigger change event if
+                    // no matching option found for at least one value
+                    var needReset = el.multiple
+                        ? binding.value.some(function (v) { return hasNoMatchingOption(v, curOptions); })
+                        : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);
+                    if (needReset) {
+                        trigger(el, 'change');
+                    }
+                }
+            }
+        }
+    };
+
+    function setSelected (el, binding, vm) {
+        actuallySetSelected(el, binding, vm);
+        /* istanbul ignore if */
+        if (isIE || isEdge) {
+            setTimeout(function () {
+                actuallySetSelected(el, binding, vm);
+            }, 0);
+        }
+    }
+
+    function actuallySetSelected (el, binding, vm) {
+        var value = binding.value;
+        var isMultiple = el.multiple;
+        if (isMultiple && !Array.isArray(value)) {
+            warn(
+                "<select multiple v-model=\"" + (binding.expression) + "\"> " +
+                "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
+                vm
+            );
+            return
+        }
+        var selected, option;
+        for (var i = 0, l = el.options.length; i < l; i++) {
+            option = el.options[i];
+            if (isMultiple) {
+                selected = looseIndexOf(value, getValue(option)) > -1;
+                if (option.selected !== selected) {
+                    option.selected = selected;
+                }
+            } else {
+                if (looseEqual(getValue(option), value)) {
+                    if (el.selectedIndex !== i) {
+                        el.selectedIndex = i;
+                    }
+                    return
+                }
+            }
+        }
+        if (!isMultiple) {
+            el.selectedIndex = -1;
+        }
+    }
+
+    function hasNoMatchingOption (value, options) {
+        return options.every(function (o) { return !looseEqual(o, value); })
+    }
+
+    function getValue (option) {
+        return '_value' in option
+            ? option._value
+            : option.value
+    }
+
+    function onCompositionStart (e) {
+        e.target.composing = true;
+    }
+
+    function onCompositionEnd (e) {
+        // prevent triggering an input event for no reason
+        if (!e.target.composing) { return }
+        e.target.composing = false;
+        trigger(e.target, 'input');
+    }
+
+    function trigger (el, type) {
+        var e = document.createEvent('HTMLEvents');
+        e.initEvent(type, true, true);
+        el.dispatchEvent(e);
+    }
+
+    /*  */
+
+    // recursively search for possible transition defined inside the component root
+    function locateNode (vnode) {
+        return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
+            ? locateNode(vnode.componentInstance._vnode)
+            : vnode
+    }
+
+    var show = {
+        bind: function bind (el, ref, vnode) {
+            var value = ref.value;
+
+            vnode = locateNode(vnode);
+            var transition$$1 = vnode.data && vnode.data.transition;
+            var originalDisplay = el.__vOriginalDisplay =
+                el.style.display === 'none' ? '' : el.style.display;
+            if (value && transition$$1) {
+                vnode.data.show = true;
+                enter(vnode, function () {
+                    el.style.display = originalDisplay;
+                });
+            } else {
+                el.style.display = value ? originalDisplay : 'none';
+            }
+        },
+
+        update: function update (el, ref, vnode) {
+            var value = ref.value;
+            var oldValue = ref.oldValue;
+
+            /* istanbul ignore if */
+            if (!value === !oldValue) { return }
+            vnode = locateNode(vnode);
+            var transition$$1 = vnode.data && vnode.data.transition;
+            if (transition$$1) {
+                vnode.data.show = true;
+                if (value) {
+                    enter(vnode, function () {
+                        el.style.display = el.__vOriginalDisplay;
+                    });
+                } else {
+                    leave(vnode, function () {
+                        el.style.display = 'none';
+                    });
+                }
+            } else {
+                el.style.display = value ? el.__vOriginalDisplay : 'none';
+            }
+        },
+
+        unbind: function unbind (
+            el,
+            binding,
+            vnode,
+            oldVnode,
+            isDestroy
+        ) {
+            if (!isDestroy) {
+                el.style.display = el.__vOriginalDisplay;
+            }
+        }
+    };
+
+    var platformDirectives = {
+        model: directive,
+        show: show
+    };
+
+    /*  */
+
+    var transitionProps = {
+        name: String,
+        appear: Boolean,
+        css: Boolean,
+        mode: String,
+        type: String,
+        enterClass: String,
+        leaveClass: String,
+        enterToClass: String,
+        leaveToClass: String,
+        enterActiveClass: String,
+        leaveActiveClass: String,
+        appearClass: String,
+        appearActiveClass: String,
+        appearToClass: String,
+        duration: [Number, String, Object]
+    };
+
+    // in case the child is also an abstract component, e.g. <keep-alive>
+    // we want to recursively retrieve the real component to be rendered
+    function getRealChild (vnode) {
+        var compOptions = vnode && vnode.componentOptions;
+        if (compOptions && compOptions.Ctor.options.abstract) {
+            return getRealChild(getFirstComponentChild(compOptions.children))
+        } else {
+            return vnode
+        }
+    }
+
+    function extractTransitionData (comp) {
+        var data = {};
+        var options = comp.$options;
+        // props
+        for (var key in options.propsData) {
+            data[key] = comp[key];
+        }
+        // events.
+        // extract listeners and pass them directly to the transition methods
+        var listeners = options._parentListeners;
+        for (var key$1 in listeners) {
+            data[camelize(key$1)] = listeners[key$1];
+        }
+        return data
+    }
+
+    function placeholder (h, rawChild) {
+        if (/\d-keep-alive$/.test(rawChild.tag)) {
+            return h('keep-alive', {
+                props: rawChild.componentOptions.propsData
+            })
+        }
+    }
+
+    function hasParentTransition (vnode) {
+        while ((vnode = vnode.parent)) {
+            if (vnode.data.transition) {
+                return true
+            }
+        }
+    }
+
+    function isSameChild (child, oldChild) {
+        return oldChild.key === child.key && oldChild.tag === child.tag
+    }
+
+    var isNotTextNode = function (c) { return c.tag || isAsyncPlaceholder(c); };
+
+    var isVShowDirective = function (d) { return d.name === 'show'; };
+
+    var Transition = {
+        name: 'transition',
+        props: transitionProps,
+        abstract: true,
+
+        render: function render (h) {
+            var this$1 = this;
+
+            var children = this.$slots.default;
+            if (!children) {
+                return
+            }
+
+            // filter out text nodes (possible whitespaces)
+            children = children.filter(isNotTextNode);
+            /* istanbul ignore if */
+            if (!children.length) {
+                return
+            }
+
+            // warn multiple elements
+            if (children.length > 1) {
+                warn(
+                    '<transition> can only be used on a single element. Use ' +
+                    '<transition-group> for lists.',
+                    this.$parent
+                );
+            }
+
+            var mode = this.mode;
+
+            // warn invalid mode
+            if (mode && mode !== 'in-out' && mode !== 'out-in'
+            ) {
+                warn(
+                    'invalid <transition> mode: ' + mode,
+                    this.$parent
+                );
+            }
+
+            var rawChild = children[0];
+
+            // if this is a component root node and the component's
+            // parent container node also has transition, skip.
+            if (hasParentTransition(this.$vnode)) {
+                return rawChild
+            }
+
+            // apply transition data to child
+            // use getRealChild() to ignore abstract components e.g. keep-alive
+            var child = getRealChild(rawChild);
+            /* istanbul ignore if */
+            if (!child) {
+                return rawChild
+            }
+
+            if (this._leaving) {
+                return placeholder(h, rawChild)
+            }
+
+            // ensure a key that is unique to the vnode type and to this transition
+            // component instance. This key will be used to remove pending leaving nodes
+            // during entering.
+            var id = "__transition-" + (this._uid) + "-";
+            child.key = child.key == null
+                ? child.isComment
+                    ? id + 'comment'
+                    : id + child.tag
+                : isPrimitive(child.key)
+                    ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
+                    : child.key;
+
+            var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
+            var oldRawChild = this._vnode;
+            var oldChild = getRealChild(oldRawChild);
+
+            // mark v-show
+            // so that the transition module can hand over the control to the directive
+            if (child.data.directives && child.data.directives.some(isVShowDirective)) {
+                child.data.show = true;
+            }
+
+            if (
+                oldChild &&
+                oldChild.data &&
+                !isSameChild(child, oldChild) &&
+                !isAsyncPlaceholder(oldChild) &&
+                // #6687 component root is a comment node
+                !(oldChild.componentInstance && oldChild.componentInstance._vnode.isComment)
+            ) {
+                // replace old child transition data with fresh one
+                // important for dynamic transitions!
+                var oldData = oldChild.data.transition = extend({}, data);
+                // handle transition mode
+                if (mode === 'out-in') {
+                    // return placeholder node and queue update when leave finishes
+                    this._leaving = true;
+                    mergeVNodeHook(oldData, 'afterLeave', function () {
+                        this$1._leaving = false;
+                        this$1.$forceUpdate();
+                    });
+                    return placeholder(h, rawChild)
+                } else if (mode === 'in-out') {
+                    if (isAsyncPlaceholder(child)) {
+                        return oldRawChild
+                    }
+                    var delayedLeave;
+                    var performLeave = function () { delayedLeave(); };
+                    mergeVNodeHook(data, 'afterEnter', performLeave);
+                    mergeVNodeHook(data, 'enterCancelled', performLeave);
+                    mergeVNodeHook(oldData, 'delayLeave', function (leave) { delayedLeave = leave; });
+                }
+            }
+
+            return rawChild
+        }
+    };
+
+    /*  */
+
+    var props = extend({
+        tag: String,
+        moveClass: String
+    }, transitionProps);
+
+    delete props.mode;
+
+    var TransitionGroup = {
+        props: props,
+
+        beforeMount: function beforeMount () {
+            var this$1 = this;
+
+            var update = this._update;
+            this._update = function (vnode, hydrating) {
+                var restoreActiveInstance = setActiveInstance(this$1);
+                // force removing pass
+                this$1.__patch__(
+                    this$1._vnode,
+                    this$1.kept,
+                    false, // hydrating
+                    true // removeOnly (!important, avoids unnecessary moves)
+                );
+                this$1._vnode = this$1.kept;
+                restoreActiveInstance();
+                update.call(this$1, vnode, hydrating);
+            };
+        },
+
+        render: function render (h) {
+            var tag = this.tag || this.$vnode.data.tag || 'span';
+            var map = Object.create(null);
+            var prevChildren = this.prevChildren = this.children;
+            var rawChildren = this.$slots.default || [];
+            var children = this.children = [];
+            var transitionData = extractTransitionData(this);
+
+            for (var i = 0; i < rawChildren.length; i++) {
+                var c = rawChildren[i];
+                if (c.tag) {
+                    if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
+                        children.push(c);
+                        map[c.key] = c
+                        ;(c.data || (c.data = {})).transition = transitionData;
+                    } else {
+                        var opts = c.componentOptions;
+                        var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
+                        warn(("<transition-group> children must be keyed: <" + name + ">"));
+                    }
+                }
+            }
+
+            if (prevChildren) {
+                var kept = [];
+                var removed = [];
+                for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
+                    var c$1 = prevChildren[i$1];
+                    c$1.data.transition = transitionData;
+                    c$1.data.pos = c$1.elm.getBoundingClientRect();
+                    if (map[c$1.key]) {
+                        kept.push(c$1);
+                    } else {
+                        removed.push(c$1);
+                    }
+                }
+                this.kept = h(tag, null, kept);
+                this.removed = removed;
+            }
+
+            return h(tag, null, children)
+        },
+
+        updated: function updated () {
+            var children = this.prevChildren;
+            var moveClass = this.moveClass || ((this.name || 'v') + '-move');
+            if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
+                return
+            }
+
+            // we divide the work into three loops to avoid mixing DOM reads and writes
+            // in each iteration - which helps prevent layout thrashing.
+            children.forEach(callPendingCbs);
+            children.forEach(recordPosition);
+            children.forEach(applyTranslation);
+
+            // force reflow to put everything in position
+            // assign to this to avoid being removed in tree-shaking
+            // $flow-disable-line
+            this._reflow = document.body.offsetHeight;
+
+            children.forEach(function (c) {
+                if (c.data.moved) {
+                    var el = c.elm;
+                    var s = el.style;
+                    addTransitionClass(el, moveClass);
+                    s.transform = s.WebkitTransform = s.transitionDuration = '';
+                    el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {
+                        if (e && e.target !== el) {
+                            return
+                        }
+                        if (!e || /transform$/.test(e.propertyName)) {
+                            el.removeEventListener(transitionEndEvent, cb);
+                            el._moveCb = null;
+                            removeTransitionClass(el, moveClass);
+                        }
+                    });
+                }
+            });
+        },
+
+        methods: {
+            hasMove: function hasMove (el, moveClass) {
+                /* istanbul ignore if */
+                if (!hasTransition) {
+                    return false
+                }
+                /* istanbul ignore if */
+                if (this._hasMove) {
+                    return this._hasMove
+                }
+                // Detect whether an element with the move class applied has
+                // CSS transitions. Since the element may be inside an entering
+                // transition at this very moment, we make a clone of it and remove
+                // all other transition classes applied to ensure only the move class
+                // is applied.
+                var clone = el.cloneNode();
+                if (el._transitionClasses) {
+                    el._transitionClasses.forEach(function (cls) { removeClass(clone, cls); });
+                }
+                addClass(clone, moveClass);
+                clone.style.display = 'none';
+                this.$el.appendChild(clone);
+                var info = getTransitionInfo(clone);
+                this.$el.removeChild(clone);
+                return (this._hasMove = info.hasTransform)
+            }
+        }
+    };
+
+    function callPendingCbs (c) {
+        /* istanbul ignore if */
+        if (c.elm._moveCb) {
+            c.elm._moveCb();
+        }
+        /* istanbul ignore if */
+        if (c.elm._enterCb) {
+            c.elm._enterCb();
+        }
+    }
+
+    function recordPosition (c) {
+        c.data.newPos = c.elm.getBoundingClientRect();
+    }
+
+    function applyTranslation (c) {
+        var oldPos = c.data.pos;
+        var newPos = c.data.newPos;
+        var dx = oldPos.left - newPos.left;
+        var dy = oldPos.top - newPos.top;
+        if (dx || dy) {
+            c.data.moved = true;
+            var s = c.elm.style;
+            s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
+            s.transitionDuration = '0s';
+        }
+    }
+
+    var platformComponents = {
+        Transition: Transition,
+        TransitionGroup: TransitionGroup
+    };
+
+    /*  */
+
+    // install platform specific utils
+    Vue.config.mustUseProp = mustUseProp;
+    Vue.config.isReservedTag = isReservedTag;
+    Vue.config.isReservedAttr = isReservedAttr;
+    Vue.config.getTagNamespace = getTagNamespace;
+    Vue.config.isUnknownElement = isUnknownElement;
+
+    // install platform runtime directives & components
+    extend(Vue.options.directives, platformDirectives);
+    extend(Vue.options.components, platformComponents);
+
+    // install platform patch function
+    Vue.prototype.__patch__ = inBrowser ? patch : noop;
+
+    // public mount method
+    Vue.prototype.$mount = function (
+        el,
+        hydrating
+    ) {
+        el = el && inBrowser ? query(el) : undefined;
+        return mountComponent(this, el, hydrating)
+    };
+
+    // devtools global hook
+    /* istanbul ignore next */
+    if (inBrowser) {
+        setTimeout(function () {
+            if (config.devtools) {
+                if (devtools) {
+                    devtools.emit('init', Vue);
+                } else {
+                    console[console.info ? 'info' : 'log'](
+                        'Download the Vue Devtools extension for a better development experience:\n' +
+                        'https://github.com/vuejs/vue-devtools'
+                    );
+                }
+            }
+            if (config.productionTip !== false &&
+                typeof console !== 'undefined'
+            ) {
+                console[console.info ? 'info' : 'log'](
+                    "You are running Vue in development mode.\n" +
+                    "Make sure to turn on production mode when deploying for production.\n" +
+                    "See more tips at https://vuejs.org/guide/deployment.html"
+                );
+            }
+        }, 0);
+    }
+
+    /*  */
+
+    var defaultTagRE = /\{\{((?:.|\r?\n)+?)\}\}/g;
+    var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;
+
+    var buildRegex = cached(function (delimiters) {
+        var open = delimiters[0].replace(regexEscapeRE, '\\$&');
+        var close = delimiters[1].replace(regexEscapeRE, '\\$&');
+        return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
+    });
+
+
+
+    function parseText (
+        text,
+        delimiters
+    ) {
+        var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
+        if (!tagRE.test(text)) {
+            return
+        }
+        var tokens = [];
+        var rawTokens = [];
+        var lastIndex = tagRE.lastIndex = 0;
+        var match, index, tokenValue;
+        while ((match = tagRE.exec(text))) {
+            index = match.index;
+            // push text token
+            if (index > lastIndex) {
+                rawTokens.push(tokenValue = text.slice(lastIndex, index));
+                tokens.push(JSON.stringify(tokenValue));
+            }
+            // tag token
+            var exp = parseFilters(match[1].trim());
+            tokens.push(("_s(" + exp + ")"));
+            rawTokens.push({ '@binding': exp });
+            lastIndex = index + match[0].length;
+        }
+        if (lastIndex < text.length) {
+            rawTokens.push(tokenValue = text.slice(lastIndex));
+            tokens.push(JSON.stringify(tokenValue));
+        }
+        return {
+            expression: tokens.join('+'),
+            tokens: rawTokens
+        }
+    }
+
+    /*  */
+
+    function transformNode (el, options) {
+        var warn = options.warn || baseWarn;
+        var staticClass = getAndRemoveAttr(el, 'class');
+        if (staticClass) {
+            var res = parseText(staticClass, options.delimiters);
+            if (res) {
+                warn(
+                    "class=\"" + staticClass + "\": " +
+                    'Interpolation inside attributes has been removed. ' +
+                    'Use v-bind or the colon shorthand instead. For example, ' +
+                    'instead of <div class="{{ val }}">, use <div :class="val">.',
+                    el.rawAttrsMap['class']
+                );
+            }
+        }
+        if (staticClass) {
+            el.staticClass = JSON.stringify(staticClass);
+        }
+        var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
+        if (classBinding) {
+            el.classBinding = classBinding;
+        }
+    }
+
+    function genData (el) {
+        var data = '';
+        if (el.staticClass) {
+            data += "staticClass:" + (el.staticClass) + ",";
+        }
+        if (el.classBinding) {
+            data += "class:" + (el.classBinding) + ",";
+        }
+        return data
+    }
+
+    var klass$1 = {
+        staticKeys: ['staticClass'],
+        transformNode: transformNode,
+        genData: genData
+    };
+
+    /*  */
+
+    function transformNode$1 (el, options) {
+        var warn = options.warn || baseWarn;
+        var staticStyle = getAndRemoveAttr(el, 'style');
+        if (staticStyle) {
+            /* istanbul ignore if */
+            {
+                var res = parseText(staticStyle, options.delimiters);
+                if (res) {
+                    warn(
+                        "style=\"" + staticStyle + "\": " +
+                        'Interpolation inside attributes has been removed. ' +
+                        'Use v-bind or the colon shorthand instead. For example, ' +
+                        'instead of <div style="{{ val }}">, use <div :style="val">.',
+                        el.rawAttrsMap['style']
+                    );
+                }
+            }
+            el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
+        }
+
+        var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
+        if (styleBinding) {
+            el.styleBinding = styleBinding;
+        }
+    }
+
+    function genData$1 (el) {
+        var data = '';
+        if (el.staticStyle) {
+            data += "staticStyle:" + (el.staticStyle) + ",";
+        }
+        if (el.styleBinding) {
+            data += "style:(" + (el.styleBinding) + "),";
+        }
+        return data
+    }
+
+    var style$1 = {
+        staticKeys: ['staticStyle'],
+        transformNode: transformNode$1,
+        genData: genData$1
+    };
+
+    /*  */
+
+    var decoder;
+
+    var he = {
+        decode: function decode (html) {
+            decoder = decoder || document.createElement('div');
+            decoder.innerHTML = html;
+            return decoder.textContent
+        }
+    };
+
+    /*  */
+
+    var isUnaryTag = makeMap(
+        'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
+        'link,meta,param,source,track,wbr'
+    );
+
+    // Elements that you can, intentionally, leave open
+    // (and which close themselves)
+    var canBeLeftOpenTag = makeMap(
+        'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
+    );
+
+    // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
+    // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
+    var isNonPhrasingTag = makeMap(
+        'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
+        'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
+        'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
+        'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
+        'title,tr,track'
+    );
+
+    /**
+     * Not type-checking this file because it's mostly vendor code.
+     */
+
+        // Regular Expressions for parsing tags and attributes
+    var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
+    var dynamicArgAttribute = /^\s*((?:v-[\w-]+:|@|:|#)\[[^=]+?\][^\s"'<>\/=]*)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
+    var ncname = "[a-zA-Z_][\\-\\.0-9_a-zA-Z" + (unicodeRegExp.source) + "]*";
+    var qnameCapture = "((?:" + ncname + "\\:)?" + ncname + ")";
+    var startTagOpen = new RegExp(("^<" + qnameCapture));
+    var startTagClose = /^\s*(\/?)>/;
+    var endTag = new RegExp(("^<\\/" + qnameCapture + "[^>]*>"));
+    var doctype = /^<!DOCTYPE [^>]+>/i;
+    // #7298: escape - to avoid being passed as HTML comment when inlined in page
+    var comment = /^<!\--/;
+    var conditionalComment = /^<!\[/;
+
+    // Special Elements (can contain anything)
+    var isPlainTextElement = makeMap('script,style,textarea', true);
+    var reCache = {};
+
+    var decodingMap = {
+        '&lt;': '<',
+        '&gt;': '>',
+        '&quot;': '"',
+        '&amp;': '&',
+        '&#10;': '\n',
+        '&#9;': '\t',
+        '&#39;': "'"
+    };
+    var encodedAttr = /&(?:lt|gt|quot|amp|#39);/g;
+    var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#39|#10|#9);/g;
+
+    // #5992
+    var isIgnoreNewlineTag = makeMap('pre,textarea', true);
+    var shouldIgnoreFirstNewline = function (tag, html) { return tag && isIgnoreNewlineTag(tag) && html[0] === '\n'; };
+
+    function decodeAttr (value, shouldDecodeNewlines) {
+        var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
+        return value.replace(re, function (match) { return decodingMap[match]; })
+    }
+
+    function parseHTML (html, options) {
+        var stack = [];
+        var expectHTML = options.expectHTML;
+        var isUnaryTag$$1 = options.isUnaryTag || no;
+        var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
+        var index = 0;
+        var last, lastTag;
+        while (html) {
+            last = html;
+            // Make sure we're not in a plaintext content element like script/style
+            if (!lastTag || !isPlainTextElement(lastTag)) {
+                var textEnd = html.indexOf('<');
+                if (textEnd === 0) {
+                    // Comment:
+                    if (comment.test(html)) {
+                        var commentEnd = html.indexOf('-->');
+
+                        if (commentEnd >= 0) {
+                            if (options.shouldKeepComment) {
+                                options.comment(html.substring(4, commentEnd), index, index + commentEnd + 3);
+                            }
+                            advance(commentEnd + 3);
+                            continue
+                        }
+                    }
+
+                    // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
+                    if (conditionalComment.test(html)) {
+                        var conditionalEnd = html.indexOf(']>');
+
+                        if (conditionalEnd >= 0) {
+                            advance(conditionalEnd + 2);
+                            continue
+                        }
+                    }
+
+                    // Doctype:
+                    var doctypeMatch = html.match(doctype);
+                    if (doctypeMatch) {
+                        advance(doctypeMatch[0].length);
+                        continue
+                    }
+
+                    // End tag:
+                    var endTagMatch = html.match(endTag);
+                    if (endTagMatch) {
+                        var curIndex = index;
+                        advance(endTagMatch[0].length);
+                        parseEndTag(endTagMatch[1], curIndex, index);
+                        continue
+                    }
+
+                    // Start tag:
+                    var startTagMatch = parseStartTag();
+                    if (startTagMatch) {
+                        handleStartTag(startTagMatch);
+                        if (shouldIgnoreFirstNewline(startTagMatch.tagName, html)) {
+                            advance(1);
+                        }
+                        continue
+                    }
+                }
+
+                var text = (void 0), rest = (void 0), next = (void 0);
+                if (textEnd >= 0) {
+                    rest = html.slice(textEnd);
+                    while (
+                        !endTag.test(rest) &&
+                        !startTagOpen.test(rest) &&
+                        !comment.test(rest) &&
+                        !conditionalComment.test(rest)
+                        ) {
+                        // < in plain text, be forgiving and treat it as text
+                        next = rest.indexOf('<', 1);
+                        if (next < 0) { break }
+                        textEnd += next;
+                        rest = html.slice(textEnd);
+                    }
+                    text = html.substring(0, textEnd);
+                }
+
+                if (textEnd < 0) {
+                    text = html;
+                }
+
+                if (text) {
+                    advance(text.length);
+                }
+
+                if (options.chars && text) {
+                    options.chars(text, index - text.length, index);
+                }
+            } else {
+                var endTagLength = 0;
+                var stackedTag = lastTag.toLowerCase();
+                var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
+                var rest$1 = html.replace(reStackedTag, function (all, text, endTag) {
+                    endTagLength = endTag.length;
+                    if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
+                        text = text
+                            .replace(/<!\--([\s\S]*?)-->/g, '$1') // #7298
+                            .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
+                    }
+                    if (shouldIgnoreFirstNewline(stackedTag, text)) {
+                        text = text.slice(1);
+                    }
+                    if (options.chars) {
+                        options.chars(text);
+                    }
+                    return ''
+                });
+                index += html.length - rest$1.length;
+                html = rest$1;
+                parseEndTag(stackedTag, index - endTagLength, index);
+            }
+
+            if (html === last) {
+                options.chars && options.chars(html);
+                if (!stack.length && options.warn) {
+                    options.warn(("Mal-formatted tag at end of template: \"" + html + "\""), { start: index + html.length });
+                }
+                break
+            }
+        }
+
+        // Clean up any remaining tags
+        parseEndTag();
+
+        function advance (n) {
+            index += n;
+            html = html.substring(n);
+        }
+
+        function parseStartTag () {
+            var start = html.match(startTagOpen);
+            if (start) {
+                var match = {
+                    tagName: start[1],
+                    attrs: [],
+                    start: index
+                };
+                advance(start[0].length);
+                var end, attr;
+                while (!(end = html.match(startTagClose)) && (attr = html.match(dynamicArgAttribute) || html.match(attribute))) {
+                    attr.start = index;
+                    advance(attr[0].length);
+                    attr.end = index;
+                    match.attrs.push(attr);
+                }
+                if (end) {
+                    match.unarySlash = end[1];
+                    advance(end[0].length);
+                    match.end = index;
+                    return match
+                }
+            }
+        }
+
+        function handleStartTag (match) {
+            var tagName = match.tagName;
+            var unarySlash = match.unarySlash;
+
+            if (expectHTML) {
+                if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
+                    parseEndTag(lastTag);
+                }
+                if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
+                    parseEndTag(tagName);
+                }
+            }
+
+            var unary = isUnaryTag$$1(tagName) || !!unarySlash;
+
+            var l = match.attrs.length;
+            var attrs = new Array(l);
+            for (var i = 0; i < l; i++) {
+                var args = match.attrs[i];
+                var value = args[3] || args[4] || args[5] || '';
+                var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href'
+                    ? options.shouldDecodeNewlinesForHref
+                    : options.shouldDecodeNewlines;
+                attrs[i] = {
+                    name: args[1],
+                    value: decodeAttr(value, shouldDecodeNewlines)
+                };
+                if (options.outputSourceRange) {
+                    attrs[i].start = args.start + args[0].match(/^\s*/).length;
+                    attrs[i].end = args.end;
+                }
+            }
+
+            if (!unary) {
+                stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs, start: match.start, end: match.end });
+                lastTag = tagName;
+            }
+
+            if (options.start) {
+                options.start(tagName, attrs, unary, match.start, match.end);
+            }
+        }
+
+        function parseEndTag (tagName, start, end) {
+            var pos, lowerCasedTagName;
+            if (start == null) { start = index; }
+            if (end == null) { end = index; }
+
+            // Find the closest opened tag of the same type
+            if (tagName) {
+                lowerCasedTagName = tagName.toLowerCase();
+                for (pos = stack.length - 1; pos >= 0; pos--) {
+                    if (stack[pos].lowerCasedTag === lowerCasedTagName) {
+                        break
+                    }
+                }
+            } else {
+                // If no tag name is provided, clean shop
+                pos = 0;
+            }
+
+            if (pos >= 0) {
+                // Close all the open elements, up the stack
+                for (var i = stack.length - 1; i >= pos; i--) {
+                    if (i > pos || !tagName &&
+                        options.warn
+                    ) {
+                        options.warn(
+                            ("tag <" + (stack[i].tag) + "> has no matching end tag."),
+                            { start: stack[i].start, end: stack[i].end }
+                        );
+                    }
+                    if (options.end) {
+                        options.end(stack[i].tag, start, end);
+                    }
+                }
+
+                // Remove the open elements from the stack
+                stack.length = pos;
+                lastTag = pos && stack[pos - 1].tag;
+            } else if (lowerCasedTagName === 'br') {
+                if (options.start) {
+                    options.start(tagName, [], true, start, end);
+                }
+            } else if (lowerCasedTagName === 'p') {
+                if (options.start) {
+                    options.start(tagName, [], false, start, end);
+                }
+                if (options.end) {
+                    options.end(tagName, start, end);
+                }
+            }
+        }
+    }
+
+    /*  */
+
+    var onRE = /^@|^v-on:/;
+    var dirRE = /^v-|^@|^:|^#/;
+    var forAliasRE = /([\s\S]*?)\s+(?:in|of)\s+([\s\S]*)/;
+    var forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/;
+    var stripParensRE = /^\(|\)$/g;
+    var dynamicArgRE = /^\[.*\]$/;
+
+    var argRE = /:(.*)$/;
+    var bindRE = /^:|^\.|^v-bind:/;
+    var modifierRE = /\.[^.\]]+(?=[^\]]*$)/g;
+
+    var slotRE = /^v-slot(:|$)|^#/;
+
+    var lineBreakRE = /[\r\n]/;
+    var whitespaceRE$1 = /[ \f\t\r\n]+/g;
+
+    var invalidAttributeRE = /[\s"'<>\/=]/;
+
+    var decodeHTMLCached = cached(he.decode);
+
+    var emptySlotScopeToken = "_empty_";
+
+    // configurable state
+    var warn$2;
+    var delimiters;
+    var transforms;
+    var preTransforms;
+    var postTransforms;
+    var platformIsPreTag;
+    var platformMustUseProp;
+    var platformGetTagNamespace;
+    var maybeComponent;
+
+    function createASTElement (
+        tag,
+        attrs,
+        parent
+    ) {
+        return {
+            type: 1,
+            tag: tag,
+            attrsList: attrs,
+            attrsMap: makeAttrsMap(attrs),
+            rawAttrsMap: {},
+            parent: parent,
+            children: []
+        }
+    }
+
+    /**
+     * Convert HTML string to AST.
+     */
+    function parse (
+        template,
+        options
+    ) {
+        warn$2 = options.warn || baseWarn;
+
+        platformIsPreTag = options.isPreTag || no;
+        platformMustUseProp = options.mustUseProp || no;
+        platformGetTagNamespace = options.getTagNamespace || no;
+        var isReservedTag = options.isReservedTag || no;
+        maybeComponent = function (el) { return !!(
+            el.component ||
+            el.attrsMap[':is'] ||
+            el.attrsMap['v-bind:is'] ||
+            !(el.attrsMap.is ? isReservedTag(el.attrsMap.is) : isReservedTag(el.tag))
+        ); };
+        transforms = pluckModuleFunction(options.modules, 'transformNode');
+        preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
+        postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');
+
+        delimiters = options.delimiters;
+
+        var stack = [];
+        var preserveWhitespace = options.preserveWhitespace !== false;
+        var whitespaceOption = options.whitespace;
+        var root;
+        var currentParent;
+        var inVPre = false;
+        var inPre = false;
+        var warned = false;
+
+        function warnOnce (msg, range) {
+            if (!warned) {
+                warned = true;
+                warn$2(msg, range);
+            }
+        }
+
+        function closeElement (element) {
+            trimEndingWhitespace(element);
+            if (!inVPre && !element.processed) {
+                element = processElement(element, options);
+            }
+            // tree management
+            if (!stack.length && element !== root) {
+                // allow root elements with v-if, v-else-if and v-else
+                if (root.if && (element.elseif || element.else)) {
+                    {
+                        checkRootConstraints(element);
+                    }
+                    addIfCondition(root, {
+                        exp: element.elseif,
+                        block: element
+                    });
+                } else {
+                    warnOnce(
+                        "Component template should contain exactly one root element. " +
+                        "If you are using v-if on multiple elements, " +
+                        "use v-else-if to chain them instead.",
+                        { start: element.start }
+                    );
+                }
+            }
+            if (currentParent && !element.forbidden) {
+                if (element.elseif || element.else) {
+                    processIfConditions(element, currentParent);
+                } else {
+                    if (element.slotScope) {
+                        // scoped slot
+                        // keep it in the children list so that v-else(-if) conditions can
+                        // find it as the prev node.
+                        var name = element.slotTarget || '"default"'
+                        ;(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
+                    }
+                    currentParent.children.push(element);
+                    element.parent = currentParent;
+                }
+            }
+
+            // final children cleanup
+            // filter out scoped slots
+            element.children = element.children.filter(function (c) { return !(c).slotScope; });
+            // remove trailing whitespace node again
+            trimEndingWhitespace(element);
+
+            // check pre state
+            if (element.pre) {
+                inVPre = false;
+            }
+            if (platformIsPreTag(element.tag)) {
+                inPre = false;
+            }
+            // apply post-transforms
+            for (var i = 0; i < postTransforms.length; i++) {
+                postTransforms[i](element, options);
+            }
+        }
+
+        function trimEndingWhitespace (el) {
+            // remove trailing whitespace node
+            if (!inPre) {
+                var lastNode;
+                while (
+                    (lastNode = el.children[el.children.length - 1]) &&
+                    lastNode.type === 3 &&
+                    lastNode.text === ' '
+                    ) {
+                    el.children.pop();
+                }
+            }
+        }
+
+        function checkRootConstraints (el) {
+            if (el.tag === 'slot' || el.tag === 'template') {
+                warnOnce(
+                    "Cannot use <" + (el.tag) + "> as component root element because it may " +
+                    'contain multiple nodes.',
+                    { start: el.start }
+                );
+            }
+            if (el.attrsMap.hasOwnProperty('v-for')) {
+                warnOnce(
+                    'Cannot use v-for on stateful component root element because ' +
+                    'it renders multiple elements.',
+                    el.rawAttrsMap['v-for']
+                );
+            }
+        }
+
+        parseHTML(template, {
+            warn: warn$2,
+            expectHTML: options.expectHTML,
+            isUnaryTag: options.isUnaryTag,
+            canBeLeftOpenTag: options.canBeLeftOpenTag,
+            shouldDecodeNewlines: options.shouldDecodeNewlines,
+            shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
+            shouldKeepComment: options.comments,
+            outputSourceRange: options.outputSourceRange,
+            start: function start (tag, attrs, unary, start$1, end) {
+                // check namespace.
+                // inherit parent ns if there is one
+                var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);
+
+                // handle IE svg bug
+                /* istanbul ignore if */
+                if (isIE && ns === 'svg') {
+                    attrs = guardIESVGBug(attrs);
+                }
+
+                var element = createASTElement(tag, attrs, currentParent);
+                if (ns) {
+                    element.ns = ns;
+                }
+
+                {
+                    if (options.outputSourceRange) {
+                        element.start = start$1;
+                        element.end = end;
+                        element.rawAttrsMap = element.attrsList.reduce(function (cumulated, attr) {
+                            cumulated[attr.name] = attr;
+                            return cumulated
+                        }, {});
+                    }
+                    attrs.forEach(function (attr) {
+                        if (invalidAttributeRE.test(attr.name)) {
+                            warn$2(
+                                "Invalid dynamic argument expression: attribute names cannot contain " +
+                                "spaces, quotes, <, >, / or =.",
+                                {
+                                    start: attr.start + attr.name.indexOf("["),
+                                    end: attr.start + attr.name.length
+                                }
+                            );
+                        }
+                    });
+                }
+
+                if (isForbiddenTag(element) && !isServerRendering()) {
+                    element.forbidden = true;
+                    warn$2(
+                        'Templates should only be responsible for mapping the state to the ' +
+                        'UI. Avoid placing tags with side-effects in your templates, such as ' +
+                        "<" + tag + ">" + ', as they will not be parsed.',
+                        { start: element.start }
+                    );
+                }
+
+                // apply pre-transforms
+                for (var i = 0; i < preTransforms.length; i++) {
+                    element = preTransforms[i](element, options) || element;
+                }
+
+                if (!inVPre) {
+                    processPre(element);
+                    if (element.pre) {
+                        inVPre = true;
+                    }
+                }
+                if (platformIsPreTag(element.tag)) {
+                    inPre = true;
+                }
+                if (inVPre) {
+                    processRawAttrs(element);
+                } else if (!element.processed) {
+                    // structural directives
+                    processFor(element);
+                    processIf(element);
+                    processOnce(element);
+                }
+
+                if (!root) {
+                    root = element;
+                    {
+                        checkRootConstraints(root);
+                    }
+                }
+
+                if (!unary) {
+                    currentParent = element;
+                    stack.push(element);
+                } else {
+                    closeElement(element);
+                }
+            },
+
+            end: function end (tag, start, end$1) {
+                var element = stack[stack.length - 1];
+                // pop stack
+                stack.length -= 1;
+                currentParent = stack[stack.length - 1];
+                if (options.outputSourceRange) {
+                    element.end = end$1;
+                }
+                closeElement(element);
+            },
+
+            chars: function chars (text, start, end) {
+                if (!currentParent) {
+                    {
+                        if (text === template) {
+                            warnOnce(
+                                'Component template requires a root element, rather than just text.',
+                                { start: start }
+                            );
+                        } else if ((text = text.trim())) {
+                            warnOnce(
+                                ("text \"" + text + "\" outside root element will be ignored."),
+                                { start: start }
+                            );
+                        }
+                    }
+                    return
+                }
+                // IE textarea placeholder bug
+                /* istanbul ignore if */
+                if (isIE &&
+                    currentParent.tag === 'textarea' &&
+                    currentParent.attrsMap.placeholder === text
+                ) {
+                    return
+                }
+                var children = currentParent.children;
+                if (inPre || text.trim()) {
+                    text = isTextTag(currentParent) ? text : decodeHTMLCached(text);
+                } else if (!children.length) {
+                    // remove the whitespace-only node right after an opening tag
+                    text = '';
+                } else if (whitespaceOption) {
+                    if (whitespaceOption === 'condense') {
+                        // in condense mode, remove the whitespace node if it contains
+                        // line break, otherwise condense to a single space
+                        text = lineBreakRE.test(text) ? '' : ' ';
+                    } else {
+                        text = ' ';
+                    }
+                } else {
+                    text = preserveWhitespace ? ' ' : '';
+                }
+                if (text) {
+                    if (!inPre && whitespaceOption === 'condense') {
+                        // condense consecutive whitespaces into single space
+                        text = text.replace(whitespaceRE$1, ' ');
+                    }
+                    var res;
+                    var child;
+                    if (!inVPre && text !== ' ' && (res = parseText(text, delimiters))) {
+                        child = {
+                            type: 2,
+                            expression: res.expression,
+                            tokens: res.tokens,
+                            text: text
+                        };
+                    } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
+                        child = {
+                            type: 3,
+                            text: text
+                        };
+                    }
+                    if (child) {
+                        if (options.outputSourceRange) {
+                            child.start = start;
+                            child.end = end;
+                        }
+                        children.push(child);
+                    }
+                }
+            },
+            comment: function comment (text, start, end) {
+                // adding anything as a sibling to the root node is forbidden
+                // comments should still be allowed, but ignored
+                if (currentParent) {
+                    var child = {
+                        type: 3,
+                        text: text,
+                        isComment: true
+                    };
+                    if (options.outputSourceRange) {
+                        child.start = start;
+                        child.end = end;
+                    }
+                    currentParent.children.push(child);
+                }
+            }
+        });
+        return root
+    }
+
+    function processPre (el) {
+        if (getAndRemoveAttr(el, 'v-pre') != null) {
+            el.pre = true;
+        }
+    }
+
+    function processRawAttrs (el) {
+        var list = el.attrsList;
+        var len = list.length;
+        if (len) {
+            var attrs = el.attrs = new Array(len);
+            for (var i = 0; i < len; i++) {
+                attrs[i] = {
+                    name: list[i].name,
+                    value: JSON.stringify(list[i].value)
+                };
+                if (list[i].start != null) {
+                    attrs[i].start = list[i].start;
+                    attrs[i].end = list[i].end;
+                }
+            }
+        } else if (!el.pre) {
+            // non root node in pre blocks with no attributes
+            el.plain = true;
+        }
+    }
+
+    function processElement (
+        element,
+        options
+    ) {
+        processKey(element);
+
+        // determine whether this is a plain element after
+        // removing structural attributes
+        element.plain = (
+            !element.key &&
+            !element.scopedSlots &&
+            !element.attrsList.length
+        );
+
+        processRef(element);
+        processSlotContent(element);
+        processSlotOutlet(element);
+        processComponent(element);
+        for (var i = 0; i < transforms.length; i++) {
+            element = transforms[i](element, options) || element;
+        }
+        processAttrs(element);
+        return element
+    }
+
+    function processKey (el) {
+        var exp = getBindingAttr(el, 'key');
+        if (exp) {
+            {
+                if (el.tag === 'template') {
+                    warn$2(
+                        "<template> cannot be keyed. Place the key on real elements instead.",
+                        getRawBindingAttr(el, 'key')
+                    );
+                }
+                if (el.for) {
+                    var iterator = el.iterator2 || el.iterator1;
+                    var parent = el.parent;
+                    if (iterator && iterator === exp && parent && parent.tag === 'transition-group') {
+                        warn$2(
+                            "Do not use v-for index as key on <transition-group> children, " +
+                            "this is the same as not using keys.",
+                            getRawBindingAttr(el, 'key'),
+                            true /* tip */
+                        );
+                    }
+                }
+            }
+            el.key = exp;
+        }
+    }
+
+    function processRef (el) {
+        var ref = getBindingAttr(el, 'ref');
+        if (ref) {
+            el.ref = ref;
+            el.refInFor = checkInFor(el);
+        }
+    }
+
+    function processFor (el) {
+        var exp;
+        if ((exp = getAndRemoveAttr(el, 'v-for'))) {
+            var res = parseFor(exp);
+            if (res) {
+                extend(el, res);
+            } else {
+                warn$2(
+                    ("Invalid v-for expression: " + exp),
+                    el.rawAttrsMap['v-for']
+                );
+            }
+        }
+    }
+
+
+
+    function parseFor (exp) {
+        var inMatch = exp.match(forAliasRE);
+        if (!inMatch) { return }
+        var res = {};
+        res.for = inMatch[2].trim();
+        var alias = inMatch[1].trim().replace(stripParensRE, '');
+        var iteratorMatch = alias.match(forIteratorRE);
+        if (iteratorMatch) {
+            res.alias = alias.replace(forIteratorRE, '').trim();
+            res.iterator1 = iteratorMatch[1].trim();
+            if (iteratorMatch[2]) {
+                res.iterator2 = iteratorMatch[2].trim();
+            }
+        } else {
+            res.alias = alias;
+        }
+        return res
+    }
+
+    function processIf (el) {
+        var exp = getAndRemoveAttr(el, 'v-if');
+        if (exp) {
+            el.if = exp;
+            addIfCondition(el, {
+                exp: exp,
+                block: el
+            });
+        } else {
+            if (getAndRemoveAttr(el, 'v-else') != null) {
+                el.else = true;
+            }
+            var elseif = getAndRemoveAttr(el, 'v-else-if');
+            if (elseif) {
+                el.elseif = elseif;
+            }
+        }
+    }
+
+    function processIfConditions (el, parent) {
+        var prev = findPrevElement(parent.children);
+        if (prev && prev.if) {
+            addIfCondition(prev, {
+                exp: el.elseif,
+                block: el
+            });
+        } else {
+            warn$2(
+                "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
+                "used on element <" + (el.tag) + "> without corresponding v-if.",
+                el.rawAttrsMap[el.elseif ? 'v-else-if' : 'v-else']
+            );
+        }
+    }
+
+    function findPrevElement (children) {
+        var i = children.length;
+        while (i--) {
+            if (children[i].type === 1) {
+                return children[i]
+            } else {
+                if (children[i].text !== ' ') {
+                    warn$2(
+                        "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
+                        "will be ignored.",
+                        children[i]
+                    );
+                }
+                children.pop();
+            }
+        }
+    }
+
+    function addIfCondition (el, condition) {
+        if (!el.ifConditions) {
+            el.ifConditions = [];
+        }
+        el.ifConditions.push(condition);
+    }
+
+    function processOnce (el) {
+        var once$$1 = getAndRemoveAttr(el, 'v-once');
+        if (once$$1 != null) {
+            el.once = true;
+        }
+    }
+
+    // handle content being passed to a component as slot,
+    // e.g. <template slot="xxx">, <div slot-scope="xxx">
+    function processSlotContent (el) {
+        var slotScope;
+        if (el.tag === 'template') {
+            slotScope = getAndRemoveAttr(el, 'scope');
+            /* istanbul ignore if */
+            if (slotScope) {
+                warn$2(
+                    "the \"scope\" attribute for scoped slots have been deprecated and " +
+                    "replaced by \"slot-scope\" since 2.5. The new \"slot-scope\" attribute " +
+                    "can also be used on plain elements in addition to <template> to " +
+                    "denote scoped slots.",
+                    el.rawAttrsMap['scope'],
+                    true
+                );
+            }
+            el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
+        } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
+            /* istanbul ignore if */
+            if (el.attrsMap['v-for']) {
+                warn$2(
+                    "Ambiguous combined usage of slot-scope and v-for on <" + (el.tag) + "> " +
+                    "(v-for takes higher priority). Use a wrapper <template> for the " +
+                    "scoped slot to make it clearer.",
+                    el.rawAttrsMap['slot-scope'],
+                    true
+                );
+            }
+            el.slotScope = slotScope;
+        }
+
+        // slot="xxx"
+        var slotTarget = getBindingAttr(el, 'slot');
+        if (slotTarget) {
+            el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
+            el.slotTargetDynamic = !!(el.attrsMap[':slot'] || el.attrsMap['v-bind:slot']);
+            // preserve slot as an attribute for native shadow DOM compat
+            // only for non-scoped slots.
+            if (el.tag !== 'template' && !el.slotScope) {
+                addAttr(el, 'slot', slotTarget, getRawBindingAttr(el, 'slot'));
+            }
+        }
+
+        // 2.6 v-slot syntax
+        {
+            if (el.tag === 'template') {
+                // v-slot on <template>
+                var slotBinding = getAndRemoveAttrByRegex(el, slotRE);
+                if (slotBinding) {
+                    {
+                        if (el.slotTarget || el.slotScope) {
+                            warn$2(
+                                "Unexpected mixed usage of different slot syntaxes.",
+                                el
+                            );
+                        }
+                        if (el.parent && !maybeComponent(el.parent)) {
+                            warn$2(
+                                "<template v-slot> can only appear at the root level inside " +
+                                "the receiving component",
+                                el
+                            );
+                        }
+                    }
+                    var ref = getSlotName(slotBinding);
+                    var name = ref.name;
+                    var dynamic = ref.dynamic;
+                    el.slotTarget = name;
+                    el.slotTargetDynamic = dynamic;
+                    el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
+                }
+            } else {
+                // v-slot on component, denotes default slot
+                var slotBinding$1 = getAndRemoveAttrByRegex(el, slotRE);
+                if (slotBinding$1) {
+                    {
+                        if (!maybeComponent(el)) {
+                            warn$2(
+                                "v-slot can only be used on components or <template>.",
+                                slotBinding$1
+                            );
+                        }
+                        if (el.slotScope || el.slotTarget) {
+                            warn$2(
+                                "Unexpected mixed usage of different slot syntaxes.",
+                                el
+                            );
+                        }
+                        if (el.scopedSlots) {
+                            warn$2(
+                                "To avoid scope ambiguity, the default slot should also use " +
+                                "<template> syntax when there are other named slots.",
+                                slotBinding$1
+                            );
+                        }
+                    }
+                    // add the component's children to its default slot
+                    var slots = el.scopedSlots || (el.scopedSlots = {});
+                    var ref$1 = getSlotName(slotBinding$1);
+                    var name$1 = ref$1.name;
+                    var dynamic$1 = ref$1.dynamic;
+                    var slotContainer = slots[name$1] = createASTElement('template', [], el);
+                    slotContainer.slotTarget = name$1;
+                    slotContainer.slotTargetDynamic = dynamic$1;
+                    slotContainer.children = el.children.filter(function (c) {
+                        if (!c.slotScope) {
+                            c.parent = slotContainer;
+                            return true
+                        }
+                    });
+                    slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
+                    // remove children as they are returned from scopedSlots now
+                    el.children = [];
+                    // mark el non-plain so data gets generated
+                    el.plain = false;
+                }
+            }
+        }
+    }
+
+    function getSlotName (binding) {
+        var name = binding.name.replace(slotRE, '');
+        if (!name) {
+            if (binding.name[0] !== '#') {
+                name = 'default';
+            } else {
+                warn$2(
+                    "v-slot shorthand syntax requires a slot name.",
+                    binding
+                );
+            }
+        }
+        return dynamicArgRE.test(name)
+            // dynamic [name]
+            ? { name: name.slice(1, -1), dynamic: true }
+            // static name
+            : { name: ("\"" + name + "\""), dynamic: false }
+    }
+
+    // handle <slot/> outlets
+    function processSlotOutlet (el) {
+        if (el.tag === 'slot') {
+            el.slotName = getBindingAttr(el, 'name');
+            if (el.key) {
+                warn$2(
+                    "`key` does not work on <slot> because slots are abstract outlets " +
+                    "and can possibly expand into multiple elements. " +
+                    "Use the key on a wrapping element instead.",
+                    getRawBindingAttr(el, 'key')
+                );
+            }
+        }
+    }
+
+    function processComponent (el) {
+        var binding;
+        if ((binding = getBindingAttr(el, 'is'))) {
+            el.component = binding;
+        }
+        if (getAndRemoveAttr(el, 'inline-template') != null) {
+            el.inlineTemplate = true;
+        }
+    }
+
+    function processAttrs (el) {
+        var list = el.attrsList;
+        var i, l, name, rawName, value, modifiers, syncGen, isDynamic;
+        for (i = 0, l = list.length; i < l; i++) {
+            name = rawName = list[i].name;
+            value = list[i].value;
+            if (dirRE.test(name)) {
+                // mark element as dynamic
+                el.hasBindings = true;
+                // modifiers
+                modifiers = parseModifiers(name.replace(dirRE, ''));
+                // support .foo shorthand syntax for the .prop modifier
+                if (modifiers) {
+                    name = name.replace(modifierRE, '');
+                }
+                if (bindRE.test(name)) { // v-bind
+                    name = name.replace(bindRE, '');
+                    value = parseFilters(value);
+                    isDynamic = dynamicArgRE.test(name);
+                    if (isDynamic) {
+                        name = name.slice(1, -1);
+                    }
+                    if (
+                        value.trim().length === 0
+                    ) {
+                        warn$2(
+                            ("The value for a v-bind expression cannot be empty. Found in \"v-bind:" + name + "\"")
+                        );
+                    }
+                    if (modifiers) {
+                        if (modifiers.prop && !isDynamic) {
+                            name = camelize(name);
+                            if (name === 'innerHtml') { name = 'innerHTML'; }
+                        }
+                        if (modifiers.camel && !isDynamic) {
+                            name = camelize(name);
+                        }
+                        if (modifiers.sync) {
+                            syncGen = genAssignmentCode(value, "$event");
+                            if (!isDynamic) {
+                                addHandler(
+                                    el,
+                                    ("update:" + (camelize(name))),
+                                    syncGen,
+                                    null,
+                                    false,
+                                    warn$2,
+                                    list[i]
+                                );
+                                if (hyphenate(name) !== camelize(name)) {
+                                    addHandler(
+                                        el,
+                                        ("update:" + (hyphenate(name))),
+                                        syncGen,
+                                        null,
+                                        false,
+                                        warn$2,
+                                        list[i]
+                                    );
+                                }
+                            } else {
+                                // handler w/ dynamic event name
+                                addHandler(
+                                    el,
+                                    ("\"update:\"+(" + name + ")"),
+                                    syncGen,
+                                    null,
+                                    false,
+                                    warn$2,
+                                    list[i],
+                                    true // dynamic
+                                );
+                            }
+                        }
+                    }
+                    if ((modifiers && modifiers.prop) || (
+                        !el.component && platformMustUseProp(el.tag, el.attrsMap.type, name)
+                    )) {
+                        addProp(el, name, value, list[i], isDynamic);
+                    } else {
+                        addAttr(el, name, value, list[i], isDynamic);
+                    }
+                } else if (onRE.test(name)) { // v-on
+                    name = name.replace(onRE, '');
+                    isDynamic = dynamicArgRE.test(name);
+                    if (isDynamic) {
+                        name = name.slice(1, -1);
+                    }
+                    addHandler(el, name, value, modifiers, false, warn$2, list[i], isDynamic);
+                } else { // normal directives
+                    name = name.replace(dirRE, '');
+                    // parse arg
+                    var argMatch = name.match(argRE);
+                    var arg = argMatch && argMatch[1];
+                    isDynamic = false;
+                    if (arg) {
+                        name = name.slice(0, -(arg.length + 1));
+                        if (dynamicArgRE.test(arg)) {
+                            arg = arg.slice(1, -1);
+                            isDynamic = true;
+                        }
+                    }
+                    addDirective(el, name, rawName, value, arg, isDynamic, modifiers, list[i]);
+                    if (name === 'model') {
+                        checkForAliasModel(el, value);
+                    }
+                }
+            } else {
+                // literal attribute
+                {
+                    var res = parseText(value, delimiters);
+                    if (res) {
+                        warn$2(
+                            name + "=\"" + value + "\": " +
+                            'Interpolation inside attributes has been removed. ' +
+                            'Use v-bind or the colon shorthand instead. For example, ' +
+                            'instead of <div id="{{ val }}">, use <div :id="val">.',
+                            list[i]
+                        );
+                    }
+                }
+                addAttr(el, name, JSON.stringify(value), list[i]);
+                // #6887 firefox doesn't update muted state if set via attribute
+                // even immediately after element creation
+                if (!el.component &&
+                    name === 'muted' &&
+                    platformMustUseProp(el.tag, el.attrsMap.type, name)) {
+                    addProp(el, name, 'true', list[i]);
+                }
+            }
+        }
+    }
+
+    function checkInFor (el) {
+        var parent = el;
+        while (parent) {
+            if (parent.for !== undefined) {
+                return true
+            }
+            parent = parent.parent;
+        }
+        return false
+    }
+
+    function parseModifiers (name) {
+        var match = name.match(modifierRE);
+        if (match) {
+            var ret = {};
+            match.forEach(function (m) { ret[m.slice(1)] = true; });
+            return ret
+        }
+    }
+
+    function makeAttrsMap (attrs) {
+        var map = {};
+        for (var i = 0, l = attrs.length; i < l; i++) {
+            if (
+                map[attrs[i].name] && !isIE && !isEdge
+            ) {
+                warn$2('duplicate attribute: ' + attrs[i].name, attrs[i]);
+            }
+            map[attrs[i].name] = attrs[i].value;
+        }
+        return map
+    }
+
+    // for script (e.g. type="x/template") or style, do not decode content
+    function isTextTag (el) {
+        return el.tag === 'script' || el.tag === 'style'
+    }
+
+    function isForbiddenTag (el) {
+        return (
+            el.tag === 'style' ||
+            (el.tag === 'script' && (
+                !el.attrsMap.type ||
+                el.attrsMap.type === 'text/javascript'
+            ))
+        )
+    }
+
+    var ieNSBug = /^xmlns:NS\d+/;
+    var ieNSPrefix = /^NS\d+:/;
+
+    /* istanbul ignore next */
+    function guardIESVGBug (attrs) {
+        var res = [];
+        for (var i = 0; i < attrs.length; i++) {
+            var attr = attrs[i];
+            if (!ieNSBug.test(attr.name)) {
+                attr.name = attr.name.replace(ieNSPrefix, '');
+                res.push(attr);
+            }
+        }
+        return res
+    }
+
+    function checkForAliasModel (el, value) {
+        var _el = el;
+        while (_el) {
+            if (_el.for && _el.alias === value) {
+                warn$2(
+                    "<" + (el.tag) + " v-model=\"" + value + "\">: " +
+                    "You are binding v-model directly to a v-for iteration alias. " +
+                    "This will not be able to modify the v-for source array because " +
+                    "writing to the alias is like modifying a function local variable. " +
+                    "Consider using an array of objects and use v-model on an object property instead.",
+                    el.rawAttrsMap['v-model']
+                );
+            }
+            _el = _el.parent;
+        }
+    }
+
+    /*  */
+
+    function preTransformNode (el, options) {
+        if (el.tag === 'input') {
+            var map = el.attrsMap;
+            if (!map['v-model']) {
+                return
+            }
+
+            var typeBinding;
+            if (map[':type'] || map['v-bind:type']) {
+                typeBinding = getBindingAttr(el, 'type');
+            }
+            if (!map.type && !typeBinding && map['v-bind']) {
+                typeBinding = "(" + (map['v-bind']) + ").type";
+            }
+
+            if (typeBinding) {
+                var ifCondition = getAndRemoveAttr(el, 'v-if', true);
+                var ifConditionExtra = ifCondition ? ("&&(" + ifCondition + ")") : "";
+                var hasElse = getAndRemoveAttr(el, 'v-else', true) != null;
+                var elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);
+                // 1. checkbox
+                var branch0 = cloneASTElement(el);
+                // process for on the main node
+                processFor(branch0);
+                addRawAttr(branch0, 'type', 'checkbox');
+                processElement(branch0, options);
+                branch0.processed = true; // prevent it from double-processed
+                branch0.if = "(" + typeBinding + ")==='checkbox'" + ifConditionExtra;
+                addIfCondition(branch0, {
+                    exp: branch0.if,
+                    block: branch0
+                });
+                // 2. add radio else-if condition
+                var branch1 = cloneASTElement(el);
+                getAndRemoveAttr(branch1, 'v-for', true);
+                addRawAttr(branch1, 'type', 'radio');
+                processElement(branch1, options);
+                addIfCondition(branch0, {
+                    exp: "(" + typeBinding + ")==='radio'" + ifConditionExtra,
+                    block: branch1
+                });
+                // 3. other
+                var branch2 = cloneASTElement(el);
+                getAndRemoveAttr(branch2, 'v-for', true);
+                addRawAttr(branch2, ':type', typeBinding);
+                processElement(branch2, options);
+                addIfCondition(branch0, {
+                    exp: ifCondition,
+                    block: branch2
+                });
+
+                if (hasElse) {
+                    branch0.else = true;
+                } else if (elseIfCondition) {
+                    branch0.elseif = elseIfCondition;
+                }
+
+                return branch0
+            }
+        }
+    }
+
+    function cloneASTElement (el) {
+        return createASTElement(el.tag, el.attrsList.slice(), el.parent)
+    }
+
+    var model$1 = {
+        preTransformNode: preTransformNode
+    };
+
+    var modules$1 = [
+        klass$1,
+        style$1,
+        model$1
+    ];
+
+    /*  */
+
+    function text (el, dir) {
+        if (dir.value) {
+            addProp(el, 'textContent', ("_s(" + (dir.value) + ")"), dir);
+        }
+    }
+
+    /*  */
+
+    function html (el, dir) {
+        if (dir.value) {
+            addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"), dir);
+        }
+    }
+
+    var directives$1 = {
+        model: model,
+        text: text,
+        html: html
+    };
+
+    /*  */
+
+    var baseOptions = {
+        expectHTML: true,
+        modules: modules$1,
+        directives: directives$1,
+        isPreTag: isPreTag,
+        isUnaryTag: isUnaryTag,
+        mustUseProp: mustUseProp,
+        canBeLeftOpenTag: canBeLeftOpenTag,
+        isReservedTag: isReservedTag,
+        getTagNamespace: getTagNamespace,
+        staticKeys: genStaticKeys(modules$1)
+    };
+
+    /*  */
+
+    var isStaticKey;
+    var isPlatformReservedTag;
+
+    var genStaticKeysCached = cached(genStaticKeys$1);
+
+    /**
+     * Goal of the optimizer: walk the generated template AST tree
+     * and detect sub-trees that are purely static, i.e. parts of
+     * the DOM that never needs to change.
+     *
+     * Once we detect these sub-trees, we can:
+     *
+     * 1. Hoist them into constants, so that we no longer need to
+     *    create fresh nodes for them on each re-render;
+     * 2. Completely skip them in the patching process.
+     */
+    function optimize (root, options) {
+        if (!root) { return }
+        isStaticKey = genStaticKeysCached(options.staticKeys || '');
+        isPlatformReservedTag = options.isReservedTag || no;
+        // first pass: mark all non-static nodes.
+        markStatic$1(root);
+        // second pass: mark static roots.
+        markStaticRoots(root, false);
+    }
+
+    function genStaticKeys$1 (keys) {
+        return makeMap(
+            'type,tag,attrsList,attrsMap,plain,parent,children,attrs,start,end,rawAttrsMap' +
+            (keys ? ',' + keys : '')
+        )
+    }
+
+    function markStatic$1 (node) {
+        node.static = isStatic(node);
+        if (node.type === 1) {
+            // do not make component slot content static. this avoids
+            // 1. components not able to mutate slot nodes
+            // 2. static slot content fails for hot-reloading
+            if (
+                !isPlatformReservedTag(node.tag) &&
+                node.tag !== 'slot' &&
+                node.attrsMap['inline-template'] == null
+            ) {
+                return
+            }
+            for (var i = 0, l = node.children.length; i < l; i++) {
+                var child = node.children[i];
+                markStatic$1(child);
+                if (!child.static) {
+                    node.static = false;
+                }
+            }
+            if (node.ifConditions) {
+                for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
+                    var block = node.ifConditions[i$1].block;
+                    markStatic$1(block);
+                    if (!block.static) {
+                        node.static = false;
+                    }
+                }
+            }
+        }
+    }
+
+    function markStaticRoots (node, isInFor) {
+        if (node.type === 1) {
+            if (node.static || node.once) {
+                node.staticInFor = isInFor;
+            }
+            // For a node to qualify as a static root, it should have children that
+            // are not just static text. Otherwise the cost of hoisting out will
+            // outweigh the benefits and it's better off to just always render it fresh.
+            if (node.static && node.children.length && !(
+                node.children.length === 1 &&
+                node.children[0].type === 3
+            )) {
+                node.staticRoot = true;
+                return
+            } else {
+                node.staticRoot = false;
+            }
+            if (node.children) {
+                for (var i = 0, l = node.children.length; i < l; i++) {
+                    markStaticRoots(node.children[i], isInFor || !!node.for);
+                }
+            }
+            if (node.ifConditions) {
+                for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
+                    markStaticRoots(node.ifConditions[i$1].block, isInFor);
+                }
+            }
+        }
+    }
+
+    function isStatic (node) {
+        if (node.type === 2) { // expression
+            return false
+        }
+        if (node.type === 3) { // text
+            return true
+        }
+        return !!(node.pre || (
+            !node.hasBindings && // no dynamic bindings
+            !node.if && !node.for && // not v-if or v-for or v-else
+            !isBuiltInTag(node.tag) && // not a built-in
+            isPlatformReservedTag(node.tag) && // not a component
+            !isDirectChildOfTemplateFor(node) &&
+            Object.keys(node).every(isStaticKey)
+        ))
+    }
+
+    function isDirectChildOfTemplateFor (node) {
+        while (node.parent) {
+            node = node.parent;
+            if (node.tag !== 'template') {
+                return false
+            }
+            if (node.for) {
+                return true
+            }
+        }
+        return false
+    }
+
+    /*  */
+
+    var fnExpRE = /^([\w$_]+|\([^)]*?\))\s*=>|^function(?:\s+[\w$]+)?\s*\(/;
+    var fnInvokeRE = /\([^)]*?\);*$/;
+    var simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*$/;
+
+    // KeyboardEvent.keyCode aliases
+    var keyCodes = {
+        esc: 27,
+        tab: 9,
+        enter: 13,
+        space: 32,
+        up: 38,
+        left: 37,
+        right: 39,
+        down: 40,
+        'delete': [8, 46]
+    };
+
+    // KeyboardEvent.key aliases
+    var keyNames = {
+        // #7880: IE11 and Edge use `Esc` for Escape key name.
+        esc: ['Esc', 'Escape'],
+        tab: 'Tab',
+        enter: 'Enter',
+        // #9112: IE11 uses `Spacebar` for Space key name.
+        space: [' ', 'Spacebar'],
+        // #7806: IE11 uses key names without `Arrow` prefix for arrow keys.
+        up: ['Up', 'ArrowUp'],
+        left: ['Left', 'ArrowLeft'],
+        right: ['Right', 'ArrowRight'],
+        down: ['Down', 'ArrowDown'],
+        // #9112: IE11 uses `Del` for Delete key name.
+        'delete': ['Backspace', 'Delete', 'Del']
+    };
+
+    // #4868: modifiers that prevent the execution of the listener
+    // need to explicitly return null so that we can determine whether to remove
+    // the listener for .once
+    var genGuard = function (condition) { return ("if(" + condition + ")return null;"); };
+
+    var modifierCode = {
+        stop: '$event.stopPropagation();',
+        prevent: '$event.preventDefault();',
+        self: genGuard("$event.target !== $event.currentTarget"),
+        ctrl: genGuard("!$event.ctrlKey"),
+        shift: genGuard("!$event.shiftKey"),
+        alt: genGuard("!$event.altKey"),
+        meta: genGuard("!$event.metaKey"),
+        left: genGuard("'button' in $event && $event.button !== 0"),
+        middle: genGuard("'button' in $event && $event.button !== 1"),
+        right: genGuard("'button' in $event && $event.button !== 2")
+    };
+
+    function genHandlers (
+        events,
+        isNative
+    ) {
+        var prefix = isNative ? 'nativeOn:' : 'on:';
+        var staticHandlers = "";
+        var dynamicHandlers = "";
+        for (var name in events) {
+            var handlerCode = genHandler(events[name]);
+            if (events[name] && events[name].dynamic) {
+                dynamicHandlers += name + "," + handlerCode + ",";
+            } else {
+                staticHandlers += "\"" + name + "\":" + handlerCode + ",";
+            }
+        }
+        staticHandlers = "{" + (staticHandlers.slice(0, -1)) + "}";
+        if (dynamicHandlers) {
+            return prefix + "_d(" + staticHandlers + ",[" + (dynamicHandlers.slice(0, -1)) + "])"
+        } else {
+            return prefix + staticHandlers
+        }
+    }
+
+    function genHandler (handler) {
+        if (!handler) {
+            return 'function(){}'
+        }
+
+        if (Array.isArray(handler)) {
+            return ("[" + (handler.map(function (handler) { return genHandler(handler); }).join(',')) + "]")
+        }
+
+        var isMethodPath = simplePathRE.test(handler.value);
+        var isFunctionExpression = fnExpRE.test(handler.value);
+        var isFunctionInvocation = simplePathRE.test(handler.value.replace(fnInvokeRE, ''));
+
+        if (!handler.modifiers) {
+            if (isMethodPath || isFunctionExpression) {
+                return handler.value
+            }
+            return ("function($event){" + (isFunctionInvocation ? ("return " + (handler.value)) : handler.value) + "}") // inline statement
+        } else {
+            var code = '';
+            var genModifierCode = '';
+            var keys = [];
+            for (var key in handler.modifiers) {
+                if (modifierCode[key]) {
+                    genModifierCode += modifierCode[key];
+                    // left/right
+                    if (keyCodes[key]) {
+                        keys.push(key);
+                    }
+                } else if (key === 'exact') {
+                    var modifiers = (handler.modifiers);
+                    genModifierCode += genGuard(
+                        ['ctrl', 'shift', 'alt', 'meta']
+                            .filter(function (keyModifier) { return !modifiers[keyModifier]; })
+                            .map(function (keyModifier) { return ("$event." + keyModifier + "Key"); })
+                            .join('||')
+                    );
+                } else {
+                    keys.push(key);
+                }
+            }
+            if (keys.length) {
+                code += genKeyFilter(keys);
+            }
+            // Make sure modifiers like prevent and stop get executed after key filtering
+            if (genModifierCode) {
+                code += genModifierCode;
+            }
+            var handlerCode = isMethodPath
+                ? ("return " + (handler.value) + ".apply(null, arguments)")
+                : isFunctionExpression
+                    ? ("return (" + (handler.value) + ").apply(null, arguments)")
+                    : isFunctionInvocation
+                        ? ("return " + (handler.value))
+                        : handler.value;
+            return ("function($event){" + code + handlerCode + "}")
+        }
+    }
+
+    function genKeyFilter (keys) {
+        return (
+            // make sure the key filters only apply to KeyboardEvents
+            // #9441: can't use 'keyCode' in $event because Chrome autofill fires fake
+            // key events that do not have keyCode property...
+            "if(!$event.type.indexOf('key')&&" +
+            (keys.map(genFilterCode).join('&&')) + ")return null;"
+        )
+    }
+
+    function genFilterCode (key) {
+        var keyVal = parseInt(key, 10);
+        if (keyVal) {
+            return ("$event.keyCode!==" + keyVal)
+        }
+        var keyCode = keyCodes[key];
+        var keyName = keyNames[key];
+        return (
+            "_k($event.keyCode," +
+            (JSON.stringify(key)) + "," +
+            (JSON.stringify(keyCode)) + "," +
+            "$event.key," +
+            "" + (JSON.stringify(keyName)) +
+            ")"
+        )
+    }
+
+    /*  */
+
+    function on (el, dir) {
+        if (dir.modifiers) {
+            warn("v-on without argument does not support modifiers.");
+        }
+        el.wrapListeners = function (code) { return ("_g(" + code + "," + (dir.value) + ")"); };
+    }
+
+    /*  */
+
+    function bind$1 (el, dir) {
+        el.wrapData = function (code) {
+            return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
+        };
+    }
+
+    /*  */
+
+    var baseDirectives = {
+        on: on,
+        bind: bind$1,
+        cloak: noop
+    };
+
+    /*  */
+
+
+
+
+
+    var CodegenState = function CodegenState (options) {
+        this.options = options;
+        this.warn = options.warn || baseWarn;
+        this.transforms = pluckModuleFunction(options.modules, 'transformCode');
+        this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
+        this.directives = extend(extend({}, baseDirectives), options.directives);
+        var isReservedTag = options.isReservedTag || no;
+        this.maybeComponent = function (el) { return !!el.component || !isReservedTag(el.tag); };
+        this.onceId = 0;
+        this.staticRenderFns = [];
+        this.pre = false;
+    };
+
+
+
+    function generate (
+        ast,
+        options
+    ) {
+        var state = new CodegenState(options);
+        // fix #11483, Root level <script> tags should not be rendered.
+        var code = ast ? (ast.tag === 'script' ? 'null' : genElement(ast, state)) : '_c("div")';
+        return {
+            render: ("with(this){return " + code + "}"),
+            staticRenderFns: state.staticRenderFns
+        }
+    }
+
+    function genElement (el, state) {
+        if (el.parent) {
+            el.pre = el.pre || el.parent.pre;
+        }
+
+        if (el.staticRoot && !el.staticProcessed) {
+            return genStatic(el, state)
+        } else if (el.once && !el.onceProcessed) {
+            return genOnce(el, state)
+        } else if (el.for && !el.forProcessed) {
+            return genFor(el, state)
+        } else if (el.if && !el.ifProcessed) {
+            return genIf(el, state)
+        } else if (el.tag === 'template' && !el.slotTarget && !state.pre) {
+            return genChildren(el, state) || 'void 0'
+        } else if (el.tag === 'slot') {
+            return genSlot(el, state)
+        } else {
+            // component or element
+            var code;
+            if (el.component) {
+                code = genComponent(el.component, el, state);
+            } else {
+                var data;
+                if (!el.plain || (el.pre && state.maybeComponent(el))) {
+                    data = genData$2(el, state);
+                }
+
+                var children = el.inlineTemplate ? null : genChildren(el, state, true);
+                code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
+            }
+            // module transforms
+            for (var i = 0; i < state.transforms.length; i++) {
+                code = state.transforms[i](el, code);
+            }
+            return code
+        }
+    }
+
+    // hoist static sub-trees out
+    function genStatic (el, state) {
+        el.staticProcessed = true;
+        // Some elements (templates) need to behave differently inside of a v-pre
+        // node.  All pre nodes are static roots, so we can use this as a location to
+        // wrap a state change and reset it upon exiting the pre node.
+        var originalPreState = state.pre;
+        if (el.pre) {
+            state.pre = el.pre;
+        }
+        state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
+        state.pre = originalPreState;
+        return ("_m(" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
+    }
+
+    // v-once
+    function genOnce (el, state) {
+        el.onceProcessed = true;
+        if (el.if && !el.ifProcessed) {
+            return genIf(el, state)
+        } else if (el.staticInFor) {
+            var key = '';
+            var parent = el.parent;
+            while (parent) {
+                if (parent.for) {
+                    key = parent.key;
+                    break
+                }
+                parent = parent.parent;
+            }
+            if (!key) {
+                state.warn(
+                    "v-once can only be used inside v-for that is keyed. ",
+                    el.rawAttrsMap['v-once']
+                );
+                return genElement(el, state)
+            }
+            return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + "," + key + ")")
+        } else {
+            return genStatic(el, state)
+        }
+    }
+
+    function genIf (
+        el,
+        state,
+        altGen,
+        altEmpty
+    ) {
+        el.ifProcessed = true; // avoid recursion
+        return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
+    }
+
+    function genIfConditions (
+        conditions,
+        state,
+        altGen,
+        altEmpty
+    ) {
+        if (!conditions.length) {
+            return altEmpty || '_e()'
+        }
+
+        var condition = conditions.shift();
+        if (condition.exp) {
+            return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions, state, altGen, altEmpty)))
+        } else {
+            return ("" + (genTernaryExp(condition.block)))
+        }
+
+        // v-if with v-once should generate code like (a)?_m(0):_m(1)
+        function genTernaryExp (el) {
+            return altGen
+                ? altGen(el, state)
+                : el.once
+                    ? genOnce(el, state)
+                    : genElement(el, state)
+        }
+    }
+
+    function genFor (
+        el,
+        state,
+        altGen,
+        altHelper
+    ) {
+        var exp = el.for;
+        var alias = el.alias;
+        var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
+        var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
+
+        if (state.maybeComponent(el) &&
+            el.tag !== 'slot' &&
+            el.tag !== 'template' &&
+            !el.key
+        ) {
+            state.warn(
+                "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
+                "v-for should have explicit keys. " +
+                "See https://vuejs.org/guide/list.html#key for more info.",
+                el.rawAttrsMap['v-for'],
+                true /* tip */
+            );
+        }
+
+        el.forProcessed = true; // avoid recursion
+        return (altHelper || '_l') + "((" + exp + ")," +
+            "function(" + alias + iterator1 + iterator2 + "){" +
+            "return " + ((altGen || genElement)(el, state)) +
+            '})'
+    }
+
+    function genData$2 (el, state) {
+        var data = '{';
+
+        // directives first.
+        // directives may mutate the el's other properties before they are generated.
+        var dirs = genDirectives(el, state);
+        if (dirs) { data += dirs + ','; }
+
+        // key
+        if (el.key) {
+            data += "key:" + (el.key) + ",";
+        }
+        // ref
+        if (el.ref) {
+            data += "ref:" + (el.ref) + ",";
+        }
+        if (el.refInFor) {
+            data += "refInFor:true,";
+        }
+        // pre
+        if (el.pre) {
+            data += "pre:true,";
+        }
+        // record original tag name for components using "is" attribute
+        if (el.component) {
+            data += "tag:\"" + (el.tag) + "\",";
+        }
+        // module data generation functions
+        for (var i = 0; i < state.dataGenFns.length; i++) {
+            data += state.dataGenFns[i](el);
+        }
+        // attributes
+        if (el.attrs) {
+            data += "attrs:" + (genProps(el.attrs)) + ",";
+        }
+        // DOM props
+        if (el.props) {
+            data += "domProps:" + (genProps(el.props)) + ",";
+        }
+        // event handlers
+        if (el.events) {
+            data += (genHandlers(el.events, false)) + ",";
+        }
+        if (el.nativeEvents) {
+            data += (genHandlers(el.nativeEvents, true)) + ",";
+        }
+        // slot target
+        // only for non-scoped slots
+        if (el.slotTarget && !el.slotScope) {
+            data += "slot:" + (el.slotTarget) + ",";
+        }
+        // scoped slots
+        if (el.scopedSlots) {
+            data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
+        }
+        // component v-model
+        if (el.model) {
+            data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
+        }
+        // inline-template
+        if (el.inlineTemplate) {
+            var inlineTemplate = genInlineTemplate(el, state);
+            if (inlineTemplate) {
+                data += inlineTemplate + ",";
+            }
+        }
+        data = data.replace(/,$/, '') + '}';
+        // v-bind dynamic argument wrap
+        // v-bind with dynamic arguments must be applied using the same v-bind object
+        // merge helper so that class/style/mustUseProp attrs are handled correctly.
+        if (el.dynamicAttrs) {
+            data = "_b(" + data + ",\"" + (el.tag) + "\"," + (genProps(el.dynamicAttrs)) + ")";
+        }
+        // v-bind data wrap
+        if (el.wrapData) {
+            data = el.wrapData(data);
+        }
+        // v-on data wrap
+        if (el.wrapListeners) {
+            data = el.wrapListeners(data);
+        }
+        return data
+    }
+
+    function genDirectives (el, state) {
+        var dirs = el.directives;
+        if (!dirs) { return }
+        var res = 'directives:[';
+        var hasRuntime = false;
+        var i, l, dir, needRuntime;
+        for (i = 0, l = dirs.length; i < l; i++) {
+            dir = dirs[i];
+            needRuntime = true;
+            var gen = state.directives[dir.name];
+            if (gen) {
+                // compile-time directive that manipulates AST.
+                // returns true if it also needs a runtime counterpart.
+                needRuntime = !!gen(el, dir, state.warn);
+            }
+            if (needRuntime) {
+                hasRuntime = true;
+                res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:" + (dir.isDynamicArg ? dir.arg : ("\"" + (dir.arg) + "\""))) : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
+            }
+        }
+        if (hasRuntime) {
+            return res.slice(0, -1) + ']'
+        }
+    }
+
+    function genInlineTemplate (el, state) {
+        var ast = el.children[0];
+        if (el.children.length !== 1 || ast.type !== 1) {
+            state.warn(
+                'Inline-template components must have exactly one child element.',
+                { start: el.start }
+            );
+        }
+        if (ast && ast.type === 1) {
+            var inlineRenderFns = generate(ast, state.options);
+            return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
+        }
+    }
+
+    function genScopedSlots (
+        el,
+        slots,
+        state
+    ) {
+        // by default scoped slots are considered "stable", this allows child
+        // components with only scoped slots to skip forced updates from parent.
+        // but in some cases we have to bail-out of this optimization
+        // for example if the slot contains dynamic names, has v-if or v-for on them...
+        var needsForceUpdate = el.for || Object.keys(slots).some(function (key) {
+            var slot = slots[key];
+            return (
+                slot.slotTargetDynamic ||
+                slot.if ||
+                slot.for ||
+                containsSlotChild(slot) // is passing down slot from parent which may be dynamic
+            )
+        });
+
+        // #9534: if a component with scoped slots is inside a conditional branch,
+        // it's possible for the same component to be reused but with different
+        // compiled slot content. To avoid that, we generate a unique key based on
+        // the generated code of all the slot contents.
+        var needsKey = !!el.if;
+
+        // OR when it is inside another scoped slot or v-for (the reactivity may be
+        // disconnected due to the intermediate scope variable)
+        // #9438, #9506
+        // TODO: this can be further optimized by properly analyzing in-scope bindings
+        // and skip force updating ones that do not actually use scope variables.
+        if (!needsForceUpdate) {
+            var parent = el.parent;
+            while (parent) {
+                if (
+                    (parent.slotScope && parent.slotScope !== emptySlotScopeToken) ||
+                    parent.for
+                ) {
+                    needsForceUpdate = true;
+                    break
+                }
+                if (parent.if) {
+                    needsKey = true;
+                }
+                parent = parent.parent;
+            }
+        }
+
+        var generatedSlots = Object.keys(slots)
+            .map(function (key) { return genScopedSlot(slots[key], state); })
+            .join(',');
+
+        return ("scopedSlots:_u([" + generatedSlots + "]" + (needsForceUpdate ? ",null,true" : "") + (!needsForceUpdate && needsKey ? (",null,false," + (hash(generatedSlots))) : "") + ")")
+    }
+
+    function hash(str) {
+        var hash = 5381;
+        var i = str.length;
+        while(i) {
+            hash = (hash * 33) ^ str.charCodeAt(--i);
+        }
+        return hash >>> 0
+    }
+
+    function containsSlotChild (el) {
+        if (el.type === 1) {
+            if (el.tag === 'slot') {
+                return true
+            }
+            return el.children.some(containsSlotChild)
+        }
+        return false
+    }
+
+    function genScopedSlot (
+        el,
+        state
+    ) {
+        var isLegacySyntax = el.attrsMap['slot-scope'];
+        if (el.if && !el.ifProcessed && !isLegacySyntax) {
+            return genIf(el, state, genScopedSlot, "null")
+        }
+        if (el.for && !el.forProcessed) {
+            return genFor(el, state, genScopedSlot)
+        }
+        var slotScope = el.slotScope === emptySlotScopeToken
+            ? ""
+            : String(el.slotScope);
+        var fn = "function(" + slotScope + "){" +
+            "return " + (el.tag === 'template'
+                ? el.if && isLegacySyntax
+                    ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
+                    : genChildren(el, state) || 'undefined'
+                : genElement(el, state)) + "}";
+        // reverse proxy v-slot without scope on this.$slots
+        var reverseProxy = slotScope ? "" : ",proxy:true";
+        return ("{key:" + (el.slotTarget || "\"default\"") + ",fn:" + fn + reverseProxy + "}")
+    }
+
+    function genChildren (
+        el,
+        state,
+        checkSkip,
+        altGenElement,
+        altGenNode
+    ) {
+        var children = el.children;
+        if (children.length) {
+            var el$1 = children[0];
+            // optimize single v-for
+            if (children.length === 1 &&
+                el$1.for &&
+                el$1.tag !== 'template' &&
+                el$1.tag !== 'slot'
+            ) {
+                var normalizationType = checkSkip
+                    ? state.maybeComponent(el$1) ? ",1" : ",0"
+                    : "";
+                return ("" + ((altGenElement || genElement)(el$1, state)) + normalizationType)
+            }
+            var normalizationType$1 = checkSkip
+                ? getNormalizationType(children, state.maybeComponent)
+                : 0;
+            var gen = altGenNode || genNode;
+            return ("[" + (children.map(function (c) { return gen(c, state); }).join(',')) + "]" + (normalizationType$1 ? ("," + normalizationType$1) : ''))
+        }
+    }
+
+    // determine the normalization needed for the children array.
+    // 0: no normalization needed
+    // 1: simple normalization needed (possible 1-level deep nested array)
+    // 2: full normalization needed
+    function getNormalizationType (
+        children,
+        maybeComponent
+    ) {
+        var res = 0;
+        for (var i = 0; i < children.length; i++) {
+            var el = children[i];
+            if (el.type !== 1) {
+                continue
+            }
+            if (needsNormalization(el) ||
+                (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {
+                res = 2;
+                break
+            }
+            if (maybeComponent(el) ||
+                (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {
+                res = 1;
+            }
+        }
+        return res
+    }
+
+    function needsNormalization (el) {
+        return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
+    }
+
+    function genNode (node, state) {
+        if (node.type === 1) {
+            return genElement(node, state)
+        } else if (node.type === 3 && node.isComment) {
+            return genComment(node)
+        } else {
+            return genText(node)
+        }
+    }
+
+    function genText (text) {
+        return ("_v(" + (text.type === 2
+            ? text.expression // no need for () because already wrapped in _s()
+            : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
+    }
+
+    function genComment (comment) {
+        return ("_e(" + (JSON.stringify(comment.text)) + ")")
+    }
+
+    function genSlot (el, state) {
+        var slotName = el.slotName || '"default"';
+        var children = genChildren(el, state);
+        var res = "_t(" + slotName + (children ? (",function(){return " + children + "}") : '');
+        var attrs = el.attrs || el.dynamicAttrs
+            ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
+                // slot props are camelized
+                name: camelize(attr.name),
+                value: attr.value,
+                dynamic: attr.dynamic
+            }); }))
+            : null;
+        var bind$$1 = el.attrsMap['v-bind'];
+        if ((attrs || bind$$1) && !children) {
+            res += ",null";
+        }
+        if (attrs) {
+            res += "," + attrs;
+        }
+        if (bind$$1) {
+            res += (attrs ? '' : ',null') + "," + bind$$1;
+        }
+        return res + ')'
+    }
+
+    // componentName is el.component, take it as argument to shun flow's pessimistic refinement
+    function genComponent (
+        componentName,
+        el,
+        state
+    ) {
+        var children = el.inlineTemplate ? null : genChildren(el, state, true);
+        return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
+    }
+
+    function genProps (props) {
+        var staticProps = "";
+        var dynamicProps = "";
+        for (var i = 0; i < props.length; i++) {
+            var prop = props[i];
+            var value = transformSpecialNewlines(prop.value);
+            if (prop.dynamic) {
+                dynamicProps += (prop.name) + "," + value + ",";
+            } else {
+                staticProps += "\"" + (prop.name) + "\":" + value + ",";
+            }
+        }
+        staticProps = "{" + (staticProps.slice(0, -1)) + "}";
+        if (dynamicProps) {
+            return ("_d(" + staticProps + ",[" + (dynamicProps.slice(0, -1)) + "])")
+        } else {
+            return staticProps
+        }
+    }
+
+    // #3895, #4268
+    function transformSpecialNewlines (text) {
+        return text
+            .replace(/\u2028/g, '\\u2028')
+            .replace(/\u2029/g, '\\u2029')
+    }
+
+    /*  */
+
+
+
+    // these keywords should not appear inside expressions, but operators like
+    // typeof, instanceof and in are allowed
+    var prohibitedKeywordRE = new RegExp('\\b' + (
+        'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
+        'super,throw,while,yield,delete,export,import,return,switch,default,' +
+        'extends,finally,continue,debugger,function,arguments'
+    ).split(',').join('\\b|\\b') + '\\b');
+
+    // these unary operators should not be used as property/method names
+    var unaryOperatorsRE = new RegExp('\\b' + (
+        'delete,typeof,void'
+    ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');
+
+    // strip strings in expressions
+    var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;
+
+    // detect problematic expressions in a template
+    function detectErrors (ast, warn) {
+        if (ast) {
+            checkNode(ast, warn);
+        }
+    }
+
+    function checkNode (node, warn) {
+        if (node.type === 1) {
+            for (var name in node.attrsMap) {
+                if (dirRE.test(name)) {
+                    var value = node.attrsMap[name];
+                    if (value) {
+                        var range = node.rawAttrsMap[name];
+                        if (name === 'v-for') {
+                            checkFor(node, ("v-for=\"" + value + "\""), warn, range);
+                        } else if (name === 'v-slot' || name[0] === '#') {
+                            checkFunctionParameterExpression(value, (name + "=\"" + value + "\""), warn, range);
+                        } else if (onRE.test(name)) {
+                            checkEvent(value, (name + "=\"" + value + "\""), warn, range);
+                        } else {
+                            checkExpression(value, (name + "=\"" + value + "\""), warn, range);
+                        }
+                    }
+                }
+            }
+            if (node.children) {
+                for (var i = 0; i < node.children.length; i++) {
+                    checkNode(node.children[i], warn);
+                }
+            }
+        } else if (node.type === 2) {
+            checkExpression(node.expression, node.text, warn, node);
+        }
+    }
+
+    function checkEvent (exp, text, warn, range) {
+        var stripped = exp.replace(stripStringRE, '');
+        var keywordMatch = stripped.match(unaryOperatorsRE);
+        if (keywordMatch && stripped.charAt(keywordMatch.index - 1) !== '$') {
+            warn(
+                "avoid using JavaScript unary operator as property name: " +
+                "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim()),
+                range
+            );
+        }
+        checkExpression(exp, text, warn, range);
+    }
+
+    function checkFor (node, text, warn, range) {
+        checkExpression(node.for || '', text, warn, range);
+        checkIdentifier(node.alias, 'v-for alias', text, warn, range);
+        checkIdentifier(node.iterator1, 'v-for iterator', text, warn, range);
+        checkIdentifier(node.iterator2, 'v-for iterator', text, warn, range);
+    }
+
+    function checkIdentifier (
+        ident,
+        type,
+        text,
+        warn,
+        range
+    ) {
+        if (typeof ident === 'string') {
+            try {
+                new Function(("var " + ident + "=_"));
+            } catch (e) {
+                warn(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())), range);
+            }
+        }
+    }
+
+    function checkExpression (exp, text, warn, range) {
+        try {
+            new Function(("return " + exp));
+        } catch (e) {
+            var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
+            if (keywordMatch) {
+                warn(
+                    "avoid using JavaScript keyword as property name: " +
+                    "\"" + (keywordMatch[0]) + "\"\n  Raw expression: " + (text.trim()),
+                    range
+                );
+            } else {
+                warn(
+                    "invalid expression: " + (e.message) + " in\n\n" +
+                    "    " + exp + "\n\n" +
+                    "  Raw expression: " + (text.trim()) + "\n",
+                    range
+                );
+            }
+        }
+    }
+
+    function checkFunctionParameterExpression (exp, text, warn, range) {
+        try {
+            new Function(exp, '');
+        } catch (e) {
+            warn(
+                "invalid function parameter expression: " + (e.message) + " in\n\n" +
+                "    " + exp + "\n\n" +
+                "  Raw expression: " + (text.trim()) + "\n",
+                range
+            );
+        }
+    }
+
+    /*  */
+
+    var range = 2;
+
+    function generateCodeFrame (
+        source,
+        start,
+        end
+    ) {
+        if ( start === void 0 ) start = 0;
+        if ( end === void 0 ) end = source.length;
+
+        var lines = source.split(/\r?\n/);
+        var count = 0;
+        var res = [];
+        for (var i = 0; i < lines.length; i++) {
+            count += lines[i].length + 1;
+            if (count >= start) {
+                for (var j = i - range; j <= i + range || end > count; j++) {
+                    if (j < 0 || j >= lines.length) { continue }
+                    res.push(("" + (j + 1) + (repeat$1(" ", 3 - String(j + 1).length)) + "|  " + (lines[j])));
+                    var lineLength = lines[j].length;
+                    if (j === i) {
+                        // push underline
+                        var pad = start - (count - lineLength) + 1;
+                        var length = end > count ? lineLength - pad : end - start;
+                        res.push("   |  " + repeat$1(" ", pad) + repeat$1("^", length));
+                    } else if (j > i) {
+                        if (end > count) {
+                            var length$1 = Math.min(end - count, lineLength);
+                            res.push("   |  " + repeat$1("^", length$1));
+                        }
+                        count += lineLength + 1;
+                    }
+                }
+                break
+            }
+        }
+        return res.join('\n')
+    }
+
+    function repeat$1 (str, n) {
+        var result = '';
+        if (n > 0) {
+            while (true) { // eslint-disable-line
+                if (n & 1) { result += str; }
+                n >>>= 1;
+                if (n <= 0) { break }
+                str += str;
+            }
+        }
+        return result
+    }
+
+    /*  */
+
+
+
+    function createFunction (code, errors) {
+        try {
+            return new Function(code)
+        } catch (err) {
+            errors.push({ err: err, code: code });
+            return noop
+        }
+    }
+
+    function createCompileToFunctionFn (compile) {
+        var cache = Object.create(null);
+
+        return function compileToFunctions (
+            template,
+            options,
+            vm
+        ) {
+            options = extend({}, options);
+            var warn$$1 = options.warn || warn;
+            delete options.warn;
+
+            /* istanbul ignore if */
+            {
+                // detect possible CSP restriction
+                try {
+                    new Function('return 1');
+                } catch (e) {
+                    if (e.toString().match(/unsafe-eval|CSP/)) {
+                        warn$$1(
+                            'It seems you are using the standalone build of Vue.js in an ' +
+                            'environment with Content Security Policy that prohibits unsafe-eval. ' +
+                            'The template compiler cannot work in this environment. Consider ' +
+                            'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
+                            'templates into render functions.'
+                        );
+                    }
+                }
+            }
+
+            // check cache
+            var key = options.delimiters
+                ? String(options.delimiters) + template
+                : template;
+            if (cache[key]) {
+                return cache[key]
+            }
+
+            // compile
+            var compiled = compile(template, options);
+
+            // check compilation errors/tips
+            {
+                if (compiled.errors && compiled.errors.length) {
+                    if (options.outputSourceRange) {
+                        compiled.errors.forEach(function (e) {
+                            warn$$1(
+                                "Error compiling template:\n\n" + (e.msg) + "\n\n" +
+                                generateCodeFrame(template, e.start, e.end),
+                                vm
+                            );
+                        });
+                    } else {
+                        warn$$1(
+                            "Error compiling template:\n\n" + template + "\n\n" +
+                            compiled.errors.map(function (e) { return ("- " + e); }).join('\n') + '\n',
+                            vm
+                        );
+                    }
+                }
+                if (compiled.tips && compiled.tips.length) {
+                    if (options.outputSourceRange) {
+                        compiled.tips.forEach(function (e) { return tip(e.msg, vm); });
+                    } else {
+                        compiled.tips.forEach(function (msg) { return tip(msg, vm); });
+                    }
+                }
+            }
+
+            // turn code into functions
+            var res = {};
+            var fnGenErrors = [];
+            res.render = createFunction(compiled.render, fnGenErrors);
+            res.staticRenderFns = compiled.staticRenderFns.map(function (code) {
+                return createFunction(code, fnGenErrors)
+            });
+
+            // check function generation errors.
+            // this should only happen if there is a bug in the compiler itself.
+            // mostly for codegen development use
+            /* istanbul ignore if */
+            {
+                if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
+                    warn$$1(
+                        "Failed to generate render function:\n\n" +
+                        fnGenErrors.map(function (ref) {
+                            var err = ref.err;
+                            var code = ref.code;
+
+                            return ((err.toString()) + " in\n\n" + code + "\n");
+                        }).join('\n'),
+                        vm
+                    );
+                }
+            }
+
+            return (cache[key] = res)
+        }
+    }
+
+    /*  */
+
+    function createCompilerCreator (baseCompile) {
+        return function createCompiler (baseOptions) {
+            function compile (
+                template,
+                options
+            ) {
+                var finalOptions = Object.create(baseOptions);
+                var errors = [];
+                var tips = [];
+
+                var warn = function (msg, range, tip) {
+                    (tip ? tips : errors).push(msg);
+                };
+
+                if (options) {
+                    if (options.outputSourceRange) {
+                        // $flow-disable-line
+                        var leadingSpaceLength = template.match(/^\s*/)[0].length;
+
+                        warn = function (msg, range, tip) {
+                            var data = { msg: msg };
+                            if (range) {
+                                if (range.start != null) {
+                                    data.start = range.start + leadingSpaceLength;
+                                }
+                                if (range.end != null) {
+                                    data.end = range.end + leadingSpaceLength;
+                                }
+                            }
+                            (tip ? tips : errors).push(data);
+                        };
+                    }
+                    // merge custom modules
+                    if (options.modules) {
+                        finalOptions.modules =
+                            (baseOptions.modules || []).concat(options.modules);
+                    }
+                    // merge custom directives
+                    if (options.directives) {
+                        finalOptions.directives = extend(
+                            Object.create(baseOptions.directives || null),
+                            options.directives
+                        );
+                    }
+                    // copy other options
+                    for (var key in options) {
+                        if (key !== 'modules' && key !== 'directives') {
+                            finalOptions[key] = options[key];
+                        }
+                    }
+                }
+
+                finalOptions.warn = warn;
+
+                var compiled = baseCompile(template.trim(), finalOptions);
+                {
+                    detectErrors(compiled.ast, warn);
+                }
+                compiled.errors = errors;
+                compiled.tips = tips;
+                return compiled
+            }
+
+            return {
+                compile: compile,
+                compileToFunctions: createCompileToFunctionFn(compile)
+            }
+        }
+    }
+
+    /*  */
+
+    // `createCompilerCreator` allows creating compilers that use alternative
+    // parser/optimizer/codegen, e.g the SSR optimizing compiler.
+    // Here we just export a default compiler using the default parts.
+    var createCompiler = createCompilerCreator(function baseCompile (
+        template,
+        options
+    ) {
+        var ast = parse(template.trim(), options);
+        if (options.optimize !== false) {
+            optimize(ast, options);
+        }
+        var code = generate(ast, options);
+        return {
+            ast: ast,
+            render: code.render,
+            staticRenderFns: code.staticRenderFns
+        }
+    });
+
+    /*  */
+
+    var ref$1 = createCompiler(baseOptions);
+    var compile = ref$1.compile;
+    var compileToFunctions = ref$1.compileToFunctions;
+
+    /*  */
+
+    // check whether current browser encodes a char inside attribute values
+    var div;
+    function getShouldDecode (href) {
+        div = div || document.createElement('div');
+        div.innerHTML = href ? "<a href=\"\n\"/>" : "<div a=\"\n\"/>";
+        return div.innerHTML.indexOf('&#10;') > 0
+    }
+
+    // #3663: IE encodes newlines inside attribute values while other browsers don't
+    var shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;
+    // #6828: chrome encodes content in a[href]
+    var shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;
+
+    /*  */
+
+    var idToTemplate = cached(function (id) {
+        var el = query(id);
+        return el && el.innerHTML
+    });
+
+    var mount = Vue.prototype.$mount;
+    Vue.prototype.$mount = function (
+        el,
+        hydrating
+    ) {
+        el = el && query(el);
+
+        /* istanbul ignore if */
+        if (el === document.body || el === document.documentElement) {
+            warn(
+                "Do not mount Vue to <html> or <body> - mount to normal elements instead."
+            );
+            return this
+        }
+
+        var options = this.$options;
+        // resolve template/el and convert to render function
+        if (!options.render) {
+            var template = options.template;
+            if (template) {
+                if (typeof template === 'string') {
+                    if (template.charAt(0) === '#') {
+                        template = idToTemplate(template);
+                        /* istanbul ignore if */
+                        if (!template) {
+                            warn(
+                                ("Template element not found or is empty: " + (options.template)),
+                                this
+                            );
+                        }
+                    }
+                } else if (template.nodeType) {
+                    template = template.innerHTML;
+                } else {
+                    {
+                        warn('invalid template option:' + template, this);
+                    }
+                    return this
+                }
+            } else if (el) {
+                template = getOuterHTML(el);
+            }
+            if (template) {
+                /* istanbul ignore if */
+                if (config.performance && mark) {
+                    mark('compile');
+                }
+
+                var ref = compileToFunctions(template, {
+                    outputSourceRange: "development" !== 'production',
+                    shouldDecodeNewlines: shouldDecodeNewlines,
+                    shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,
+                    delimiters: options.delimiters,
+                    comments: options.comments
+                }, this);
+                var render = ref.render;
+                var staticRenderFns = ref.staticRenderFns;
+                options.render = render;
+                options.staticRenderFns = staticRenderFns;
+
+                /* istanbul ignore if */
+                if (config.performance && mark) {
+                    mark('compile end');
+                    measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
+                }
+            }
+        }
+        return mount.call(this, el, hydrating)
+    };
+
+    /**
+     * Get outerHTML of elements, taking care
+     * of SVG elements in IE as well.
+     */
+    function getOuterHTML (el) {
+        if (el.outerHTML) {
+            return el.outerHTML
+        } else {
+            var container = document.createElement('div');
+            container.appendChild(el.cloneNode(true));
+            return container.innerHTML
+        }
+    }
+
+    Vue.compile = compileToFunctions;
+
+    return Vue;
+
+}));