build.dev.js

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }

var he = _interopDefault(require('he'));

/*  */

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]'
}

/**
 * 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;

/**
 * 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 isAttr = makeMap(
  'accept,accept-charset,accesskey,action,align,alt,async,autocomplete,' +
  'autofocus,autoplay,autosave,bgcolor,border,buffered,challenge,charset,' +
  'checked,cite,class,code,codebase,color,cols,colspan,content,' +
  'contenteditable,contextmenu,controls,coords,data,datetime,default,' +
  'defer,dir,dirname,disabled,download,draggable,dropzone,enctype,for,' +
  'form,formaction,headers,height,hidden,high,href,hreflang,http-equiv,' +
  'icon,id,ismap,itemprop,keytype,kind,label,lang,language,list,loop,low,' +
  'manifest,max,maxlength,media,method,GET,POST,min,multiple,email,file,' +
  'muted,name,novalidate,open,optimum,pattern,ping,placeholder,poster,' +
  'preload,radiogroup,readonly,rel,required,reversed,rows,rowspan,sandbox,' +
  'scope,scoped,seamless,selected,shape,size,type,text,password,sizes,span,' +
  'spellcheck,src,srcdoc,srclang,srcset,start,step,style,summary,tabindex,' +
  'target,title,usemap,value,width,wrap'
);

var unsafeAttrCharRE = /[>/="'\u0009\u000a\u000c\u0020]/; // eslint-disable-line no-control-regex
var isSSRUnsafeAttr = function (name) {
  return unsafeAttrCharRE.test(name)
};

/* istanbul ignore next */
var isRenderableAttr = function (name) {
  return (
    isAttr(name) ||
    name.indexOf('data-') === 0 ||
    name.indexOf('aria-') === 0
  )
};

var propsToAttrMap = {
  acceptCharset: 'accept-charset',
  className: 'class',
  htmlFor: 'for',
  httpEquiv: 'http-equiv'
};

var ESC = {
  '<': '&lt;',
  '>': '&gt;',
  '"': '&quot;',
  '&': '&amp;'
};

function escape (s) {
  return s.replace(/[<>"&]/g, escapeChar)
}

function escapeChar (a) {
  return ESC[a] || a
}

var noUnitNumericStyleProps = {
  "animation-iteration-count": true,
  "border-image-outset": true,
  "border-image-slice": true,
  "border-image-width": true,
  "box-flex": true,
  "box-flex-group": true,
  "box-ordinal-group": true,
  "column-count": true,
  "columns": true,
  "flex": true,
  "flex-grow": true,
  "flex-positive": true,
  "flex-shrink": true,
  "flex-negative": true,
  "flex-order": true,
  "grid-row": true,
  "grid-row-end": true,
  "grid-row-span": true,
  "grid-row-start": true,
  "grid-column": true,
  "grid-column-end": true,
  "grid-column-span": true,
  "grid-column-start": true,
  "font-weight": true,
  "line-clamp": true,
  "line-height": true,
  "opacity": true,
  "order": true,
  "orphans": true,
  "tab-size": true,
  "widows": true,
  "z-index": true,
  "zoom": true,
  // SVG
  "fill-opacity": true,
  "flood-opacity": true,
  "stop-opacity": true,
  "stroke-dasharray": true,
  "stroke-dashoffset": true,
  "stroke-miterlimit": true,
  "stroke-opacity": true,
  "stroke-width": true
};

/*  */

// 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 isFalsyAttrValue = function (val) {
  return val == null || val === false
};

/*  */

function renderAttrs (node) {
  var attrs = node.data.attrs;
  var res = '';

  var opts = node.parent && node.parent.componentOptions;
  if (isUndef(opts) || opts.Ctor.options.inheritAttrs !== false) {
    var parent = node.parent;
    while (isDef(parent)) {
      // Stop fallthrough in case parent has inheritAttrs option set to false
      if (parent.componentOptions && parent.componentOptions.Ctor.options.inheritAttrs === false) {
        break;
      }
      if (isDef(parent.data) && isDef(parent.data.attrs)) {
        attrs = extend(extend({}, attrs), parent.data.attrs);
      }
      parent = parent.parent;
    }
  }

  if (isUndef(attrs)) {
    return res
  }

  for (var key in attrs) {
    if (isSSRUnsafeAttr(key)) {
      continue
    }
    if (key === 'style') {
      // leave it to the style module
      continue
    }
    res += renderAttr(key, attrs[key]);
  }
  return res
}

function renderAttr (key, value) {
  if (isBooleanAttr(key)) {
    if (!isFalsyAttrValue(value)) {
      return (" " + key + "=\"" + key + "\"")
    }
  } else if (isEnumeratedAttr(key)) {
    return (" " + key + "=\"" + (escape(convertEnumeratedValue(key, value))) + "\"")
  } else if (!isFalsyAttrValue(value)) {
    return (" " + key + "=\"" + (escape(String(value))) + "\"")
  }
  return ''
}

/*  */

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
}

/*  */

function renderDOMProps (node) {
  var props = node.data.domProps;
  var res = '';

  var parent = node.parent;
  while (isDef(parent)) {
    if (parent.data && parent.data.domProps) {
      props = extend(extend({}, props), parent.data.domProps);
    }
    parent = parent.parent;
  }

  if (isUndef(props)) {
    return res
  }

  var attrs = node.data.attrs;
  for (var key in props) {
    if (key === 'innerHTML') {
      setText(node, props[key], true);
    } else if (key === 'textContent') {
      setText(node, props[key], false);
    } else if (key === 'value' && node.tag === 'textarea') {
      setText(node, toString(props[key]), false);
    } else {
      // $flow-disable-line (WTF?)
      var attr = propsToAttrMap[key] || key.toLowerCase();
      if (isRenderableAttr(attr) &&
        // avoid rendering double-bound props/attrs twice
        !(isDef(attrs) && isDef(attrs[attr]))
      ) {
        res += renderAttr(attr, props[key]);
      }
    }
  }
  return res
}

function setText (node, text, raw) {
  var child = new VNode(undefined, undefined, undefined, text);
  child.raw = raw;
  node.children = [child];
}

/*  */

/**
 * 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/;

/**
 * Define a property.
 */
function def (obj, key, val, enumerable) {
  Object.defineProperty(obj, key, {
    value: val,
    enumerable: !!enumerable,
    writable: true,
    configurable: true
  });
}

/*  */

// 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;
if (inBrowser) {
  try {
    var opts = {};
    Object.defineProperty(opts, 'passive', ({
      get: function get () {
      }
    })); // 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 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
});

/*  */

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 (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();
  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];
}

/*
 * 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
}

/**
 * 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) {
  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 callbacks = [];

function flushCallbacks () {
  var copies = callbacks.slice(0);
  callbacks.length = 0;
  for (var i = 0; i < copies.length; i++) {
    copies[i]();
  }
}

// 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)) ; 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
  });
} else if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) ;

/*  */

/*  */

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 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 isTextInputType = makeMap('text,number,password,search,email,tel,url');

/*  */

/*  */

function renderClass$1 (node) {
  var classList = genClassForVnode(node);
  if (classList !== '') {
    return (" class=\"" + (escape(classList)) + "\"")
  }
}

/*  */

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
}

/*  */

function genStyle (style) {
  var styleText = '';
  for (var key in style) {
    var value = style[key];
    var hyphenatedKey = hyphenate(key);
    if (Array.isArray(value)) {
      for (var i = 0, len = value.length; i < len; i++) {
        styleText += normalizeValue(hyphenatedKey, value[i]);
      }
    } else {
      styleText += normalizeValue(hyphenatedKey, value);
    }
  }
  return styleText
}

function normalizeValue(key, value) {
  if (
    typeof value === 'string' ||
    (typeof value === 'number' && noUnitNumericStyleProps[key]) ||
    value === 0
  ) {
    return (key + ":" + value + ";")
  } else {
    // invalid values
    return ""
  }
}

function renderStyle (vnode) {
  var styleText = genStyle(getStyle(vnode, false));
  if (styleText !== '') {
    return (" style=" + (JSON.stringify(escape(styleText))))
  }
}

var modules = [
  renderAttrs,
  renderDOMProps,
  renderClass$1,
  renderStyle
];

/*  */

function show (node, dir) {
  if (!dir.value) {
    var style = node.data.style || (node.data.style = {});
    if (Array.isArray(style)) {
      style.push({ display: 'none' });
    } else {
      style.display = 'none';
    }
  }
}

/*  */

// this is only applied for <select v-model> because it is the only edge case
// that must be done at runtime instead of compile time.
function model (node, dir) {
  if (!node.children) { return }
  var value = dir.value;
  var isMultiple = node.data.attrs && node.data.attrs.multiple;
  for (var i = 0, l = node.children.length; i < l; i++) {
    var option = node.children[i];
    if (option.tag === 'option') {
      if (isMultiple) {
        var selected =
          Array.isArray(value) &&
          (looseIndexOf(value, getValue(option)) > -1);
        if (selected) {
          setSelected(option);
        }
      } else {
        if (looseEqual(value, getValue(option))) {
          setSelected(option);
          return
        }
      }
    }
  }
}

function getValue (option) {
  var data = option.data || {};
  return (
    (data.attrs && data.attrs.value) ||
    (data.domProps && data.domProps.value) ||
    (option.children && option.children[0] && option.children[0].text)
  )
}

function setSelected (option) {
  var data = option.data || (option.data = {});
  var attrs = data.attrs || (data.attrs = {});
  attrs.selected = '';
}

var baseDirectives = {
  show: show,
  model: model
};

/*  */

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'
);

/*  */

var MAX_STACK_DEPTH = 800;
var noop$1 = function (_) { return _; };

var defer = typeof process !== 'undefined' && process.nextTick
  ? process.nextTick
  : typeof Promise !== 'undefined'
    ? function (fn) { return Promise.resolve().then(fn); }
    : typeof setTimeout !== 'undefined'
      ? setTimeout
      : noop$1;

if (defer === noop$1) {
  throw new Error(
    'Your JavaScript runtime does not support any asynchronous primitives ' +
    'that are required by vue-server-renderer. Please use a polyfill for ' +
    'either Promise or setTimeout.'
  )
}

function createWriteFunction (
  write,
  onError
) {
  var stackDepth = 0;
  var cachedWrite = function (text, next) {
    if (text && cachedWrite.caching) {
      cachedWrite.cacheBuffer[cachedWrite.cacheBuffer.length - 1] += text;
    }
    var waitForNext = write(text, next);
    if (waitForNext !== true) {
      if (stackDepth >= MAX_STACK_DEPTH) {
        defer(function () {
          try { next(); } catch (e) {
            onError(e);
          }
        });
      } else {
        stackDepth++;
        next();
        stackDepth--;
      }
    }
  };
  cachedWrite.caching = false;
  cachedWrite.cacheBuffer = [];
  cachedWrite.componentBuffer = [];
  return cachedWrite
}

/*  */

/**
 * Original RenderStream implementation by Sasha Aickin (@aickin)
 * Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Modified by Evan You (@yyx990803)
 */

var stream = require('stream');

var RenderStream = /*@__PURE__*/(function (superclass) {
  function RenderStream (render) {
    var this$1 = this;

    superclass.call(this);
    this.buffer = '';
    this.render = render;
    this.expectedSize = 0;

    this.write = createWriteFunction(function (text, next) {
      var n = this$1.expectedSize;
      this$1.buffer += text;
      if (this$1.buffer.length >= n) {
        this$1.next = next;
        this$1.pushBySize(n);
        return true // we will decide when to call next
      }
      return false
    }, function (err) {
      this$1.emit('error', err);
    });

    this.end = function () {
      this$1.emit('beforeEnd');
      // the rendering is finished; we should push out the last of the buffer.
      this$1.done = true;
      this$1.push(this$1.buffer);
    };
  }

  if ( superclass ) RenderStream.__proto__ = superclass;
  RenderStream.prototype = Object.create( superclass && superclass.prototype );
  RenderStream.prototype.constructor = RenderStream;

  RenderStream.prototype.pushBySize = function pushBySize (n) {
    var bufferToPush = this.buffer.substring(0, n);
    this.buffer = this.buffer.substring(n);
    this.push(bufferToPush);
  };

  RenderStream.prototype.tryRender = function tryRender () {
    try {
      this.render(this.write, this.end);
    } catch (e) {
      this.emit('error', e);
    }
  };

  RenderStream.prototype.tryNext = function tryNext () {
    try {
      this.next();
    } catch (e) {
      this.emit('error', e);
    }
  };

  RenderStream.prototype._read = function _read (n) {
    this.expectedSize = n;
    // it's possible that the last chunk added bumped the buffer up to > 2 * n,
    // which means we will need to go through multiple read calls to drain it
    // down to < n.
    if (isTrue(this.done)) {
      this.push(null);
      return
    }
    if (this.buffer.length >= n) {
      this.pushBySize(n);
      return
    }
    if (isUndef(this.next)) {
      // start the rendering chain.
      this.tryRender();
    } else {
      // continue with the rendering.
      this.tryNext();
    }
  };

  return RenderStream;
}(stream.Readable));

/*  */



var RenderContext = function RenderContext (options) {
  this.userContext = options.userContext;
  this.activeInstance = options.activeInstance;
  this.renderStates = [];

  this.write = options.write;
  this.done = options.done;
  this.renderNode = options.renderNode;

  this.isUnaryTag = options.isUnaryTag;
  this.modules = options.modules;
  this.directives = options.directives;

  var cache = options.cache;
  if (cache && (!cache.get || !cache.set)) {
    throw new Error('renderer cache must implement at least get & set.')
  }
  this.cache = cache;
  this.get = cache && normalizeAsync(cache, 'get');
  this.has = cache && normalizeAsync(cache, 'has');

  this.next = this.next.bind(this);
};

RenderContext.prototype.next = function next () {
  // eslint-disable-next-line
  while (true) {
    var lastState = this.renderStates[this.renderStates.length - 1];
    if (isUndef(lastState)) {
      return this.done()
    }
    /* eslint-disable no-case-declarations */
    switch (lastState.type) {
      case 'Element':
      case 'Fragment':
        var children = lastState.children;
      var total = lastState.total;
        var rendered = lastState.rendered++;
        if (rendered < total) {
          return this.renderNode(children[rendered], false, this)
        } else {
          this.renderStates.pop();
          if (lastState.type === 'Element') {
            return this.write(lastState.endTag, this.next)
          }
        }
        break
      case 'Component':
        this.renderStates.pop();
        this.activeInstance = lastState.prevActive;
        break
      case 'ComponentWithCache':
        this.renderStates.pop();
        var buffer = lastState.buffer;
      var bufferIndex = lastState.bufferIndex;
      var componentBuffer = lastState.componentBuffer;
      var key = lastState.key;
        var result = {
          html: buffer[bufferIndex],
          components: componentBuffer[bufferIndex]
        };
        this.cache.set(key, result);
        if (bufferIndex === 0) {
          // this is a top-level cached component,
          // exit caching mode.
          this.write.caching = false;
        } else {
          // parent component is also being cached,
          // merge self into parent's result
          buffer[bufferIndex - 1] += result.html;
          var prev = componentBuffer[bufferIndex - 1];
          result.components.forEach(function (c) { return prev.add(c); });
        }
        buffer.length = bufferIndex;
        componentBuffer.length = bufferIndex;
        break
    }
  }
};

function normalizeAsync (cache, method) {
  var fn = cache[method];
  if (isUndef(fn)) {
    return
  } else if (fn.length > 1) {
    return function (key, cb) { return fn.call(cache, key, cb); }
  } else {
    return function (key, cb) { return cb(fn.call(cache, key)); }
  }
}

/*  */

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))
  }
}

/*  */

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
  }
}

/*  */



/* 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
}

/*  */

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 = {
  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 = {
  staticKeys: ['staticStyle'],
  transformNode: transformNode$1,
  genData: genData$1
};

/**
 * 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);
      }
    }
  }
}

/*  */

/**
 * 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, 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 = val.lastIndexOf('.');
    if (index > -1) {
      return {
        exp: val.slice(0, index),
        key: '"' + val.slice(index + 1) + '"'
      }
    } else {
      return {
        exp: val,
        key: null
      }
    }
  }

  str = val;
  index = 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)
}

function eof () {
  return index >= len
}

function isStringStart (chr) {
  return chr === 0x22 || chr === 0x27
}

function parseBracket (chr) {
  var inBracket = 1;
  expressionPos = index;
  while (!eof()) {
    chr = next();
    if (isStringStart(chr)) {
      parseString(chr);
      continue
    }
    if (chr === 0x5B) { inBracket++; }
    if (chr === 0x5D) { inBracket--; }
    if (inBracket === 0) {
      expressionEndPos = index;
      break
    }
  }
}

function parseString (chr) {
  var stringQuote = chr;
  while (!eof()) {
    chr = next();
    if (chr === stringQuote) {
      break
    }
  }
}

/*  */

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 = /[ \f\t\r\n]+/g;

var invalidAttributeRE = /[\s"'<>\/=]/;

var decodeHTMLCached = cached(he.decode);

var emptySlotScopeToken = "_empty_";

// configurable state
var warn$1;
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$1 = 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$1(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$1,
    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$1(
              "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$1(
          '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, ' ');
        }
        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$1(
          "<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$1(
            "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$1(
        ("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$1(
      "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$1(
          "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$1(
        "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$1(
        "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$1(
              "Unexpected mixed usage of different slot syntaxes.",
              el
            );
          }
          if (el.parent && !maybeComponent(el.parent)) {
            warn$1(
              "<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$1(
              "v-slot can only be used on components or <template>.",
              slotBinding$1
            );
          }
          if (el.slotScope || el.slotTarget) {
            warn$1(
              "Unexpected mixed usage of different slot syntaxes.",
              el
            );
          }
          if (el.scopedSlots) {
            warn$1(
              "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$1(
        "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$1(
        "`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$1(
            ("The value for a v-bind expression cannot be empty. Found in \"v-bind:" + name + "\"")
          );
        }
        if (modifiers) {
          if (modifiers.prop && !isDynamic) {
            name = camelize(name);
            if (name === 'innerHtml') { name = 'innerHTML'; }
          }
          if (modifiers.camel && !isDynamic) {
            name = camelize(name);
          }
          if (modifiers.sync) {
            syncGen = genAssignmentCode(value, "$event");
            if (!isDynamic) {
              addHandler(
                el,
                ("update:" + (camelize(name))),
                syncGen,
                null,
                false,
                warn$1,
                list[i]
              );
              if (hyphenate(name) !== camelize(name)) {
                addHandler(
                  el,
                  ("update:" + (hyphenate(name))),
                  syncGen,
                  null,
                  false,
                  warn$1,
                  list[i]
                );
              }
            } else {
              // handler w/ dynamic event name
              addHandler(
                el,
                ("\"update:\"+(" + name + ")"),
                syncGen,
                null,
                false,
                warn$1,
                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$1, 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$1(
            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$1('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$1(
        "<" + (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,
  style,
  model$1
];

/*  */

var warn$2;

// in some cases, the event used has to be determined at runtime
// so we used some reserved tokens during compile.
var RANGE_TOKEN = '__r';

function model$2 (
  el,
  dir,
  _warn
) {
  warn$2 = _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$2(
        "<" + (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 {
    genComponentModel(el, value, modifiers);
    // component v-model doesn't need extra runtime
    return false
  }

  // 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$2(
        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()');
  }
}

/*  */

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 = {
  model: model$2,
  text: text,
  html: html
};

/*  */

var baseOptions = {
  expectHTML: true,
  modules: modules$1,
  directives: directives,
  isPreTag: isPreTag,
  isUnaryTag: isUnaryTag,
  mustUseProp: mustUseProp,
  canBeLeftOpenTag: canBeLeftOpenTag,
  isReservedTag: isReservedTag,
  getTagNamespace: getTagNamespace,
  staticKeys: genStaticKeys(modules$1)
};

/*  */

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$1 = {
  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$1), 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')
}

/*  */




var plainStringRE = /^"(?:[^"\\]|\\.)*"$|^'(?:[^'\\]|\\.)*'$/;

// let the model AST transform translate v-model into appropriate
// props bindings
function applyModelTransform (el, state) {
  if (el.directives) {
    for (var i = 0; i < el.directives.length; i++) {
      var dir = el.directives[i];
      if (dir.name === 'model') {
        state.directives.model(el, dir, state.warn);
        // remove value for textarea as its converted to text
        if (el.tag === 'textarea' && el.props) {
          el.props = el.props.filter(function (p) { return p.name !== 'value'; });
        }
        break
      }
    }
  }
}

function genAttrSegments (
  attrs
) {
  return attrs.map(function (ref) {
    var name = ref.name;
    var value = ref.value;

    return genAttrSegment(name, value);
  })
}

function genDOMPropSegments (
  props,
  attrs
) {
  var segments = [];
  props.forEach(function (ref) {
    var name = ref.name;
    var value = ref.value;

    name = propsToAttrMap[name] || name.toLowerCase();
    if (isRenderableAttr(name) &&
      !(attrs && attrs.some(function (a) { return a.name === name; }))
    ) {
      segments.push(genAttrSegment(name, value));
    }
  });
  return segments
}

function genAttrSegment (name, value) {
  if (plainStringRE.test(value)) {
    // force double quote
    value = value.replace(/^'|'$/g, '"');
    // force enumerated attr to "true"
    if (isEnumeratedAttr(name) && value !== "\"false\"") {
      value = "\"true\"";
    }
    return {
      type: RAW,
      value: isBooleanAttr(name)
        ? (" " + name + "=\"" + name + "\"")
        : value === '""'
          ? (" " + name)
          : (" " + name + "=\"" + (JSON.parse(value)) + "\"")
    }
  } else {
    return {
      type: EXPRESSION,
      value: ("_ssrAttr(" + (JSON.stringify(name)) + "," + value + ")")
    }
  }
}

function genClassSegments (
  staticClass,
  classBinding
) {
  if (staticClass && !classBinding) {
    return [{ type: RAW, value: (" class=\"" + (JSON.parse(staticClass)) + "\"") }]
  } else {
    return [{
      type: EXPRESSION,
      value: ("_ssrClass(" + (staticClass || 'null') + "," + (classBinding || 'null') + ")")
    }]
  }
}

function genStyleSegments (
  staticStyle,
  parsedStaticStyle,
  styleBinding,
  vShowExpression
) {
  if (staticStyle && !styleBinding && !vShowExpression) {
    return [{ type: RAW, value: (" style=" + (JSON.stringify(staticStyle))) }]
  } else {
    return [{
      type: EXPRESSION,
      value: ("_ssrStyle(" + (parsedStaticStyle || 'null') + "," + (styleBinding || 'null') + ", " + (vShowExpression
          ? ("{ display: (" + vShowExpression + ") ? '' : 'none' }")
          : 'null') + ")")
    }]
  }
}

/*  */

// optimizability constants
var optimizability = {
  FALSE: 0,    // whole sub tree un-optimizable
  FULL: 1,     // whole sub tree optimizable
  SELF: 2,     // self optimizable but has some un-optimizable children
  CHILDREN: 3, // self un-optimizable but have fully optimizable children
  PARTIAL: 4   // self un-optimizable with some un-optimizable children
};

var isPlatformReservedTag;

function optimize (root, options) {
  if (!root) { return }
  isPlatformReservedTag = options.isReservedTag || no;
  walk(root, true);
}

function walk (node, isRoot) {
  if (isUnOptimizableTree(node)) {
    node.ssrOptimizability = optimizability.FALSE;
    return
  }
  // root node or nodes with custom directives should always be a VNode
  var selfUnoptimizable = isRoot || hasCustomDirective(node);
  var check = function (child) {
    if (child.ssrOptimizability !== optimizability.FULL) {
      node.ssrOptimizability = selfUnoptimizable
        ? optimizability.PARTIAL
        : optimizability.SELF;
    }
  };
  if (selfUnoptimizable) {
    node.ssrOptimizability = optimizability.CHILDREN;
  }
  if (node.type === 1) {
    for (var i = 0, l = node.children.length; i < l; i++) {
      var child = node.children[i];
      walk(child);
      check(child);
    }
    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;
        walk(block, isRoot);
        check(block);
      }
    }
    if (node.ssrOptimizability == null ||
      (!isRoot && (node.attrsMap['v-html'] || node.attrsMap['v-text']))
    ) {
      node.ssrOptimizability = optimizability.FULL;
    } else {
      node.children = optimizeSiblings(node);
    }
  } else {
    node.ssrOptimizability = optimizability.FULL;
  }
}

function optimizeSiblings (el) {
  var children = el.children;
  var optimizedChildren = [];

  var currentOptimizableGroup = [];
  var pushGroup = function () {
    if (currentOptimizableGroup.length) {
      optimizedChildren.push({
        type: 1,
        parent: el,
        tag: 'template',
        attrsList: [],
        attrsMap: {},
        rawAttrsMap: {},
        children: currentOptimizableGroup,
        ssrOptimizability: optimizability.FULL
      });
    }
    currentOptimizableGroup = [];
  };

  for (var i = 0; i < children.length; i++) {
    var c = children[i];
    if (c.ssrOptimizability === optimizability.FULL) {
      currentOptimizableGroup.push(c);
    } else {
      // wrap fully-optimizable adjacent siblings inside a template tag
      // so that they can be optimized into a single ssrNode by codegen
      pushGroup();
      optimizedChildren.push(c);
    }
  }
  pushGroup();
  return optimizedChildren
}

function isUnOptimizableTree (node) {
  if (node.type === 2 || node.type === 3) { // text or expression
    return false
  }
  return (
    isBuiltInTag(node.tag) || // built-in (slot, component)
    !isPlatformReservedTag(node.tag) || // custom component
    !!node.component || // "is" component
    isSelectWithModel(node) // <select v-model> requires runtime inspection
  )
}

var isBuiltInDir = makeMap('text,html,show,on,bind,model,pre,cloak,once');

function hasCustomDirective (node) {
  return (
    node.type === 1 &&
    node.directives &&
    node.directives.some(function (d) { return !isBuiltInDir(d.name); })
  )
}

// <select v-model> cannot be optimized because it requires a runtime check
// to determine proper selected option
function isSelectWithModel (node) {
  return (
    node.type === 1 &&
    node.tag === 'select' &&
    node.directives != null &&
    node.directives.some(function (d) { return d.name === 'model'; })
  )
}

/*  */




// segment types
var RAW = 0;
var INTERPOLATION = 1;
var EXPRESSION = 2;

function generate$1 (
  ast,
  options
) {
  var state = new CodegenState(options);
  var code = ast ? genSSRElement(ast, state) : '_c("div")';
  return {
    render: ("with(this){return " + code + "}"),
    staticRenderFns: state.staticRenderFns
  }
}

function genSSRElement (el, state) {
  if (el.for && !el.forProcessed) {
    return genFor(el, state, genSSRElement)
  } else if (el.if && !el.ifProcessed) {
    return genIf(el, state, genSSRElement)
  } else if (el.tag === 'template' && !el.slotTarget) {
    return el.ssrOptimizability === optimizability.FULL
      ? genChildrenAsStringNode(el, state)
      : genSSRChildren(el, state) || 'void 0'
  }

  switch (el.ssrOptimizability) {
    case optimizability.FULL:
      // stringify whole tree
      return genStringElement(el, state)
    case optimizability.SELF:
      // stringify self and check children
      return genStringElementWithChildren(el, state)
    case optimizability.CHILDREN:
      // generate self as VNode and stringify children
      return genNormalElement(el, state, true)
    case optimizability.PARTIAL:
      // generate self as VNode and check children
      return genNormalElement(el, state, false)
    default:
      // bail whole tree
      return genElement(el, state)
  }
}

function genNormalElement (el, state, stringifyChildren) {
  var data = el.plain ? undefined : genData$2(el, state);
  var children = stringifyChildren
    ? ("[" + (genChildrenAsStringNode(el, state)) + "]")
    : genSSRChildren(el, state, true);
  return ("_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")")
}

function genSSRChildren (el, state, checkSkip) {
  return genChildren(el, state, checkSkip, genSSRElement, genSSRNode)
}

function genSSRNode (el, state) {
  return el.type === 1
    ? genSSRElement(el, state)
    : genText(el)
}

function genChildrenAsStringNode (el, state) {
  return el.children.length
    ? ("_ssrNode(" + (flattenSegments(childrenToSegments(el, state))) + ")")
    : ''
}

function genStringElement (el, state) {
  return ("_ssrNode(" + (elementToString(el, state)) + ")")
}

function genStringElementWithChildren (el, state) {
  var children = genSSRChildren(el, state, true);
  return ("_ssrNode(" + (flattenSegments(elementToOpenTagSegments(el, state))) + ",\"</" + (el.tag) + ">\"" + (children ? ("," + children) : '') + ")")
}

function elementToString (el, state) {
  return ("(" + (flattenSegments(elementToSegments(el, state))) + ")")
}

function elementToSegments (el, state) {
  // v-for / v-if
  if (el.for && !el.forProcessed) {
    el.forProcessed = true;
    return [{
      type: EXPRESSION,
      value: genFor(el, state, elementToString, '_ssrList')
    }]
  } else if (el.if && !el.ifProcessed) {
    el.ifProcessed = true;
    return [{
      type: EXPRESSION,
      value: genIf(el, state, elementToString, '"<!---->"')
    }]
  } else if (el.tag === 'template') {
    return childrenToSegments(el, state)
  }

  var openSegments = elementToOpenTagSegments(el, state);
  var childrenSegments = childrenToSegments(el, state);
  var ref = state.options;
  var isUnaryTag = ref.isUnaryTag;
  var close = (isUnaryTag && isUnaryTag(el.tag))
    ? []
    : [{ type: RAW, value: ("</" + (el.tag) + ">") }];
  return openSegments.concat(childrenSegments, close)
}

function elementToOpenTagSegments (el, state) {
  applyModelTransform(el, state);
  var binding;
  var segments = [{ type: RAW, value: ("<" + (el.tag)) }];
  // attrs
  if (el.attrs) {
    segments.push.apply(segments, genAttrSegments(el.attrs));
  }
  // domProps
  if (el.props) {
    segments.push.apply(segments, genDOMPropSegments(el.props, el.attrs));
  }
  // v-bind="object"
  if ((binding = el.attrsMap['v-bind'])) {
    segments.push({ type: EXPRESSION, value: ("_ssrAttrs(" + binding + ")") });
  }
  // v-bind.prop="object"
  if ((binding = el.attrsMap['v-bind.prop'])) {
    segments.push({ type: EXPRESSION, value: ("_ssrDOMProps(" + binding + ")") });
  }
  // class
  if (el.staticClass || el.classBinding) {
    segments.push.apply(
      segments,
      genClassSegments(el.staticClass, el.classBinding)
    );
  }
  // style & v-show
  if (el.staticStyle || el.styleBinding || el.attrsMap['v-show']) {
    segments.push.apply(
      segments,
      genStyleSegments(
        el.attrsMap.style,
        el.staticStyle,
        el.styleBinding,
        el.attrsMap['v-show']
      )
    );
  }
  // _scopedId
  if (state.options.scopeId) {
    segments.push({ type: RAW, value: (" " + (state.options.scopeId)) });
  }
  segments.push({ type: RAW, value: ">" });
  return segments
}

function childrenToSegments (el, state) {
  var binding;
  if ((binding = el.attrsMap['v-html'])) {
    return [{ type: EXPRESSION, value: ("_s(" + binding + ")") }]
  }
  if ((binding = el.attrsMap['v-text'])) {
    return [{ type: INTERPOLATION, value: ("_s(" + binding + ")") }]
  }
  if (el.tag === 'textarea' && (binding = el.attrsMap['v-model'])) {
    return [{ type: INTERPOLATION, value: ("_s(" + binding + ")") }]
  }
  return el.children
    ? nodesToSegments(el.children, state)
    : []
}

function nodesToSegments (
  children,
  state
) {
  var segments = [];
  for (var i = 0; i < children.length; i++) {
    var c = children[i];
    if (c.type === 1) {
      segments.push.apply(segments, elementToSegments(c, state));
    } else if (c.type === 2) {
      segments.push({ type: INTERPOLATION, value: c.expression });
    } else if (c.type === 3) {
      var text = escape(c.text);
      if (c.isComment) {
        text = '<!--' + text + '-->';
      }
      segments.push({ type: RAW, value: text });
    }
  }
  return segments
}

function flattenSegments (segments) {
  var mergedSegments = [];
  var textBuffer = '';

  var pushBuffer = function () {
    if (textBuffer) {
      mergedSegments.push(JSON.stringify(textBuffer));
      textBuffer = '';
    }
  };

  for (var i = 0; i < segments.length; i++) {
    var s = segments[i];
    if (s.type === RAW) {
      textBuffer += s.value;
    } else if (s.type === INTERPOLATION) {
      pushBuffer();
      mergedSegments.push(("_ssrEscape(" + (s.value) + ")"));
    } else if (s.type === EXPRESSION) {
      pushBuffer();
      mergedSegments.push(("(" + (s.value) + ")"));
    }
  }
  pushBuffer();

  return mergedSegments.join('+')
}

/*  */



// 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)
    }
  }
}

/*  */

var createCompiler = createCompilerCreator(function baseCompile (
  template,
  options
) {
  var ast = parse(template.trim(), options);
  optimize(ast, options);
  var code = generate$1(ast, options);
  return {
    ast: ast,
    render: code.render,
    staticRenderFns: code.staticRenderFns
  }
});

/*  */

var ref = createCompiler(baseOptions);
var compile = ref.compile;
var compileToFunctions = ref.compileToFunctions;

/*  */

// 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
}

/*  */

var ssrHelpers = {
  _ssrEscape: escape,
  _ssrNode: renderStringNode,
  _ssrList: renderStringList,
  _ssrAttr: renderAttr,
  _ssrAttrs: renderAttrs$1,
  _ssrDOMProps: renderDOMProps$1,
  _ssrClass: renderSSRClass,
  _ssrStyle: renderSSRStyle
};

function installSSRHelpers (vm) {
  if (vm._ssrNode) {
    return
  }
  var Vue = vm.constructor;
  while (Vue.super) {
    Vue = Vue.super;
  }
  extend(Vue.prototype, ssrHelpers);
  if (Vue.FunctionalRenderContext) {
    extend(Vue.FunctionalRenderContext.prototype, ssrHelpers);
  }
}

var StringNode = function StringNode (
  open,
  close,
  children,
  normalizationType
) {
  this.isString = true;
  this.open = open;
  this.close = close;
  if (children) {
    this.children = normalizationType === 1
      ? simpleNormalizeChildren(children)
      : normalizationType === 2
        ? normalizeChildren(children)
        : children;
  } else {
    this.children = void 0;
  }
};

function renderStringNode (
  open,
  close,
  children,
  normalizationType
) {
  return new StringNode(open, close, children, normalizationType)
}

function renderStringList (
  val,
  render
) {
  var ret = '';
  var i, l, keys, key;
  if (Array.isArray(val) || typeof val === 'string') {
    for (i = 0, l = val.length; i < l; i++) {
      ret += render(val[i], i);
    }
  } else if (typeof val === 'number') {
    for (i = 0; i < val; i++) {
      ret += render(i + 1, i);
    }
  } else if (isObject(val)) {
    keys = Object.keys(val);
    for (i = 0, l = keys.length; i < l; i++) {
      key = keys[i];
      ret += render(val[key], key, i);
    }
  }
  return ret
}

function renderAttrs$1 (obj) {
  var res = '';
  for (var key in obj) {
    if (isSSRUnsafeAttr(key)) {
      continue
    }
    res += renderAttr(key, obj[key]);
  }
  return res
}

function renderDOMProps$1 (obj) {
  var res = '';
  for (var key in obj) {
    var attr = propsToAttrMap[key] || key.toLowerCase();
    if (isRenderableAttr(attr)) {
      res += renderAttr(attr, obj[key]);
    }
  }
  return res
}

function renderSSRClass (
  staticClass,
  dynamic
) {
  var res = renderClass(staticClass, dynamic);
  return res === '' ? res : (" class=\"" + (escape(res)) + "\"")
}

function renderSSRStyle (
  staticStyle,
  dynamic,
  extra
) {
  var style = {};
  if (staticStyle) { extend(style, staticStyle); }
  if (dynamic) { extend(style, normalizeStyleBinding(dynamic)); }
  if (extra) { extend(style, extra); }
  var res = genStyle(style);
  return res === '' ? res : (" style=" + (JSON.stringify(escape(res))))
}

/* not type checking this file because flow doesn't play well with Proxy */

{
  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 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 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 perf = inBrowser && window.performance;
  /* istanbul ignore if */
  if (
    perf &&
    perf.mark &&
    perf.measure &&
    perf.clearMarks &&
    perf.clearMeasures
  ) ;
}

/*  */

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 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
}

/*  */

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 ((!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);
  }
}

/*  */

/**
 * 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;
}

/*  */



/**
 * 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]; }
}

/*  */

var currentRenderingInstance = null;

/*  */

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
  }
}

/*  */

/*  */

/*  */

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;
}

/*  */

var activeInstance = null;

function updateChildComponent (
  vm,
  propsData,
  listeners,
  parentVnode,
  renderChildren
) {

  // 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();
  }
}

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();
}

/*  */

// 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(); };
  }
}

/**
 * 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;
}

/*  */

/*  */

/*  */

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
  }
}

/*  */

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 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 warned = Object.create(null);
var warnOnce = function (msg) {
  if (!warned[msg]) {
    warned[msg] = true;
    // eslint-disable-next-line no-console
    console.warn(("\n\u001b[31m" + msg + "\u001b[39m\n"));
  }
};

var onCompilationError = function (err, vm) {
  var trace = vm ? generateComponentTrace(vm) : '';
  throw new Error(("\n\u001b[31m" + err + trace + "\u001b[39m\n"))
};

var normalizeRender = function (vm) {
  var ref = vm.$options;
  var render = ref.render;
  var template = ref.template;
  var _scopeId = ref._scopeId;
  if (isUndef(render)) {
    if (template) {
      var compiled = compileToFunctions(template, {
        scopeId: _scopeId,
        warn: onCompilationError
      }, vm);

      vm.$options.render = compiled.render;
      vm.$options.staticRenderFns = compiled.staticRenderFns;
    } else {
      throw new Error(
        ("render function or template not defined in component: " + (vm.$options.name || vm.$options._componentTag || 'anonymous'))
      )
    }
  }
};

function waitForServerPrefetch (vm, resolve, reject) {
  var handlers = vm.$options.serverPrefetch;
  if (isDef(handlers)) {
    if (!Array.isArray(handlers)) { handlers = [handlers]; }
    try {
      var promises = [];
      for (var i = 0, j = handlers.length; i < j; i++) {
        var result = handlers[i].call(vm, vm);
        if (result && typeof result.then === 'function') {
          promises.push(result);
        }
      }
      Promise.all(promises).then(resolve).catch(reject);
      return
    } catch (e) {
      reject(e);
    }
  }
  resolve();
}

function renderNode (node, isRoot, context) {
  if (node.isString) {
    renderStringNode$1(node, context);
  } else if (isDef(node.componentOptions)) {
    renderComponent(node, isRoot, context);
  } else if (isDef(node.tag)) {
    renderElement(node, isRoot, context);
  } else if (isTrue(node.isComment)) {
    if (isDef(node.asyncFactory)) {
      // async component
      renderAsyncComponent(node, isRoot, context);
    } else {
      context.write(("<!--" + (node.text) + "-->"), context.next);
    }
  } else {
    context.write(
      node.raw ? node.text : escape(String(node.text)),
      context.next
    );
  }
}

function registerComponentForCache (options, write) {
  // exposed by vue-loader, need to call this if cache hit because
  // component lifecycle hooks will not be called.
  var register = options._ssrRegister;
  if (write.caching && isDef(register)) {
    write.componentBuffer[write.componentBuffer.length - 1].add(register);
  }
  return register
}

function renderComponent (node, isRoot, context) {
  var write = context.write;
  var next = context.next;
  var userContext = context.userContext;

  // check cache hit
  var Ctor = node.componentOptions.Ctor;
  var getKey = Ctor.options.serverCacheKey;
  var name = Ctor.options.name;
  var cache = context.cache;
  var registerComponent = registerComponentForCache(Ctor.options, write);

  if (isDef(getKey) && isDef(cache) && isDef(name)) {
    var rawKey = getKey(node.componentOptions.propsData);
    if (rawKey === false) {
      renderComponentInner(node, isRoot, context);
      return
    }
    var key = name + '::' + rawKey;
    var has = context.has;
    var get = context.get;
    if (isDef(has)) {
      has(key, function (hit) {
        if (hit === true && isDef(get)) {
          get(key, function (res) {
            if (isDef(registerComponent)) {
              registerComponent(userContext);
            }
            res.components.forEach(function (register) { return register(userContext); });
            write(res.html, next);
          });
        } else {
          renderComponentWithCache(node, isRoot, key, context);
        }
      });
    } else if (isDef(get)) {
      get(key, function (res) {
        if (isDef(res)) {
          if (isDef(registerComponent)) {
            registerComponent(userContext);
          }
          res.components.forEach(function (register) { return register(userContext); });
          write(res.html, next);
        } else {
          renderComponentWithCache(node, isRoot, key, context);
        }
      });
    }
  } else {
    if (isDef(getKey) && isUndef(cache)) {
      warnOnce(
        "[vue-server-renderer] Component " + (Ctor.options.name || '(anonymous)') + " implemented serverCacheKey, " +
        'but no cache was provided to the renderer.'
      );
    }
    if (isDef(getKey) && isUndef(name)) {
      warnOnce(
        "[vue-server-renderer] Components that implement \"serverCacheKey\" " +
        "must also define a unique \"name\" option."
      );
    }
    renderComponentInner(node, isRoot, context);
  }
}

function renderComponentWithCache (node, isRoot, key, context) {
  var write = context.write;
  write.caching = true;
  var buffer = write.cacheBuffer;
  var bufferIndex = buffer.push('') - 1;
  var componentBuffer = write.componentBuffer;
  componentBuffer.push(new Set());
  context.renderStates.push({
    type: 'ComponentWithCache',
    key: key,
    buffer: buffer,
    bufferIndex: bufferIndex,
    componentBuffer: componentBuffer
  });
  renderComponentInner(node, isRoot, context);
}

function renderComponentInner (node, isRoot, context) {
  var prevActive = context.activeInstance;
  // expose userContext on vnode
  node.ssrContext = context.userContext;
  var child = context.activeInstance = createComponentInstanceForVnode(
    node,
    context.activeInstance
  );
  normalizeRender(child);

  var resolve = function () {
    var childNode = child._render();
    childNode.parent = node;
    context.renderStates.push({
      type: 'Component',
      prevActive: prevActive
    });
    renderNode(childNode, isRoot, context);
  };

  var reject = context.done;

  waitForServerPrefetch(child, resolve, reject);
}

function renderAsyncComponent (node, isRoot, context) {
  var factory = node.asyncFactory;

  var resolve = function (comp) {
    if (comp.__esModule && comp.default) {
      comp = comp.default;
    }
    var ref = node.asyncMeta;
    var data = ref.data;
    var children = ref.children;
    var tag = ref.tag;
    var nodeContext = node.asyncMeta.context;
    var resolvedNode = createComponent(
      comp,
      data,
      nodeContext,
      children,
      tag
    );
    if (resolvedNode) {
      if (resolvedNode.componentOptions) {
        // normal component
        renderComponent(resolvedNode, isRoot, context);
      } else if (!Array.isArray(resolvedNode)) {
        // single return node from functional component
        renderNode(resolvedNode, isRoot, context);
      } else {
        // multiple return nodes from functional component
        context.renderStates.push({
          type: 'Fragment',
          children: resolvedNode,
          rendered: 0,
          total: resolvedNode.length
        });
        context.next();
      }
    } else {
      // invalid component, but this does not throw on the client
      // so render empty comment node
      context.write("<!---->", context.next);
    }
  };

  if (factory.resolved) {
    resolve(factory.resolved);
    return
  }

  var reject = context.done;
  var res;
  try {
    res = factory(resolve, reject);
  } catch (e) {
    reject(e);
  }
  if (res) {
    if (typeof res.then === 'function') {
      res.then(resolve, reject).catch(reject);
    } else {
      // new syntax in 2.3
      var comp = res.component;
      if (comp && typeof comp.then === 'function') {
        comp.then(resolve, reject).catch(reject);
      }
    }
  }
}

function renderStringNode$1 (el, context) {
  var write = context.write;
  var next = context.next;
  if (isUndef(el.children) || el.children.length === 0) {
    write(el.open + (el.close || ''), next);
  } else {
    var children = el.children;
    context.renderStates.push({
      type: 'Element',
      children: children,
      rendered: 0,
      total: children.length,
      endTag: el.close
    });
    write(el.open, next);
  }
}

function renderElement (el, isRoot, context) {
  var write = context.write;
  var next = context.next;

  if (isTrue(isRoot)) {
    if (!el.data) { el.data = {}; }
    if (!el.data.attrs) { el.data.attrs = {}; }
    el.data.attrs[SSR_ATTR] = 'true';
  }

  if (el.fnOptions) {
    registerComponentForCache(el.fnOptions, write);
  }

  var startTag = renderStartingTag(el, context);
  var endTag = "</" + (el.tag) + ">";
  if (context.isUnaryTag(el.tag)) {
    write(startTag, next);
  } else if (isUndef(el.children) || el.children.length === 0) {
    write(startTag + endTag, next);
  } else {
    var children = el.children;
    context.renderStates.push({
      type: 'Element',
      children: children,
      rendered: 0,
      total: children.length,
      endTag: endTag
    });
    write(startTag, next);
  }
}

function hasAncestorData (node) {
  var parentNode = node.parent;
  return isDef(parentNode) && (isDef(parentNode.data) || hasAncestorData(parentNode))
}

function getVShowDirectiveInfo (node) {
  var dir;
  var tmp;

  while (isDef(node)) {
    if (node.data && node.data.directives) {
      tmp = node.data.directives.find(function (dir) { return dir.name === 'show'; });
      if (tmp) {
        dir = tmp;
      }
    }
    node = node.parent;
  }
  return dir
}

function renderStartingTag (node, context) {
  var markup = "<" + (node.tag);
  var directives = context.directives;
  var modules = context.modules;

  // construct synthetic data for module processing
  // because modules like style also produce code by parent VNode data
  if (isUndef(node.data) && hasAncestorData(node)) {
    node.data = {};
  }
  if (isDef(node.data)) {
    // check directives
    var dirs = node.data.directives;
    if (dirs) {
      for (var i = 0; i < dirs.length; i++) {
        var name = dirs[i].name;
        if (name !== 'show') {
          var dirRenderer = resolveAsset(context, 'directives', name);
          if (dirRenderer) {
            // directives mutate the node's data
            // which then gets rendered by modules
            dirRenderer(node, dirs[i]);
          }
        }
      }
    }

    // v-show directive needs to be merged from parent to child
    var vshowDirectiveInfo = getVShowDirectiveInfo(node);
    if (vshowDirectiveInfo) {
      directives.show(node, vshowDirectiveInfo);
    }

    // apply other modules
    for (var i$1 = 0; i$1 < modules.length; i$1++) {
      var res = modules[i$1](node);
      if (res) {
        markup += res;
      }
    }
  }
  // attach scoped CSS ID
  var scopeId;
  var activeInstance = context.activeInstance;
  if (isDef(activeInstance) &&
    activeInstance !== node.context &&
    isDef(scopeId = activeInstance.$options._scopeId)
  ) {
    markup += " " + ((scopeId));
  }
  if (isDef(node.fnScopeId)) {
    markup += " " + (node.fnScopeId);
  } else {
    while (isDef(node)) {
      if (isDef(scopeId = node.context.$options._scopeId)) {
        markup += " " + scopeId;
      }
      node = node.parent;
    }
  }
  return markup + '>'
}

function createRenderFunction (
  modules,
  directives,
  isUnaryTag,
  cache
) {
  return function render (
    component,
    write,
    userContext,
    done
  ) {
    warned = Object.create(null);
    var context = new RenderContext({
      activeInstance: component,
      userContext: userContext,
      write: write, done: done, renderNode: renderNode,
      isUnaryTag: isUnaryTag, modules: modules, directives: directives,
      cache: cache
    });
    installSSRHelpers(component);
    normalizeRender(component);

    var resolve = function () {
      renderNode(component._render(), true, context);
    };
    waitForServerPrefetch(component, resolve, done);
  }
}

/*  */

var isJS = function (file) { return /\.js(\?[^.]+)?$/.test(file); };

var isCSS = function (file) { return /\.css(\?[^.]+)?$/.test(file); };

function createPromiseCallback () {
  var resolve, reject;
  var promise = new Promise(function (_resolve, _reject) {
    resolve = _resolve;
    reject = _reject;
  });
  var cb = function (err, res) {
    if (err) { return reject(err) }
    resolve(res || '');
  };
  return { promise: promise, cb: cb }
}

/*  */

var Transform = require('stream').Transform;



var TemplateStream = /*@__PURE__*/(function (Transform) {
  function TemplateStream (
    renderer,
    template,
    context
  ) {
    Transform.call(this);
    this.started = false;
    this.renderer = renderer;
    this.template = template;
    this.context = context || {};
    this.inject = renderer.inject;
  }

  if ( Transform ) TemplateStream.__proto__ = Transform;
  TemplateStream.prototype = Object.create( Transform && Transform.prototype );
  TemplateStream.prototype.constructor = TemplateStream;

  TemplateStream.prototype._transform = function _transform (data, encoding, done) {
    if (!this.started) {
      this.emit('beforeStart');
      this.start();
    }
    this.push(data);
    done();
  };

  TemplateStream.prototype.start = function start () {
    this.started = true;
    this.push(this.template.head(this.context));

    if (this.inject) {
      // inline server-rendered head meta information
      if (this.context.head) {
        this.push(this.context.head);
      }

      // inline preload/prefetch directives for initial/async chunks
      var links = this.renderer.renderResourceHints(this.context);
      if (links) {
        this.push(links);
      }

      // CSS files and inline server-rendered CSS collected by vue-style-loader
      var styles = this.renderer.renderStyles(this.context);
      if (styles) {
        this.push(styles);
      }
    }

    this.push(this.template.neck(this.context));
  };

  TemplateStream.prototype._flush = function _flush (done) {
    this.emit('beforeEnd');

    if (this.inject) {
      // inline initial store state
      var state = this.renderer.renderState(this.context);
      if (state) {
        this.push(state);
      }

      // embed scripts needed
      var scripts = this.renderer.renderScripts(this.context);
      if (scripts) {
        this.push(scripts);
      }
    }

    this.push(this.template.tail(this.context));
    done();
  };

  return TemplateStream;
}(Transform));

/*  */

var compile$1 = require('lodash.template');
var compileOptions = {
  escape: /{{([^{][\s\S]+?[^}])}}/g,
  interpolate: /{{{([\s\S]+?)}}}/g
};



function parseTemplate (
  template,
  contentPlaceholder
) {
  if ( contentPlaceholder === void 0 ) contentPlaceholder = '<!--vue-ssr-outlet-->';

  if (typeof template === 'object') {
    return template
  }

  var i = template.indexOf('</head>');
  var j = template.indexOf(contentPlaceholder);

  if (j < 0) {
    throw new Error("Content placeholder not found in template.")
  }

  if (i < 0) {
    i = template.indexOf('<body>');
    if (i < 0) {
      i = j;
    }
  }

  return {
    head: compile$1(template.slice(0, i), compileOptions),
    neck: compile$1(template.slice(i, j), compileOptions),
    tail: compile$1(template.slice(j + contentPlaceholder.length), compileOptions)
  }
}

/*  */

/**
 * Creates a mapper that maps components used during a server-side render
 * to async chunk files in the client-side build, so that we can inline them
 * directly in the rendered HTML to avoid waterfall requests.
 */





function createMapper (
  clientManifest
) {
  var map = createMap(clientManifest);
  // map server-side moduleIds to client-side files
  return function mapper (moduleIds) {
    var res = new Set();
    for (var i = 0; i < moduleIds.length; i++) {
      var mapped = map.get(moduleIds[i]);
      if (mapped) {
        for (var j = 0; j < mapped.length; j++) {
          res.add(mapped[j]);
        }
      }
    }
    return Array.from(res)
  }
}

function createMap (clientManifest) {
  var map = new Map();
  Object.keys(clientManifest.modules).forEach(function (id) {
    map.set(id, mapIdToFile(id, clientManifest));
  });
  return map
}

function mapIdToFile (id, clientManifest) {
  var files = [];
  var fileIndices = clientManifest.modules[id];
  if (fileIndices) {
    fileIndices.forEach(function (index) {
      var file = clientManifest.all[index];
      // only include async files or non-js, non-css assets
      if (
        file &&
        (clientManifest.async.indexOf(file) > -1 ||
          !/\.(js|css)($|\?)/.test(file))
      ) {
        files.push(file);
      }
    });
  }
  return files
}

/*  */

var path = require('path');
var serialize = require('serialize-javascript');









var TemplateRenderer = function TemplateRenderer (options) {
  this.options = options;
  this.inject = options.inject !== false;
  // if no template option is provided, the renderer is created
  // as a utility object for rendering assets like preload links and scripts.
    
  var template = options.template;
  this.parsedTemplate = template
    ? typeof template === 'string'
      ? parseTemplate(template)
      : template
    : null;

  // function used to serialize initial state JSON
  this.serialize = options.serializer || (function (state) {
    return serialize(state, { isJSON: true })
  });

  // extra functionality with client manifest
  if (options.clientManifest) {
    var clientManifest = this.clientManifest = options.clientManifest;
    // ensure publicPath ends with /
    this.publicPath = clientManifest.publicPath === ''
      ? ''
      : clientManifest.publicPath.replace(/([^\/])$/, '$1/');
    // preload/prefetch directives
    this.preloadFiles = (clientManifest.initial || []).map(normalizeFile);
    this.prefetchFiles = (clientManifest.async || []).map(normalizeFile);
    // initial async chunk mapping
    this.mapFiles = createMapper(clientManifest);
  }
};

TemplateRenderer.prototype.bindRenderFns = function bindRenderFns (context) {
  var renderer = this
  ;['ResourceHints', 'State', 'Scripts', 'Styles'].forEach(function (type) {
    context[("render" + type)] = renderer[("render" + type)].bind(renderer, context);
  });
  // also expose getPreloadFiles, useful for HTTP/2 push
  context.getPreloadFiles = renderer.getPreloadFiles.bind(renderer, context);
};

// render synchronously given rendered app content and render context
TemplateRenderer.prototype.render = function render (content, context) {
  var template = this.parsedTemplate;
  if (!template) {
    throw new Error('render cannot be called without a template.')
  }
  context = context || {};

  if (typeof template === 'function') {
    return template(content, context)
  }

  if (this.inject) {
    return (
      template.head(context) +
      (context.head || '') +
      this.renderResourceHints(context) +
      this.renderStyles(context) +
      template.neck(context) +
      content +
      this.renderState(context) +
      this.renderScripts(context) +
      template.tail(context)
    )
  } else {
    return (
      template.head(context) +
      template.neck(context) +
      content +
      template.tail(context)
    )
  }
};

TemplateRenderer.prototype.renderStyles = function renderStyles (context) {
    var this$1 = this;

  var initial = this.preloadFiles || [];
  var async = this.getUsedAsyncFiles(context) || [];
  var cssFiles = initial.concat(async).filter(function (ref) {
      var file = ref.file;

      return isCSS(file);
    });
  return (
    // render links for css files
    (cssFiles.length
      ? cssFiles.map(function (ref) {
          var file = ref.file;

          return ("<link rel=\"stylesheet\" href=\"" + (this$1.publicPath) + file + "\">");
    }).join('')
      : '') +
    // context.styles is a getter exposed by vue-style-loader which contains
    // the inline component styles collected during SSR
    (context.styles || '')
  )
};

TemplateRenderer.prototype.renderResourceHints = function renderResourceHints (context) {
  return this.renderPreloadLinks(context) + this.renderPrefetchLinks(context)
};

TemplateRenderer.prototype.getPreloadFiles = function getPreloadFiles (context) {
  var usedAsyncFiles = this.getUsedAsyncFiles(context);
  if (this.preloadFiles || usedAsyncFiles) {
    return (this.preloadFiles || []).concat(usedAsyncFiles || [])
  } else {
    return []
  }
};

TemplateRenderer.prototype.renderPreloadLinks = function renderPreloadLinks (context) {
    var this$1 = this;

  var files = this.getPreloadFiles(context);
  var shouldPreload = this.options.shouldPreload;
  if (files.length) {
    return files.map(function (ref) {
        var file = ref.file;
        var extension = ref.extension;
        var fileWithoutQuery = ref.fileWithoutQuery;
        var asType = ref.asType;

      var extra = '';
      // by default, we only preload scripts or css
      if (!shouldPreload && asType !== 'script' && asType !== 'style') {
        return ''
      }
      // user wants to explicitly control what to preload
      if (shouldPreload && !shouldPreload(fileWithoutQuery, asType)) {
        return ''
      }
      if (asType === 'font') {
        extra = " type=\"font/" + extension + "\" crossorigin";
      }
      return ("<link rel=\"preload\" href=\"" + (this$1.publicPath) + file + "\"" + (asType !== '' ? (" as=\"" + asType + "\"") : '') + extra + ">")
    }).join('')
  } else {
    return ''
  }
};

TemplateRenderer.prototype.renderPrefetchLinks = function renderPrefetchLinks (context) {
    var this$1 = this;

  var shouldPrefetch = this.options.shouldPrefetch;
  if (this.prefetchFiles) {
    var usedAsyncFiles = this.getUsedAsyncFiles(context);
    var alreadyRendered = function (file) {
      return usedAsyncFiles && usedAsyncFiles.some(function (f) { return f.file === file; })
    };
    return this.prefetchFiles.map(function (ref) {
        var file = ref.file;
        var fileWithoutQuery = ref.fileWithoutQuery;
        var asType = ref.asType;

      if (shouldPrefetch && !shouldPrefetch(fileWithoutQuery, asType)) {
        return ''
      }
      if (alreadyRendered(file)) {
        return ''
      }
      return ("<link rel=\"prefetch\" href=\"" + (this$1.publicPath) + file + "\">")
    }).join('')
  } else {
    return ''
  }
};

TemplateRenderer.prototype.renderState = function renderState (context, options) {
  var ref = options || {};
    var contextKey = ref.contextKey; if ( contextKey === void 0 ) contextKey = 'state';
    var windowKey = ref.windowKey; if ( windowKey === void 0 ) windowKey = '__INITIAL_STATE__';
  var state = this.serialize(context[contextKey]);
  var autoRemove = '';
  var nonceAttr = context.nonce ? (" nonce=\"" + (context.nonce) + "\"") : '';
  return context[contextKey]
    ? ("<script" + nonceAttr + ">window." + windowKey + "=" + state + autoRemove + "</script>")
    : ''
};

TemplateRenderer.prototype.renderScripts = function renderScripts (context) {
    var this$1 = this;

  if (this.clientManifest) {
    var initial = this.preloadFiles.filter(function (ref) {
        var file = ref.file;

        return isJS(file);
      });
    var async = (this.getUsedAsyncFiles(context) || []).filter(function (ref) {
        var file = ref.file;

        return isJS(file);
      });
    var needed = [initial[0]].concat(async, initial.slice(1));
    return needed.map(function (ref) {
        var file = ref.file;

      return ("<script src=\"" + (this$1.publicPath) + file + "\" defer></script>")
    }).join('')
  } else {
    return ''
  }
};

TemplateRenderer.prototype.getUsedAsyncFiles = function getUsedAsyncFiles (context) {
  if (!context._mappedFiles && context._registeredComponents && this.mapFiles) {
    var registered = Array.from(context._registeredComponents);
    context._mappedFiles = this.mapFiles(registered).map(normalizeFile);
  }
  return context._mappedFiles
};

// create a transform stream
TemplateRenderer.prototype.createStream = function createStream (context) {
  if (!this.parsedTemplate) {
    throw new Error('createStream cannot be called without a template.')
  }
  return new TemplateStream(this, this.parsedTemplate, context || {})
};

function normalizeFile (file) {
  var withoutQuery = file.replace(/\?.*/, '');
  var extension = path.extname(withoutQuery).slice(1);
  return {
    file: file,
    extension: extension,
    fileWithoutQuery: withoutQuery,
    asType: getPreloadType(extension)
  }
}

function getPreloadType (ext) {
  if (ext === 'js') {
    return 'script'
  } else if (ext === 'css') {
    return 'style'
  } else if (/jpe?g|png|svg|gif|webp|ico/.test(ext)) {
    return 'image'
  } else if (/woff2?|ttf|otf|eot/.test(ext)) {
    return 'font'
  } else {
    // not exhausting all possibilities here, but above covers common cases
    return ''
  }
}

/*  */








function createRenderer (ref) {
  if ( ref === void 0 ) ref = {};
  var modules = ref.modules; if ( modules === void 0 ) modules = [];
  var directives = ref.directives; if ( directives === void 0 ) directives = {};
  var isUnaryTag = ref.isUnaryTag; if ( isUnaryTag === void 0 ) isUnaryTag = (function () { return false; });
  var template = ref.template;
  var inject = ref.inject;
  var cache = ref.cache;
  var shouldPreload = ref.shouldPreload;
  var shouldPrefetch = ref.shouldPrefetch;
  var clientManifest = ref.clientManifest;
  var serializer = ref.serializer;

  var render = createRenderFunction(modules, directives, isUnaryTag, cache);
  var templateRenderer = new TemplateRenderer({
    template: template,
    inject: inject,
    shouldPreload: shouldPreload,
    shouldPrefetch: shouldPrefetch,
    clientManifest: clientManifest,
    serializer: serializer
  });

  return {
    renderToString: function renderToString (
      component,
      context,
      cb
    ) {
      var assign;

      if (typeof context === 'function') {
        cb = context;
        context = {};
      }
      if (context) {
        templateRenderer.bindRenderFns(context);
      }

      // no callback, return Promise
      var promise;
      if (!cb) {
        ((assign = createPromiseCallback(), promise = assign.promise, cb = assign.cb));
      }

      var result = '';
      var write = createWriteFunction(function (text) {
        result += text;
        return false
      }, cb);
      try {
        render(component, write, context, function (err) {
          if (err) {
            return cb(err)
          }
          if (context && context.rendered) {
            context.rendered(context);
          }
          if (template) {
            try {
              var res = templateRenderer.render(result, context);
              if (typeof res !== 'string') {
                // function template returning promise
                res
                  .then(function (html) { return cb(null, html); })
                  .catch(cb);
              } else {
                cb(null, res);
              }
            } catch (e) {
              cb(e);
            }
          } else {
            cb(null, result);
          }
        });
      } catch (e) {
        cb(e);
      }

      return promise
    },

    renderToStream: function renderToStream (
      component,
      context
    ) {
      if (context) {
        templateRenderer.bindRenderFns(context);
      }
      var renderStream = new RenderStream(function (write, done) {
        render(component, write, context, done);
      });
      if (!template) {
        if (context && context.rendered) {
          var rendered = context.rendered;
          renderStream.once('beforeEnd', function () {
            rendered(context);
          });
        }
        return renderStream
      } else if (typeof template === 'function') {
        throw new Error("function template is only supported in renderToString.")
      } else {
        var templateStream = templateRenderer.createStream(context);
        renderStream.on('error', function (err) {
          templateStream.emit('error', err);
        });
        renderStream.pipe(templateStream);
        if (context && context.rendered) {
          var rendered$1 = context.rendered;
          renderStream.once('beforeEnd', function () {
            rendered$1(context);
          });
        }
        return templateStream
      }
    }
  }
}

var vm = require('vm');
var path$1 = require('path');
var resolve = require('resolve');
var NativeModule = require('module');

function createSandbox (context) {
  var sandbox = {
    Buffer: Buffer,
    console: console,
    process: process,
    setTimeout: setTimeout,
    setInterval: setInterval,
    setImmediate: setImmediate,
    clearTimeout: clearTimeout,
    clearInterval: clearInterval,
    clearImmediate: clearImmediate,
    __VUE_SSR_CONTEXT__: context
  };
  sandbox.global = sandbox;
  return sandbox
}

function compileModule (files, basedir, runInNewContext) {
  var compiledScripts = {};
  var resolvedModules = {};

  function getCompiledScript (filename) {
    if (compiledScripts[filename]) {
      return compiledScripts[filename]
    }
    var code = files[filename];
    var wrapper = NativeModule.wrap(code);
    var script = new vm.Script(wrapper, {
      filename: filename,
      displayErrors: true
    });
    compiledScripts[filename] = script;
    return script
  }

  function evaluateModule (filename, sandbox, evaluatedFiles) {
    if ( evaluatedFiles === void 0 ) evaluatedFiles = {};

    if (evaluatedFiles[filename]) {
      return evaluatedFiles[filename]
    }

    var script = getCompiledScript(filename);
    var compiledWrapper = runInNewContext === false
      ? script.runInThisContext()
      : script.runInNewContext(sandbox);
    var m = { exports: {}};
    var r = function (file) {
      file = path$1.posix.join('.', file);
      if (files[file]) {
        return evaluateModule(file, sandbox, evaluatedFiles)
      } else if (basedir) {
        return require(
          resolvedModules[file] ||
          (resolvedModules[file] = resolve.sync(file, { basedir: basedir }))
        )
      } else {
        return require(file)
      }
    };
    compiledWrapper.call(m.exports, m.exports, r, m);

    var res = Object.prototype.hasOwnProperty.call(m.exports, 'default')
      ? m.exports.default
      : m.exports;
    evaluatedFiles[filename] = res;
    return res
  }
  return evaluateModule
}

function deepClone (val) {
  if (isPlainObject(val)) {
    var res = {};
    for (var key in val) {
      res[key] = deepClone(val[key]);
    }
    return res
  } else if (Array.isArray(val)) {
    return val.slice()
  } else {
    return val
  }
}

function createBundleRunner (entry, files, basedir, runInNewContext) {
  var evaluate = compileModule(files, basedir, runInNewContext);
  if (runInNewContext !== false && runInNewContext !== 'once') {
    // new context mode: creates a fresh context and re-evaluate the bundle
    // on each render. Ensures entire application state is fresh for each
    // render, but incurs extra evaluation cost.
    return function (userContext) {
      if ( userContext === void 0 ) userContext = {};

      return new Promise(function (resolve) {
      userContext._registeredComponents = new Set();
      var res = evaluate(entry, createSandbox(userContext));
      resolve(typeof res === 'function' ? res(userContext) : res);
    });
    }
  } else {
    // direct mode: instead of re-evaluating the whole bundle on
    // each render, it simply calls the exported function. This avoids the
    // module evaluation costs but requires the source code to be structured
    // slightly differently.
    var runner; // lazy creation so that errors can be caught by user
    var initialContext;
    return function (userContext) {
      if ( userContext === void 0 ) userContext = {};

      return new Promise(function (resolve) {
      if (!runner) {
        var sandbox = runInNewContext === 'once'
          ? createSandbox()
          : global;
        // the initial context is only used for collecting possible non-component
        // styles injected by vue-style-loader.
        initialContext = sandbox.__VUE_SSR_CONTEXT__ = {};
        runner = evaluate(entry, sandbox);
        // On subsequent renders, __VUE_SSR_CONTEXT__ will not be available
        // to prevent cross-request pollution.
        delete sandbox.__VUE_SSR_CONTEXT__;
        if (typeof runner !== 'function') {
          throw new Error(
            'bundle export should be a function when using ' +
            '{ runInNewContext: false }.'
          )
        }
      }
      userContext._registeredComponents = new Set();

      // vue-style-loader styles imported outside of component lifecycle hooks
      if (initialContext._styles) {
        userContext._styles = deepClone(initialContext._styles);
        // #6353 ensure "styles" is exposed even if no styles are injected
        // in component lifecycles.
        // the renderStyles fn is exposed by vue-style-loader >= 3.0.3
        var renderStyles = initialContext._renderStyles;
        if (renderStyles) {
          Object.defineProperty(userContext, 'styles', {
            enumerable: true,
            get: function get () {
              return renderStyles(userContext._styles)
            }
          });
        }
      }

      resolve(runner(userContext));
    });
    }
  }
}

/*  */

var SourceMapConsumer = require('source-map').SourceMapConsumer;

var filenameRE = /\(([^)]+\.js):(\d+):(\d+)\)$/;

function createSourceMapConsumers (rawMaps) {
  var maps = {};
  Object.keys(rawMaps).forEach(function (file) {
    maps[file] = new SourceMapConsumer(rawMaps[file]);
  });
  return maps
}

function rewriteErrorTrace (e, mapConsumers) {
  if (e && typeof e.stack === 'string') {
    e.stack = e.stack.split('\n').map(function (line) {
      return rewriteTraceLine(line, mapConsumers)
    }).join('\n');
  }
}

function rewriteTraceLine (trace, mapConsumers) {
  var m = trace.match(filenameRE);
  var map = m && mapConsumers[m[1]];
  if (m != null && map) {
    var originalPosition = map.originalPositionFor({
      line: Number(m[2]),
      column: Number(m[3])
    });
    if (originalPosition.source != null) {
      var source = originalPosition.source;
      var line = originalPosition.line;
      var column = originalPosition.column;
      var mappedPosition = "(" + (source.replace(/^webpack:\/\/\//, '')) + ":" + (String(line)) + ":" + (String(column)) + ")";
      return trace.replace(filenameRE, mappedPosition)
    } else {
      return trace
    }
  } else {
    return trace
  }
}

/*  */

var fs = require('fs');
var path$2 = require('path');
var PassThrough = require('stream').PassThrough;

var INVALID_MSG =
  'Invalid server-rendering bundle format. Should be a string ' +
  'or a bundle Object of type:\n\n' +
"{\n  entry: string;\n  files: { [filename: string]: string; };\n  maps: { [filename: string]: string; };\n}\n";

// The render bundle can either be a string (single bundled file)
// or a bundle manifest object generated by vue-ssr-webpack-plugin.


function createBundleRendererCreator (
  createRenderer
) {
  return function createBundleRenderer (
    bundle,
    rendererOptions
  ) {
    if ( rendererOptions === void 0 ) rendererOptions = {};

    var files, entry, maps;
    var basedir = rendererOptions.basedir;

    // load bundle if given filepath
    if (
      typeof bundle === 'string' &&
      /\.js(on)?$/.test(bundle) &&
      path$2.isAbsolute(bundle)
    ) {
      if (fs.existsSync(bundle)) {
        var isJSON = /\.json$/.test(bundle);
        basedir = basedir || path$2.dirname(bundle);
        bundle = fs.readFileSync(bundle, 'utf-8');
        if (isJSON) {
          try {
            bundle = JSON.parse(bundle);
          } catch (e) {
            throw new Error(("Invalid JSON bundle file: " + bundle))
          }
        }
      } else {
        throw new Error(("Cannot locate bundle file: " + bundle))
      }
    }

    if (typeof bundle === 'object') {
      entry = bundle.entry;
      files = bundle.files;
      basedir = basedir || bundle.basedir;
      maps = createSourceMapConsumers(bundle.maps);
      if (typeof entry !== 'string' || typeof files !== 'object') {
        throw new Error(INVALID_MSG)
      }
    } else if (typeof bundle === 'string') {
      entry = '__vue_ssr_bundle__';
      files = { '__vue_ssr_bundle__': bundle };
      maps = {};
    } else {
      throw new Error(INVALID_MSG)
    }

    var renderer = createRenderer(rendererOptions);

    var run = createBundleRunner(
      entry,
      files,
      basedir,
      rendererOptions.runInNewContext
    );

    return {
      renderToString: function (context, cb) {
        var assign;

        if (typeof context === 'function') {
          cb = context;
          context = {};
        }

        var promise;
        if (!cb) {
          ((assign = createPromiseCallback(), promise = assign.promise, cb = assign.cb));
        }

        run(context).catch(function (err) {
          rewriteErrorTrace(err, maps);
          cb(err);
        }).then(function (app) {
          if (app) {
            renderer.renderToString(app, context, function (err, res) {
              rewriteErrorTrace(err, maps);
              cb(err, res);
            });
          }
        });

        return promise
      },

      renderToStream: function (context) {
        var res = new PassThrough();
        run(context).catch(function (err) {
          rewriteErrorTrace(err, maps);
          // avoid emitting synchronously before user can
          // attach error listener
          process.nextTick(function () {
            res.emit('error', err);
          });
        }).then(function (app) {
          if (app) {
            var renderStream = renderer.renderToStream(app, context);

            renderStream.on('error', function (err) {
              rewriteErrorTrace(err, maps);
              res.emit('error', err);
            });

            // relay HTMLStream special events
            if (rendererOptions && rendererOptions.template) {
              renderStream.on('beforeStart', function () {
                res.emit('beforeStart');
              });
              renderStream.on('beforeEnd', function () {
                res.emit('beforeEnd');
              });
            }

            renderStream.pipe(res);
          }
        });

        return res
      }
    }
  }
}

/*  */

process.env.VUE_ENV = 'server';

function createRenderer$1 (options) {
  if ( options === void 0 ) options = {};

  return createRenderer(extend(extend({}, options), {
    isUnaryTag: isUnaryTag,
    canBeLeftOpenTag: canBeLeftOpenTag,
    modules: modules,
    // user can provide server-side implementations for custom directives
    // when creating the renderer.
    directives: extend(baseDirectives, options.directives)
  }))
}

var createBundleRenderer = createBundleRendererCreator(createRenderer$1);

exports.createRenderer = createRenderer$1;
exports.createBundleRenderer = createBundleRenderer;