videoRTP.js

var videoRTP = (function (exports) {
  'use strict';

  // empty

  var es_object_toString = /*#__PURE__*/Object.freeze({
    __proto__: null
  });

  var ceil = Math.ceil;
  var floor = Math.floor;

  // `ToInteger` abstract operation
  // https://tc39.github.io/ecma262/#sec-tointeger
  var toInteger = function (argument) {
    return isNaN(argument = +argument) ? 0 : (argument > 0 ? floor : ceil)(argument);
  };

  // `RequireObjectCoercible` abstract operation
  // https://tc39.github.io/ecma262/#sec-requireobjectcoercible
  var requireObjectCoercible = function (it) {
    if (it == undefined) throw TypeError("Can't call method on " + it);
    return it;
  };

  // `String.prototype.{ codePointAt, at }` methods implementation
  var createMethod = function (CONVERT_TO_STRING) {
    return function ($this, pos) {
      var S = String(requireObjectCoercible($this));
      var position = toInteger(pos);
      var size = S.length;
      var first, second;
      if (position < 0 || position >= size) return CONVERT_TO_STRING ? '' : undefined;
      first = S.charCodeAt(position);
      return first < 0xD800 || first > 0xDBFF || position + 1 === size
        || (second = S.charCodeAt(position + 1)) < 0xDC00 || second > 0xDFFF
          ? CONVERT_TO_STRING ? S.charAt(position) : first
          : CONVERT_TO_STRING ? S.slice(position, position + 2) : (first - 0xD800 << 10) + (second - 0xDC00) + 0x10000;
    };
  };

  var stringMultibyte = {
    // `String.prototype.codePointAt` method
    // https://tc39.github.io/ecma262/#sec-string.prototype.codepointat
    codeAt: createMethod(false),
    // `String.prototype.at` method
    // https://github.com/mathiasbynens/String.prototype.at
    charAt: createMethod(true)
  };

  var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

  function createCommonjsModule(fn, module) {
  	return module = { exports: {} }, fn(module, module.exports), module.exports;
  }

  function getCjsExportFromNamespace (n) {
  	return n && n['default'] || n;
  }

  var check = function (it) {
    return it && it.Math == Math && it;
  };

  // https://github.com/zloirock/core-js/issues/86#issuecomment-115759028
  var global_1 =
    // eslint-disable-next-line no-undef
    check(typeof globalThis == 'object' && globalThis) ||
    check(typeof window == 'object' && window) ||
    check(typeof self == 'object' && self) ||
    check(typeof commonjsGlobal == 'object' && commonjsGlobal) ||
    // eslint-disable-next-line no-new-func
    Function('return this')();

  var fails = function (exec) {
    try {
      return !!exec();
    } catch (error) {
      return true;
    }
  };

  // Thank's IE8 for his funny defineProperty
  var descriptors = !fails(function () {
    return Object.defineProperty({}, 1, { get: function () { return 7; } })[1] != 7;
  });

  var isObject = function (it) {
    return typeof it === 'object' ? it !== null : typeof it === 'function';
  };

  var document$1 = global_1.document;
  // typeof document.createElement is 'object' in old IE
  var EXISTS = isObject(document$1) && isObject(document$1.createElement);

  var documentCreateElement = function (it) {
    return EXISTS ? document$1.createElement(it) : {};
  };

  // Thank's IE8 for his funny defineProperty
  var ie8DomDefine = !descriptors && !fails(function () {
    return Object.defineProperty(documentCreateElement('div'), 'a', {
      get: function () { return 7; }
    }).a != 7;
  });

  var anObject = function (it) {
    if (!isObject(it)) {
      throw TypeError(String(it) + ' is not an object');
    } return it;
  };

  // `ToPrimitive` abstract operation
  // https://tc39.github.io/ecma262/#sec-toprimitive
  // instead of the ES6 spec version, we didn't implement @@toPrimitive case
  // and the second argument - flag - preferred type is a string
  var toPrimitive = function (input, PREFERRED_STRING) {
    if (!isObject(input)) return input;
    var fn, val;
    if (PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
    if (typeof (fn = input.valueOf) == 'function' && !isObject(val = fn.call(input))) return val;
    if (!PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
    throw TypeError("Can't convert object to primitive value");
  };

  var nativeDefineProperty = Object.defineProperty;

  // `Object.defineProperty` method
  // https://tc39.github.io/ecma262/#sec-object.defineproperty
  var f = descriptors ? nativeDefineProperty : function defineProperty(O, P, Attributes) {
    anObject(O);
    P = toPrimitive(P, true);
    anObject(Attributes);
    if (ie8DomDefine) try {
      return nativeDefineProperty(O, P, Attributes);
    } catch (error) { /* empty */ }
    if ('get' in Attributes || 'set' in Attributes) throw TypeError('Accessors not supported');
    if ('value' in Attributes) O[P] = Attributes.value;
    return O;
  };

  var objectDefineProperty = {
  	f: f
  };

  var createPropertyDescriptor = function (bitmap, value) {
    return {
      enumerable: !(bitmap & 1),
      configurable: !(bitmap & 2),
      writable: !(bitmap & 4),
      value: value
    };
  };

  var createNonEnumerableProperty = descriptors ? function (object, key, value) {
    return objectDefineProperty.f(object, key, createPropertyDescriptor(1, value));
  } : function (object, key, value) {
    object[key] = value;
    return object;
  };

  var setGlobal = function (key, value) {
    try {
      createNonEnumerableProperty(global_1, key, value);
    } catch (error) {
      global_1[key] = value;
    } return value;
  };

  var SHARED = '__core-js_shared__';
  var store = global_1[SHARED] || setGlobal(SHARED, {});

  var sharedStore = store;

  var functionToString = Function.toString;

  // this helper broken in `3.4.1-3.4.4`, so we can't use `shared` helper
  if (typeof sharedStore.inspectSource != 'function') {
    sharedStore.inspectSource = function (it) {
      return functionToString.call(it);
    };
  }

  var inspectSource = sharedStore.inspectSource;

  var WeakMap = global_1.WeakMap;

  var nativeWeakMap = typeof WeakMap === 'function' && /native code/.test(inspectSource(WeakMap));

  var hasOwnProperty = {}.hasOwnProperty;

  var has = function (it, key) {
    return hasOwnProperty.call(it, key);
  };

  var isPure = true;

  var shared = createCommonjsModule(function (module) {
  (module.exports = function (key, value) {
    return sharedStore[key] || (sharedStore[key] = value !== undefined ? value : {});
  })('versions', []).push({
    version: '3.6.4',
    mode:  'pure' ,
    copyright: '© 2020 Denis Pushkarev (zloirock.ru)'
  });
  });

  var id = 0;
  var postfix = Math.random();

  var uid = function (key) {
    return 'Symbol(' + String(key === undefined ? '' : key) + ')_' + (++id + postfix).toString(36);
  };

  var keys = shared('keys');

  var sharedKey = function (key) {
    return keys[key] || (keys[key] = uid(key));
  };

  var hiddenKeys = {};

  var WeakMap$1 = global_1.WeakMap;
  var set, get, has$1;

  var enforce = function (it) {
    return has$1(it) ? get(it) : set(it, {});
  };

  var getterFor = function (TYPE) {
    return function (it) {
      var state;
      if (!isObject(it) || (state = get(it)).type !== TYPE) {
        throw TypeError('Incompatible receiver, ' + TYPE + ' required');
      } return state;
    };
  };

  if (nativeWeakMap) {
    var store$1 = new WeakMap$1();
    var wmget = store$1.get;
    var wmhas = store$1.has;
    var wmset = store$1.set;
    set = function (it, metadata) {
      wmset.call(store$1, it, metadata);
      return metadata;
    };
    get = function (it) {
      return wmget.call(store$1, it) || {};
    };
    has$1 = function (it) {
      return wmhas.call(store$1, it);
    };
  } else {
    var STATE = sharedKey('state');
    hiddenKeys[STATE] = true;
    set = function (it, metadata) {
      createNonEnumerableProperty(it, STATE, metadata);
      return metadata;
    };
    get = function (it) {
      return has(it, STATE) ? it[STATE] : {};
    };
    has$1 = function (it) {
      return has(it, STATE);
    };
  }

  var internalState = {
    set: set,
    get: get,
    has: has$1,
    enforce: enforce,
    getterFor: getterFor
  };

  var nativePropertyIsEnumerable = {}.propertyIsEnumerable;
  var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;

  // Nashorn ~ JDK8 bug
  var NASHORN_BUG = getOwnPropertyDescriptor && !nativePropertyIsEnumerable.call({ 1: 2 }, 1);

  // `Object.prototype.propertyIsEnumerable` method implementation
  // https://tc39.github.io/ecma262/#sec-object.prototype.propertyisenumerable
  var f$1 = NASHORN_BUG ? function propertyIsEnumerable(V) {
    var descriptor = getOwnPropertyDescriptor(this, V);
    return !!descriptor && descriptor.enumerable;
  } : nativePropertyIsEnumerable;

  var objectPropertyIsEnumerable = {
  	f: f$1
  };

  var toString = {}.toString;

  var classofRaw = function (it) {
    return toString.call(it).slice(8, -1);
  };

  var split = ''.split;

  // fallback for non-array-like ES3 and non-enumerable old V8 strings
  var indexedObject = fails(function () {
    // throws an error in rhino, see https://github.com/mozilla/rhino/issues/346
    // eslint-disable-next-line no-prototype-builtins
    return !Object('z').propertyIsEnumerable(0);
  }) ? function (it) {
    return classofRaw(it) == 'String' ? split.call(it, '') : Object(it);
  } : Object;

  // toObject with fallback for non-array-like ES3 strings



  var toIndexedObject = function (it) {
    return indexedObject(requireObjectCoercible(it));
  };

  var nativeGetOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;

  // `Object.getOwnPropertyDescriptor` method
  // https://tc39.github.io/ecma262/#sec-object.getownpropertydescriptor
  var f$2 = descriptors ? nativeGetOwnPropertyDescriptor : function getOwnPropertyDescriptor(O, P) {
    O = toIndexedObject(O);
    P = toPrimitive(P, true);
    if (ie8DomDefine) try {
      return nativeGetOwnPropertyDescriptor(O, P);
    } catch (error) { /* empty */ }
    if (has(O, P)) return createPropertyDescriptor(!objectPropertyIsEnumerable.f.call(O, P), O[P]);
  };

  var objectGetOwnPropertyDescriptor = {
  	f: f$2
  };

  var replacement = /#|\.prototype\./;

  var isForced = function (feature, detection) {
    var value = data[normalize(feature)];
    return value == POLYFILL ? true
      : value == NATIVE ? false
      : typeof detection == 'function' ? fails(detection)
      : !!detection;
  };

  var normalize = isForced.normalize = function (string) {
    return String(string).replace(replacement, '.').toLowerCase();
  };

  var data = isForced.data = {};
  var NATIVE = isForced.NATIVE = 'N';
  var POLYFILL = isForced.POLYFILL = 'P';

  var isForced_1 = isForced;

  var path = {};

  var aFunction = function (it) {
    if (typeof it != 'function') {
      throw TypeError(String(it) + ' is not a function');
    } return it;
  };

  // optional / simple context binding
  var functionBindContext = function (fn, that, length) {
    aFunction(fn);
    if (that === undefined) return fn;
    switch (length) {
      case 0: return function () {
        return fn.call(that);
      };
      case 1: return function (a) {
        return fn.call(that, a);
      };
      case 2: return function (a, b) {
        return fn.call(that, a, b);
      };
      case 3: return function (a, b, c) {
        return fn.call(that, a, b, c);
      };
    }
    return function (/* ...args */) {
      return fn.apply(that, arguments);
    };
  };

  var getOwnPropertyDescriptor$1 = objectGetOwnPropertyDescriptor.f;






  var wrapConstructor = function (NativeConstructor) {
    var Wrapper = function (a, b, c) {
      if (this instanceof NativeConstructor) {
        switch (arguments.length) {
          case 0: return new NativeConstructor();
          case 1: return new NativeConstructor(a);
          case 2: return new NativeConstructor(a, b);
        } return new NativeConstructor(a, b, c);
      } return NativeConstructor.apply(this, arguments);
    };
    Wrapper.prototype = NativeConstructor.prototype;
    return Wrapper;
  };

  /*
    options.target      - name of the target object
    options.global      - target is the global object
    options.stat        - export as static methods of target
    options.proto       - export as prototype methods of target
    options.real        - real prototype method for the `pure` version
    options.forced      - export even if the native feature is available
    options.bind        - bind methods to the target, required for the `pure` version
    options.wrap        - wrap constructors to preventing global pollution, required for the `pure` version
    options.unsafe      - use the simple assignment of property instead of delete + defineProperty
    options.sham        - add a flag to not completely full polyfills
    options.enumerable  - export as enumerable property
    options.noTargetGet - prevent calling a getter on target
  */
  var _export = function (options, source) {
    var TARGET = options.target;
    var GLOBAL = options.global;
    var STATIC = options.stat;
    var PROTO = options.proto;

    var nativeSource = GLOBAL ? global_1 : STATIC ? global_1[TARGET] : (global_1[TARGET] || {}).prototype;

    var target = GLOBAL ? path : path[TARGET] || (path[TARGET] = {});
    var targetPrototype = target.prototype;

    var FORCED, USE_NATIVE, VIRTUAL_PROTOTYPE;
    var key, sourceProperty, targetProperty, nativeProperty, resultProperty, descriptor;

    for (key in source) {
      FORCED = isForced_1(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced);
      // contains in native
      USE_NATIVE = !FORCED && nativeSource && has(nativeSource, key);

      targetProperty = target[key];

      if (USE_NATIVE) if (options.noTargetGet) {
        descriptor = getOwnPropertyDescriptor$1(nativeSource, key);
        nativeProperty = descriptor && descriptor.value;
      } else nativeProperty = nativeSource[key];

      // export native or implementation
      sourceProperty = (USE_NATIVE && nativeProperty) ? nativeProperty : source[key];

      if (USE_NATIVE && typeof targetProperty === typeof sourceProperty) continue;

      // bind timers to global for call from export context
      if (options.bind && USE_NATIVE) resultProperty = functionBindContext(sourceProperty, global_1);
      // wrap global constructors for prevent changs in this version
      else if (options.wrap && USE_NATIVE) resultProperty = wrapConstructor(sourceProperty);
      // make static versions for prototype methods
      else if (PROTO && typeof sourceProperty == 'function') resultProperty = functionBindContext(Function.call, sourceProperty);
      // default case
      else resultProperty = sourceProperty;

      // add a flag to not completely full polyfills
      if (options.sham || (sourceProperty && sourceProperty.sham) || (targetProperty && targetProperty.sham)) {
        createNonEnumerableProperty(resultProperty, 'sham', true);
      }

      target[key] = resultProperty;

      if (PROTO) {
        VIRTUAL_PROTOTYPE = TARGET + 'Prototype';
        if (!has(path, VIRTUAL_PROTOTYPE)) {
          createNonEnumerableProperty(path, VIRTUAL_PROTOTYPE, {});
        }
        // export virtual prototype methods
        path[VIRTUAL_PROTOTYPE][key] = sourceProperty;
        // export real prototype methods
        if (options.real && targetPrototype && !targetPrototype[key]) {
          createNonEnumerableProperty(targetPrototype, key, sourceProperty);
        }
      }
    }
  };

  // `ToObject` abstract operation
  // https://tc39.github.io/ecma262/#sec-toobject
  var toObject = function (argument) {
    return Object(requireObjectCoercible(argument));
  };

  var correctPrototypeGetter = !fails(function () {
    function F() { /* empty */ }
    F.prototype.constructor = null;
    return Object.getPrototypeOf(new F()) !== F.prototype;
  });

  var IE_PROTO = sharedKey('IE_PROTO');
  var ObjectPrototype = Object.prototype;

  // `Object.getPrototypeOf` method
  // https://tc39.github.io/ecma262/#sec-object.getprototypeof
  var objectGetPrototypeOf = correctPrototypeGetter ? Object.getPrototypeOf : function (O) {
    O = toObject(O);
    if (has(O, IE_PROTO)) return O[IE_PROTO];
    if (typeof O.constructor == 'function' && O instanceof O.constructor) {
      return O.constructor.prototype;
    } return O instanceof Object ? ObjectPrototype : null;
  };

  var nativeSymbol = !!Object.getOwnPropertySymbols && !fails(function () {
    // Chrome 38 Symbol has incorrect toString conversion
    // eslint-disable-next-line no-undef
    return !String(Symbol());
  });

  var useSymbolAsUid = nativeSymbol
    // eslint-disable-next-line no-undef
    && !Symbol.sham
    // eslint-disable-next-line no-undef
    && typeof Symbol.iterator == 'symbol';

  var WellKnownSymbolsStore = shared('wks');
  var Symbol$1 = global_1.Symbol;
  var createWellKnownSymbol = useSymbolAsUid ? Symbol$1 : Symbol$1 && Symbol$1.withoutSetter || uid;

  var wellKnownSymbol = function (name) {
    if (!has(WellKnownSymbolsStore, name)) {
      if (nativeSymbol && has(Symbol$1, name)) WellKnownSymbolsStore[name] = Symbol$1[name];
      else WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name);
    } return WellKnownSymbolsStore[name];
  };

  var ITERATOR = wellKnownSymbol('iterator');
  var BUGGY_SAFARI_ITERATORS = false;

  // `%IteratorPrototype%` object
  // https://tc39.github.io/ecma262/#sec-%iteratorprototype%-object
  var IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;

  if ([].keys) {
    arrayIterator = [].keys();
    // Safari 8 has buggy iterators w/o `next`
    if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;
    else {
      PrototypeOfArrayIteratorPrototype = objectGetPrototypeOf(objectGetPrototypeOf(arrayIterator));
      if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;
    }
  }

  if (IteratorPrototype == undefined) IteratorPrototype = {};

  var iteratorsCore = {
    IteratorPrototype: IteratorPrototype,
    BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS
  };

  var min = Math.min;

  // `ToLength` abstract operation
  // https://tc39.github.io/ecma262/#sec-tolength
  var toLength = function (argument) {
    return argument > 0 ? min(toInteger(argument), 0x1FFFFFFFFFFFFF) : 0; // 2 ** 53 - 1 == 9007199254740991
  };

  var max = Math.max;
  var min$1 = Math.min;

  // Helper for a popular repeating case of the spec:
  // Let integer be ? ToInteger(index).
  // If integer < 0, let result be max((length + integer), 0); else let result be min(integer, length).
  var toAbsoluteIndex = function (index, length) {
    var integer = toInteger(index);
    return integer < 0 ? max(integer + length, 0) : min$1(integer, length);
  };

  // `Array.prototype.{ indexOf, includes }` methods implementation
  var createMethod$1 = function (IS_INCLUDES) {
    return function ($this, el, fromIndex) {
      var O = toIndexedObject($this);
      var length = toLength(O.length);
      var index = toAbsoluteIndex(fromIndex, length);
      var value;
      // Array#includes uses SameValueZero equality algorithm
      // eslint-disable-next-line no-self-compare
      if (IS_INCLUDES && el != el) while (length > index) {
        value = O[index++];
        // eslint-disable-next-line no-self-compare
        if (value != value) return true;
      // Array#indexOf ignores holes, Array#includes - not
      } else for (;length > index; index++) {
        if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;
      } return !IS_INCLUDES && -1;
    };
  };

  var arrayIncludes = {
    // `Array.prototype.includes` method
    // https://tc39.github.io/ecma262/#sec-array.prototype.includes
    includes: createMethod$1(true),
    // `Array.prototype.indexOf` method
    // https://tc39.github.io/ecma262/#sec-array.prototype.indexof
    indexOf: createMethod$1(false)
  };

  var indexOf = arrayIncludes.indexOf;


  var objectKeysInternal = function (object, names) {
    var O = toIndexedObject(object);
    var i = 0;
    var result = [];
    var key;
    for (key in O) !has(hiddenKeys, key) && has(O, key) && result.push(key);
    // Don't enum bug & hidden keys
    while (names.length > i) if (has(O, key = names[i++])) {
      ~indexOf(result, key) || result.push(key);
    }
    return result;
  };

  // IE8- don't enum bug keys
  var enumBugKeys = [
    'constructor',
    'hasOwnProperty',
    'isPrototypeOf',
    'propertyIsEnumerable',
    'toLocaleString',
    'toString',
    'valueOf'
  ];

  // `Object.keys` method
  // https://tc39.github.io/ecma262/#sec-object.keys
  var objectKeys = Object.keys || function keys(O) {
    return objectKeysInternal(O, enumBugKeys);
  };

  // `Object.defineProperties` method
  // https://tc39.github.io/ecma262/#sec-object.defineproperties
  var objectDefineProperties = descriptors ? Object.defineProperties : function defineProperties(O, Properties) {
    anObject(O);
    var keys = objectKeys(Properties);
    var length = keys.length;
    var index = 0;
    var key;
    while (length > index) objectDefineProperty.f(O, key = keys[index++], Properties[key]);
    return O;
  };

  var aFunction$1 = function (variable) {
    return typeof variable == 'function' ? variable : undefined;
  };

  var getBuiltIn = function (namespace, method) {
    return arguments.length < 2 ? aFunction$1(path[namespace]) || aFunction$1(global_1[namespace])
      : path[namespace] && path[namespace][method] || global_1[namespace] && global_1[namespace][method];
  };

  var html = getBuiltIn('document', 'documentElement');

  var GT = '>';
  var LT = '<';
  var PROTOTYPE = 'prototype';
  var SCRIPT = 'script';
  var IE_PROTO$1 = sharedKey('IE_PROTO');

  var EmptyConstructor = function () { /* empty */ };

  var scriptTag = function (content) {
    return LT + SCRIPT + GT + content + LT + '/' + SCRIPT + GT;
  };

  // Create object with fake `null` prototype: use ActiveX Object with cleared prototype
  var NullProtoObjectViaActiveX = function (activeXDocument) {
    activeXDocument.write(scriptTag(''));
    activeXDocument.close();
    var temp = activeXDocument.parentWindow.Object;
    activeXDocument = null; // avoid memory leak
    return temp;
  };

  // Create object with fake `null` prototype: use iframe Object with cleared prototype
  var NullProtoObjectViaIFrame = function () {
    // Thrash, waste and sodomy: IE GC bug
    var iframe = documentCreateElement('iframe');
    var JS = 'java' + SCRIPT + ':';
    var iframeDocument;
    iframe.style.display = 'none';
    html.appendChild(iframe);
    // https://github.com/zloirock/core-js/issues/475
    iframe.src = String(JS);
    iframeDocument = iframe.contentWindow.document;
    iframeDocument.open();
    iframeDocument.write(scriptTag('document.F=Object'));
    iframeDocument.close();
    return iframeDocument.F;
  };

  // Check for document.domain and active x support
  // No need to use active x approach when document.domain is not set
  // see https://github.com/es-shims/es5-shim/issues/150
  // variation of https://github.com/kitcambridge/es5-shim/commit/4f738ac066346
  // avoid IE GC bug
  var activeXDocument;
  var NullProtoObject = function () {
    try {
      /* global ActiveXObject */
      activeXDocument = document.domain && new ActiveXObject('htmlfile');
    } catch (error) { /* ignore */ }
    NullProtoObject = activeXDocument ? NullProtoObjectViaActiveX(activeXDocument) : NullProtoObjectViaIFrame();
    var length = enumBugKeys.length;
    while (length--) delete NullProtoObject[PROTOTYPE][enumBugKeys[length]];
    return NullProtoObject();
  };

  hiddenKeys[IE_PROTO$1] = true;

  // `Object.create` method
  // https://tc39.github.io/ecma262/#sec-object.create
  var objectCreate = Object.create || function create(O, Properties) {
    var result;
    if (O !== null) {
      EmptyConstructor[PROTOTYPE] = anObject(O);
      result = new EmptyConstructor();
      EmptyConstructor[PROTOTYPE] = null;
      // add "__proto__" for Object.getPrototypeOf polyfill
      result[IE_PROTO$1] = O;
    } else result = NullProtoObject();
    return Properties === undefined ? result : objectDefineProperties(result, Properties);
  };

  var TO_STRING_TAG = wellKnownSymbol('toStringTag');
  var test = {};

  test[TO_STRING_TAG] = 'z';

  var toStringTagSupport = String(test) === '[object z]';

  var TO_STRING_TAG$1 = wellKnownSymbol('toStringTag');
  // ES3 wrong here
  var CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) == 'Arguments';

  // fallback for IE11 Script Access Denied error
  var tryGet = function (it, key) {
    try {
      return it[key];
    } catch (error) { /* empty */ }
  };

  // getting tag from ES6+ `Object.prototype.toString`
  var classof = toStringTagSupport ? classofRaw : function (it) {
    var O, tag, result;
    return it === undefined ? 'Undefined' : it === null ? 'Null'
      // @@toStringTag case
      : typeof (tag = tryGet(O = Object(it), TO_STRING_TAG$1)) == 'string' ? tag
      // builtinTag case
      : CORRECT_ARGUMENTS ? classofRaw(O)
      // ES3 arguments fallback
      : (result = classofRaw(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : result;
  };

  // `Object.prototype.toString` method implementation
  // https://tc39.github.io/ecma262/#sec-object.prototype.tostring
  var objectToString = toStringTagSupport ? {}.toString : function toString() {
    return '[object ' + classof(this) + ']';
  };

  var defineProperty = objectDefineProperty.f;





  var TO_STRING_TAG$2 = wellKnownSymbol('toStringTag');

  var setToStringTag = function (it, TAG, STATIC, SET_METHOD) {
    if (it) {
      var target = STATIC ? it : it.prototype;
      if (!has(target, TO_STRING_TAG$2)) {
        defineProperty(target, TO_STRING_TAG$2, { configurable: true, value: TAG });
      }
      if (SET_METHOD && !toStringTagSupport) {
        createNonEnumerableProperty(target, 'toString', objectToString);
      }
    }
  };

  var iterators = {};

  var IteratorPrototype$1 = iteratorsCore.IteratorPrototype;





  var returnThis = function () { return this; };

  var createIteratorConstructor = function (IteratorConstructor, NAME, next) {
    var TO_STRING_TAG = NAME + ' Iterator';
    IteratorConstructor.prototype = objectCreate(IteratorPrototype$1, { next: createPropertyDescriptor(1, next) });
    setToStringTag(IteratorConstructor, TO_STRING_TAG, false, true);
    iterators[TO_STRING_TAG] = returnThis;
    return IteratorConstructor;
  };

  var aPossiblePrototype = function (it) {
    if (!isObject(it) && it !== null) {
      throw TypeError("Can't set " + String(it) + ' as a prototype');
    } return it;
  };

  // `Object.setPrototypeOf` method
  // https://tc39.github.io/ecma262/#sec-object.setprototypeof
  // Works with __proto__ only. Old v8 can't work with null proto objects.
  /* eslint-disable no-proto */
  var objectSetPrototypeOf = Object.setPrototypeOf || ('__proto__' in {} ? function () {
    var CORRECT_SETTER = false;
    var test = {};
    var setter;
    try {
      setter = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__').set;
      setter.call(test, []);
      CORRECT_SETTER = test instanceof Array;
    } catch (error) { /* empty */ }
    return function setPrototypeOf(O, proto) {
      anObject(O);
      aPossiblePrototype(proto);
      if (CORRECT_SETTER) setter.call(O, proto);
      else O.__proto__ = proto;
      return O;
    };
  }() : undefined);

  var redefine = function (target, key, value, options) {
    if (options && options.enumerable) target[key] = value;
    else createNonEnumerableProperty(target, key, value);
  };

  var IteratorPrototype$2 = iteratorsCore.IteratorPrototype;
  var BUGGY_SAFARI_ITERATORS$1 = iteratorsCore.BUGGY_SAFARI_ITERATORS;
  var ITERATOR$1 = wellKnownSymbol('iterator');
  var KEYS = 'keys';
  var VALUES = 'values';
  var ENTRIES = 'entries';

  var returnThis$1 = function () { return this; };

  var defineIterator = function (Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {
    createIteratorConstructor(IteratorConstructor, NAME, next);

    var getIterationMethod = function (KIND) {
      if (KIND === DEFAULT && defaultIterator) return defaultIterator;
      if (!BUGGY_SAFARI_ITERATORS$1 && KIND in IterablePrototype) return IterablePrototype[KIND];
      switch (KIND) {
        case KEYS: return function keys() { return new IteratorConstructor(this, KIND); };
        case VALUES: return function values() { return new IteratorConstructor(this, KIND); };
        case ENTRIES: return function entries() { return new IteratorConstructor(this, KIND); };
      } return function () { return new IteratorConstructor(this); };
    };

    var TO_STRING_TAG = NAME + ' Iterator';
    var INCORRECT_VALUES_NAME = false;
    var IterablePrototype = Iterable.prototype;
    var nativeIterator = IterablePrototype[ITERATOR$1]
      || IterablePrototype['@@iterator']
      || DEFAULT && IterablePrototype[DEFAULT];
    var defaultIterator = !BUGGY_SAFARI_ITERATORS$1 && nativeIterator || getIterationMethod(DEFAULT);
    var anyNativeIterator = NAME == 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;
    var CurrentIteratorPrototype, methods, KEY;

    // fix native
    if (anyNativeIterator) {
      CurrentIteratorPrototype = objectGetPrototypeOf(anyNativeIterator.call(new Iterable()));
      if (IteratorPrototype$2 !== Object.prototype && CurrentIteratorPrototype.next) {
        // Set @@toStringTag to native iterators
        setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true, true);
        iterators[TO_STRING_TAG] = returnThis$1;
      }
    }

    // fix Array#{values, @@iterator}.name in V8 / FF
    if (DEFAULT == VALUES && nativeIterator && nativeIterator.name !== VALUES) {
      INCORRECT_VALUES_NAME = true;
      defaultIterator = function values() { return nativeIterator.call(this); };
    }

    // define iterator
    if (( FORCED) && IterablePrototype[ITERATOR$1] !== defaultIterator) {
      createNonEnumerableProperty(IterablePrototype, ITERATOR$1, defaultIterator);
    }
    iterators[NAME] = defaultIterator;

    // export additional methods
    if (DEFAULT) {
      methods = {
        values: getIterationMethod(VALUES),
        keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),
        entries: getIterationMethod(ENTRIES)
      };
      if (FORCED) for (KEY in methods) {
        if (BUGGY_SAFARI_ITERATORS$1 || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {
          redefine(IterablePrototype, KEY, methods[KEY]);
        }
      } else _export({ target: NAME, proto: true, forced: BUGGY_SAFARI_ITERATORS$1 || INCORRECT_VALUES_NAME }, methods);
    }

    return methods;
  };

  var charAt = stringMultibyte.charAt;



  var STRING_ITERATOR = 'String Iterator';
  var setInternalState = internalState.set;
  var getInternalState = internalState.getterFor(STRING_ITERATOR);

  // `String.prototype[@@iterator]` method
  // https://tc39.github.io/ecma262/#sec-string.prototype-@@iterator
  defineIterator(String, 'String', function (iterated) {
    setInternalState(this, {
      type: STRING_ITERATOR,
      string: String(iterated),
      index: 0
    });
  // `%StringIteratorPrototype%.next` method
  // https://tc39.github.io/ecma262/#sec-%stringiteratorprototype%.next
  }, function next() {
    var state = getInternalState(this);
    var string = state.string;
    var index = state.index;
    var point;
    if (index >= string.length) return { value: undefined, done: true };
    point = charAt(string, index);
    state.index += point.length;
    return { value: point, done: false };
  });

  var ARRAY_ITERATOR = 'Array Iterator';
  var setInternalState$1 = internalState.set;
  var getInternalState$1 = internalState.getterFor(ARRAY_ITERATOR);

  // `Array.prototype.entries` method
  // https://tc39.github.io/ecma262/#sec-array.prototype.entries
  // `Array.prototype.keys` method
  // https://tc39.github.io/ecma262/#sec-array.prototype.keys
  // `Array.prototype.values` method
  // https://tc39.github.io/ecma262/#sec-array.prototype.values
  // `Array.prototype[@@iterator]` method
  // https://tc39.github.io/ecma262/#sec-array.prototype-@@iterator
  // `CreateArrayIterator` internal method
  // https://tc39.github.io/ecma262/#sec-createarrayiterator
  var es_array_iterator = defineIterator(Array, 'Array', function (iterated, kind) {
    setInternalState$1(this, {
      type: ARRAY_ITERATOR,
      target: toIndexedObject(iterated), // target
      index: 0,                          // next index
      kind: kind                         // kind
    });
  // `%ArrayIteratorPrototype%.next` method
  // https://tc39.github.io/ecma262/#sec-%arrayiteratorprototype%.next
  }, function () {
    var state = getInternalState$1(this);
    var target = state.target;
    var kind = state.kind;
    var index = state.index++;
    if (!target || index >= target.length) {
      state.target = undefined;
      return { value: undefined, done: true };
    }
    if (kind == 'keys') return { value: index, done: false };
    if (kind == 'values') return { value: target[index], done: false };
    return { value: [index, target[index]], done: false };
  }, 'values');

  // argumentsList[@@iterator] is %ArrayProto_values%
  // https://tc39.github.io/ecma262/#sec-createunmappedargumentsobject
  // https://tc39.github.io/ecma262/#sec-createmappedargumentsobject
  iterators.Arguments = iterators.Array;

  // iterable DOM collections
  // flag - `iterable` interface - 'entries', 'keys', 'values', 'forEach' methods
  var domIterables = {
    CSSRuleList: 0,
    CSSStyleDeclaration: 0,
    CSSValueList: 0,
    ClientRectList: 0,
    DOMRectList: 0,
    DOMStringList: 0,
    DOMTokenList: 1,
    DataTransferItemList: 0,
    FileList: 0,
    HTMLAllCollection: 0,
    HTMLCollection: 0,
    HTMLFormElement: 0,
    HTMLSelectElement: 0,
    MediaList: 0,
    MimeTypeArray: 0,
    NamedNodeMap: 0,
    NodeList: 1,
    PaintRequestList: 0,
    Plugin: 0,
    PluginArray: 0,
    SVGLengthList: 0,
    SVGNumberList: 0,
    SVGPathSegList: 0,
    SVGPointList: 0,
    SVGStringList: 0,
    SVGTransformList: 0,
    SourceBufferList: 0,
    StyleSheetList: 0,
    TextTrackCueList: 0,
    TextTrackList: 0,
    TouchList: 0
  };

  var TO_STRING_TAG$3 = wellKnownSymbol('toStringTag');

  for (var COLLECTION_NAME in domIterables) {
    var Collection = global_1[COLLECTION_NAME];
    var CollectionPrototype = Collection && Collection.prototype;
    if (CollectionPrototype && classof(CollectionPrototype) !== TO_STRING_TAG$3) {
      createNonEnumerableProperty(CollectionPrototype, TO_STRING_TAG$3, COLLECTION_NAME);
    }
    iterators[COLLECTION_NAME] = iterators.Array;
  }

  var nativePromiseConstructor = global_1.Promise;

  var redefineAll = function (target, src, options) {
    for (var key in src) {
      if (options && options.unsafe && target[key]) target[key] = src[key];
      else redefine(target, key, src[key], options);
    } return target;
  };

  var SPECIES = wellKnownSymbol('species');

  var setSpecies = function (CONSTRUCTOR_NAME) {
    var Constructor = getBuiltIn(CONSTRUCTOR_NAME);
    var defineProperty = objectDefineProperty.f;

    if (descriptors && Constructor && !Constructor[SPECIES]) {
      defineProperty(Constructor, SPECIES, {
        configurable: true,
        get: function () { return this; }
      });
    }
  };

  var anInstance = function (it, Constructor, name) {
    if (!(it instanceof Constructor)) {
      throw TypeError('Incorrect ' + (name ? name + ' ' : '') + 'invocation');
    } return it;
  };

  var ITERATOR$2 = wellKnownSymbol('iterator');
  var ArrayPrototype = Array.prototype;

  // check on default Array iterator
  var isArrayIteratorMethod = function (it) {
    return it !== undefined && (iterators.Array === it || ArrayPrototype[ITERATOR$2] === it);
  };

  var ITERATOR$3 = wellKnownSymbol('iterator');

  var getIteratorMethod = function (it) {
    if (it != undefined) return it[ITERATOR$3]
      || it['@@iterator']
      || iterators[classof(it)];
  };

  // call something on iterator step with safe closing on error
  var callWithSafeIterationClosing = function (iterator, fn, value, ENTRIES) {
    try {
      return ENTRIES ? fn(anObject(value)[0], value[1]) : fn(value);
    // 7.4.6 IteratorClose(iterator, completion)
    } catch (error) {
      var returnMethod = iterator['return'];
      if (returnMethod !== undefined) anObject(returnMethod.call(iterator));
      throw error;
    }
  };

  var iterate_1 = createCommonjsModule(function (module) {
  var Result = function (stopped, result) {
    this.stopped = stopped;
    this.result = result;
  };

  var iterate = module.exports = function (iterable, fn, that, AS_ENTRIES, IS_ITERATOR) {
    var boundFunction = functionBindContext(fn, that, AS_ENTRIES ? 2 : 1);
    var iterator, iterFn, index, length, result, next, step;

    if (IS_ITERATOR) {
      iterator = iterable;
    } else {
      iterFn = getIteratorMethod(iterable);
      if (typeof iterFn != 'function') throw TypeError('Target is not iterable');
      // optimisation for array iterators
      if (isArrayIteratorMethod(iterFn)) {
        for (index = 0, length = toLength(iterable.length); length > index; index++) {
          result = AS_ENTRIES
            ? boundFunction(anObject(step = iterable[index])[0], step[1])
            : boundFunction(iterable[index]);
          if (result && result instanceof Result) return result;
        } return new Result(false);
      }
      iterator = iterFn.call(iterable);
    }

    next = iterator.next;
    while (!(step = next.call(iterator)).done) {
      result = callWithSafeIterationClosing(iterator, boundFunction, step.value, AS_ENTRIES);
      if (typeof result == 'object' && result && result instanceof Result) return result;
    } return new Result(false);
  };

  iterate.stop = function (result) {
    return new Result(true, result);
  };
  });

  var ITERATOR$4 = wellKnownSymbol('iterator');
  var SAFE_CLOSING = false;

  try {
    var called = 0;
    var iteratorWithReturn = {
      next: function () {
        return { done: !!called++ };
      },
      'return': function () {
        SAFE_CLOSING = true;
      }
    };
    iteratorWithReturn[ITERATOR$4] = function () {
      return this;
    };
    // eslint-disable-next-line no-throw-literal
    Array.from(iteratorWithReturn, function () { throw 2; });
  } catch (error) { /* empty */ }

  var checkCorrectnessOfIteration = function (exec, SKIP_CLOSING) {
    if (!SKIP_CLOSING && !SAFE_CLOSING) return false;
    var ITERATION_SUPPORT = false;
    try {
      var object = {};
      object[ITERATOR$4] = function () {
        return {
          next: function () {
            return { done: ITERATION_SUPPORT = true };
          }
        };
      };
      exec(object);
    } catch (error) { /* empty */ }
    return ITERATION_SUPPORT;
  };

  var SPECIES$1 = wellKnownSymbol('species');

  // `SpeciesConstructor` abstract operation
  // https://tc39.github.io/ecma262/#sec-speciesconstructor
  var speciesConstructor = function (O, defaultConstructor) {
    var C = anObject(O).constructor;
    var S;
    return C === undefined || (S = anObject(C)[SPECIES$1]) == undefined ? defaultConstructor : aFunction(S);
  };

  var engineUserAgent = getBuiltIn('navigator', 'userAgent') || '';

  var engineIsIos = /(iphone|ipod|ipad).*applewebkit/i.test(engineUserAgent);

  var location = global_1.location;
  var set$1 = global_1.setImmediate;
  var clear = global_1.clearImmediate;
  var process = global_1.process;
  var MessageChannel = global_1.MessageChannel;
  var Dispatch = global_1.Dispatch;
  var counter = 0;
  var queue = {};
  var ONREADYSTATECHANGE = 'onreadystatechange';
  var defer, channel, port;

  var run = function (id) {
    // eslint-disable-next-line no-prototype-builtins
    if (queue.hasOwnProperty(id)) {
      var fn = queue[id];
      delete queue[id];
      fn();
    }
  };

  var runner = function (id) {
    return function () {
      run(id);
    };
  };

  var listener = function (event) {
    run(event.data);
  };

  var post = function (id) {
    // old engines have not location.origin
    global_1.postMessage(id + '', location.protocol + '//' + location.host);
  };

  // Node.js 0.9+ & IE10+ has setImmediate, otherwise:
  if (!set$1 || !clear) {
    set$1 = function setImmediate(fn) {
      var args = [];
      var i = 1;
      while (arguments.length > i) args.push(arguments[i++]);
      queue[++counter] = function () {
        // eslint-disable-next-line no-new-func
        (typeof fn == 'function' ? fn : Function(fn)).apply(undefined, args);
      };
      defer(counter);
      return counter;
    };
    clear = function clearImmediate(id) {
      delete queue[id];
    };
    // Node.js 0.8-
    if (classofRaw(process) == 'process') {
      defer = function (id) {
        process.nextTick(runner(id));
      };
    // Sphere (JS game engine) Dispatch API
    } else if (Dispatch && Dispatch.now) {
      defer = function (id) {
        Dispatch.now(runner(id));
      };
    // Browsers with MessageChannel, includes WebWorkers
    // except iOS - https://github.com/zloirock/core-js/issues/624
    } else if (MessageChannel && !engineIsIos) {
      channel = new MessageChannel();
      port = channel.port2;
      channel.port1.onmessage = listener;
      defer = functionBindContext(port.postMessage, port, 1);
    // Browsers with postMessage, skip WebWorkers
    // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
    } else if (
      global_1.addEventListener &&
      typeof postMessage == 'function' &&
      !global_1.importScripts &&
      !fails(post) &&
      location.protocol !== 'file:'
    ) {
      defer = post;
      global_1.addEventListener('message', listener, false);
    // IE8-
    } else if (ONREADYSTATECHANGE in documentCreateElement('script')) {
      defer = function (id) {
        html.appendChild(documentCreateElement('script'))[ONREADYSTATECHANGE] = function () {
          html.removeChild(this);
          run(id);
        };
      };
    // Rest old browsers
    } else {
      defer = function (id) {
        setTimeout(runner(id), 0);
      };
    }
  }

  var task = {
    set: set$1,
    clear: clear
  };

  var getOwnPropertyDescriptor$2 = objectGetOwnPropertyDescriptor.f;

  var macrotask = task.set;


  var MutationObserver = global_1.MutationObserver || global_1.WebKitMutationObserver;
  var process$1 = global_1.process;
  var Promise$1 = global_1.Promise;
  var IS_NODE = classofRaw(process$1) == 'process';
  // Node.js 11 shows ExperimentalWarning on getting `queueMicrotask`
  var queueMicrotaskDescriptor = getOwnPropertyDescriptor$2(global_1, 'queueMicrotask');
  var queueMicrotask = queueMicrotaskDescriptor && queueMicrotaskDescriptor.value;

  var flush, head, last, notify, toggle, node, promise, then;

  // modern engines have queueMicrotask method
  if (!queueMicrotask) {
    flush = function () {
      var parent, fn;
      if (IS_NODE && (parent = process$1.domain)) parent.exit();
      while (head) {
        fn = head.fn;
        head = head.next;
        try {
          fn();
        } catch (error) {
          if (head) notify();
          else last = undefined;
          throw error;
        }
      } last = undefined;
      if (parent) parent.enter();
    };

    // Node.js
    if (IS_NODE) {
      notify = function () {
        process$1.nextTick(flush);
      };
    // browsers with MutationObserver, except iOS - https://github.com/zloirock/core-js/issues/339
    } else if (MutationObserver && !engineIsIos) {
      toggle = true;
      node = document.createTextNode('');
      new MutationObserver(flush).observe(node, { characterData: true });
      notify = function () {
        node.data = toggle = !toggle;
      };
    // environments with maybe non-completely correct, but existent Promise
    } else if (Promise$1 && Promise$1.resolve) {
      // Promise.resolve without an argument throws an error in LG WebOS 2
      promise = Promise$1.resolve(undefined);
      then = promise.then;
      notify = function () {
        then.call(promise, flush);
      };
    // for other environments - macrotask based on:
    // - setImmediate
    // - MessageChannel
    // - window.postMessag
    // - onreadystatechange
    // - setTimeout
    } else {
      notify = function () {
        // strange IE + webpack dev server bug - use .call(global)
        macrotask.call(global_1, flush);
      };
    }
  }

  var microtask = queueMicrotask || function (fn) {
    var task = { fn: fn, next: undefined };
    if (last) last.next = task;
    if (!head) {
      head = task;
      notify();
    } last = task;
  };

  var PromiseCapability = function (C) {
    var resolve, reject;
    this.promise = new C(function ($$resolve, $$reject) {
      if (resolve !== undefined || reject !== undefined) throw TypeError('Bad Promise constructor');
      resolve = $$resolve;
      reject = $$reject;
    });
    this.resolve = aFunction(resolve);
    this.reject = aFunction(reject);
  };

  // 25.4.1.5 NewPromiseCapability(C)
  var f$3 = function (C) {
    return new PromiseCapability(C);
  };

  var newPromiseCapability = {
  	f: f$3
  };

  var promiseResolve = function (C, x) {
    anObject(C);
    if (isObject(x) && x.constructor === C) return x;
    var promiseCapability = newPromiseCapability.f(C);
    var resolve = promiseCapability.resolve;
    resolve(x);
    return promiseCapability.promise;
  };

  var hostReportErrors = function (a, b) {
    var console = global_1.console;
    if (console && console.error) {
      arguments.length === 1 ? console.error(a) : console.error(a, b);
    }
  };

  var perform = function (exec) {
    try {
      return { error: false, value: exec() };
    } catch (error) {
      return { error: true, value: error };
    }
  };

  var process$2 = global_1.process;
  var versions = process$2 && process$2.versions;
  var v8 = versions && versions.v8;
  var match, version;

  if (v8) {
    match = v8.split('.');
    version = match[0] + match[1];
  } else if (engineUserAgent) {
    match = engineUserAgent.match(/Edge\/(\d+)/);
    if (!match || match[1] >= 74) {
      match = engineUserAgent.match(/Chrome\/(\d+)/);
      if (match) version = match[1];
    }
  }

  var engineV8Version = version && +version;

  var task$1 = task.set;










  var SPECIES$2 = wellKnownSymbol('species');
  var PROMISE = 'Promise';
  var getInternalState$2 = internalState.get;
  var setInternalState$2 = internalState.set;
  var getInternalPromiseState = internalState.getterFor(PROMISE);
  var PromiseConstructor = nativePromiseConstructor;
  var TypeError$1 = global_1.TypeError;
  var document$2 = global_1.document;
  var process$3 = global_1.process;
  var $fetch = getBuiltIn('fetch');
  var newPromiseCapability$1 = newPromiseCapability.f;
  var newGenericPromiseCapability = newPromiseCapability$1;
  var IS_NODE$1 = classofRaw(process$3) == 'process';
  var DISPATCH_EVENT = !!(document$2 && document$2.createEvent && global_1.dispatchEvent);
  var UNHANDLED_REJECTION = 'unhandledrejection';
  var REJECTION_HANDLED = 'rejectionhandled';
  var PENDING = 0;
  var FULFILLED = 1;
  var REJECTED = 2;
  var HANDLED = 1;
  var UNHANDLED = 2;
  var Internal, OwnPromiseCapability, PromiseWrapper;

  var FORCED = isForced_1(PROMISE, function () {
    var GLOBAL_CORE_JS_PROMISE = inspectSource(PromiseConstructor) !== String(PromiseConstructor);
    if (!GLOBAL_CORE_JS_PROMISE) {
      // V8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables
      // https://bugs.chromium.org/p/chromium/issues/detail?id=830565
      // We can't detect it synchronously, so just check versions
      if (engineV8Version === 66) return true;
      // Unhandled rejections tracking support, NodeJS Promise without it fails @@species test
      if (!IS_NODE$1 && typeof PromiseRejectionEvent != 'function') return true;
    }
    // We need Promise#finally in the pure version for preventing prototype pollution
    if ( !PromiseConstructor.prototype['finally']) return true;
    // We can't use @@species feature detection in V8 since it causes
    // deoptimization and performance degradation
    // https://github.com/zloirock/core-js/issues/679
    if (engineV8Version >= 51 && /native code/.test(PromiseConstructor)) return false;
    // Detect correctness of subclassing with @@species support
    var promise = PromiseConstructor.resolve(1);
    var FakePromise = function (exec) {
      exec(function () { /* empty */ }, function () { /* empty */ });
    };
    var constructor = promise.constructor = {};
    constructor[SPECIES$2] = FakePromise;
    return !(promise.then(function () { /* empty */ }) instanceof FakePromise);
  });

  var INCORRECT_ITERATION = FORCED || !checkCorrectnessOfIteration(function (iterable) {
    PromiseConstructor.all(iterable)['catch'](function () { /* empty */ });
  });

  // helpers
  var isThenable = function (it) {
    var then;
    return isObject(it) && typeof (then = it.then) == 'function' ? then : false;
  };

  var notify$1 = function (promise, state, isReject) {
    if (state.notified) return;
    state.notified = true;
    var chain = state.reactions;
    microtask(function () {
      var value = state.value;
      var ok = state.state == FULFILLED;
      var index = 0;
      // variable length - can't use forEach
      while (chain.length > index) {
        var reaction = chain[index++];
        var handler = ok ? reaction.ok : reaction.fail;
        var resolve = reaction.resolve;
        var reject = reaction.reject;
        var domain = reaction.domain;
        var result, then, exited;
        try {
          if (handler) {
            if (!ok) {
              if (state.rejection === UNHANDLED) onHandleUnhandled(promise, state);
              state.rejection = HANDLED;
            }
            if (handler === true) result = value;
            else {
              if (domain) domain.enter();
              result = handler(value); // can throw
              if (domain) {
                domain.exit();
                exited = true;
              }
            }
            if (result === reaction.promise) {
              reject(TypeError$1('Promise-chain cycle'));
            } else if (then = isThenable(result)) {
              then.call(result, resolve, reject);
            } else resolve(result);
          } else reject(value);
        } catch (error) {
          if (domain && !exited) domain.exit();
          reject(error);
        }
      }
      state.reactions = [];
      state.notified = false;
      if (isReject && !state.rejection) onUnhandled(promise, state);
    });
  };

  var dispatchEvent = function (name, promise, reason) {
    var event, handler;
    if (DISPATCH_EVENT) {
      event = document$2.createEvent('Event');
      event.promise = promise;
      event.reason = reason;
      event.initEvent(name, false, true);
      global_1.dispatchEvent(event);
    } else event = { promise: promise, reason: reason };
    if (handler = global_1['on' + name]) handler(event);
    else if (name === UNHANDLED_REJECTION) hostReportErrors('Unhandled promise rejection', reason);
  };

  var onUnhandled = function (promise, state) {
    task$1.call(global_1, function () {
      var value = state.value;
      var IS_UNHANDLED = isUnhandled(state);
      var result;
      if (IS_UNHANDLED) {
        result = perform(function () {
          if (IS_NODE$1) {
            process$3.emit('unhandledRejection', value, promise);
          } else dispatchEvent(UNHANDLED_REJECTION, promise, value);
        });
        // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should
        state.rejection = IS_NODE$1 || isUnhandled(state) ? UNHANDLED : HANDLED;
        if (result.error) throw result.value;
      }
    });
  };

  var isUnhandled = function (state) {
    return state.rejection !== HANDLED && !state.parent;
  };

  var onHandleUnhandled = function (promise, state) {
    task$1.call(global_1, function () {
      if (IS_NODE$1) {
        process$3.emit('rejectionHandled', promise);
      } else dispatchEvent(REJECTION_HANDLED, promise, state.value);
    });
  };

  var bind = function (fn, promise, state, unwrap) {
    return function (value) {
      fn(promise, state, value, unwrap);
    };
  };

  var internalReject = function (promise, state, value, unwrap) {
    if (state.done) return;
    state.done = true;
    if (unwrap) state = unwrap;
    state.value = value;
    state.state = REJECTED;
    notify$1(promise, state, true);
  };

  var internalResolve = function (promise, state, value, unwrap) {
    if (state.done) return;
    state.done = true;
    if (unwrap) state = unwrap;
    try {
      if (promise === value) throw TypeError$1("Promise can't be resolved itself");
      var then = isThenable(value);
      if (then) {
        microtask(function () {
          var wrapper = { done: false };
          try {
            then.call(value,
              bind(internalResolve, promise, wrapper, state),
              bind(internalReject, promise, wrapper, state)
            );
          } catch (error) {
            internalReject(promise, wrapper, error, state);
          }
        });
      } else {
        state.value = value;
        state.state = FULFILLED;
        notify$1(promise, state, false);
      }
    } catch (error) {
      internalReject(promise, { done: false }, error, state);
    }
  };

  // constructor polyfill
  if (FORCED) {
    // 25.4.3.1 Promise(executor)
    PromiseConstructor = function Promise(executor) {
      anInstance(this, PromiseConstructor, PROMISE);
      aFunction(executor);
      Internal.call(this);
      var state = getInternalState$2(this);
      try {
        executor(bind(internalResolve, this, state), bind(internalReject, this, state));
      } catch (error) {
        internalReject(this, state, error);
      }
    };
    // eslint-disable-next-line no-unused-vars
    Internal = function Promise(executor) {
      setInternalState$2(this, {
        type: PROMISE,
        done: false,
        notified: false,
        parent: false,
        reactions: [],
        rejection: false,
        state: PENDING,
        value: undefined
      });
    };
    Internal.prototype = redefineAll(PromiseConstructor.prototype, {
      // `Promise.prototype.then` method
      // https://tc39.github.io/ecma262/#sec-promise.prototype.then
      then: function then(onFulfilled, onRejected) {
        var state = getInternalPromiseState(this);
        var reaction = newPromiseCapability$1(speciesConstructor(this, PromiseConstructor));
        reaction.ok = typeof onFulfilled == 'function' ? onFulfilled : true;
        reaction.fail = typeof onRejected == 'function' && onRejected;
        reaction.domain = IS_NODE$1 ? process$3.domain : undefined;
        state.parent = true;
        state.reactions.push(reaction);
        if (state.state != PENDING) notify$1(this, state, false);
        return reaction.promise;
      },
      // `Promise.prototype.catch` method
      // https://tc39.github.io/ecma262/#sec-promise.prototype.catch
      'catch': function (onRejected) {
        return this.then(undefined, onRejected);
      }
    });
    OwnPromiseCapability = function () {
      var promise = new Internal();
      var state = getInternalState$2(promise);
      this.promise = promise;
      this.resolve = bind(internalResolve, promise, state);
      this.reject = bind(internalReject, promise, state);
    };
    newPromiseCapability.f = newPromiseCapability$1 = function (C) {
      return C === PromiseConstructor || C === PromiseWrapper
        ? new OwnPromiseCapability(C)
        : newGenericPromiseCapability(C);
    };
  }

  _export({ global: true, wrap: true, forced: FORCED }, {
    Promise: PromiseConstructor
  });

  setToStringTag(PromiseConstructor, PROMISE, false, true);
  setSpecies(PROMISE);

  PromiseWrapper = getBuiltIn(PROMISE);

  // statics
  _export({ target: PROMISE, stat: true, forced: FORCED }, {
    // `Promise.reject` method
    // https://tc39.github.io/ecma262/#sec-promise.reject
    reject: function reject(r) {
      var capability = newPromiseCapability$1(this);
      capability.reject.call(undefined, r);
      return capability.promise;
    }
  });

  _export({ target: PROMISE, stat: true, forced: isPure  }, {
    // `Promise.resolve` method
    // https://tc39.github.io/ecma262/#sec-promise.resolve
    resolve: function resolve(x) {
      return promiseResolve( this === PromiseWrapper ? PromiseConstructor : this, x);
    }
  });

  _export({ target: PROMISE, stat: true, forced: INCORRECT_ITERATION }, {
    // `Promise.all` method
    // https://tc39.github.io/ecma262/#sec-promise.all
    all: function all(iterable) {
      var C = this;
      var capability = newPromiseCapability$1(C);
      var resolve = capability.resolve;
      var reject = capability.reject;
      var result = perform(function () {
        var $promiseResolve = aFunction(C.resolve);
        var values = [];
        var counter = 0;
        var remaining = 1;
        iterate_1(iterable, function (promise) {
          var index = counter++;
          var alreadyCalled = false;
          values.push(undefined);
          remaining++;
          $promiseResolve.call(C, promise).then(function (value) {
            if (alreadyCalled) return;
            alreadyCalled = true;
            values[index] = value;
            --remaining || resolve(values);
          }, reject);
        });
        --remaining || resolve(values);
      });
      if (result.error) reject(result.value);
      return capability.promise;
    },
    // `Promise.race` method
    // https://tc39.github.io/ecma262/#sec-promise.race
    race: function race(iterable) {
      var C = this;
      var capability = newPromiseCapability$1(C);
      var reject = capability.reject;
      var result = perform(function () {
        var $promiseResolve = aFunction(C.resolve);
        iterate_1(iterable, function (promise) {
          $promiseResolve.call(C, promise).then(capability.resolve, reject);
        });
      });
      if (result.error) reject(result.value);
      return capability.promise;
    }
  });

  // `Promise.allSettled` method
  // https://github.com/tc39/proposal-promise-allSettled
  _export({ target: 'Promise', stat: true }, {
    allSettled: function allSettled(iterable) {
      var C = this;
      var capability = newPromiseCapability.f(C);
      var resolve = capability.resolve;
      var reject = capability.reject;
      var result = perform(function () {
        var promiseResolve = aFunction(C.resolve);
        var values = [];
        var counter = 0;
        var remaining = 1;
        iterate_1(iterable, function (promise) {
          var index = counter++;
          var alreadyCalled = false;
          values.push(undefined);
          remaining++;
          promiseResolve.call(C, promise).then(function (value) {
            if (alreadyCalled) return;
            alreadyCalled = true;
            values[index] = { status: 'fulfilled', value: value };
            --remaining || resolve(values);
          }, function (e) {
            if (alreadyCalled) return;
            alreadyCalled = true;
            values[index] = { status: 'rejected', reason: e };
            --remaining || resolve(values);
          });
        });
        --remaining || resolve(values);
      });
      if (result.error) reject(result.value);
      return capability.promise;
    }
  });

  // Safari bug https://bugs.webkit.org/show_bug.cgi?id=200829
  var NON_GENERIC = !!nativePromiseConstructor && fails(function () {
    nativePromiseConstructor.prototype['finally'].call({ then: function () { /* empty */ } }, function () { /* empty */ });
  });

  // `Promise.prototype.finally` method
  // https://tc39.github.io/ecma262/#sec-promise.prototype.finally
  _export({ target: 'Promise', proto: true, real: true, forced: NON_GENERIC }, {
    'finally': function (onFinally) {
      var C = speciesConstructor(this, getBuiltIn('Promise'));
      var isFunction = typeof onFinally == 'function';
      return this.then(
        isFunction ? function (x) {
          return promiseResolve(C, onFinally()).then(function () { return x; });
        } : onFinally,
        isFunction ? function (e) {
          return promiseResolve(C, onFinally()).then(function () { throw e; });
        } : onFinally
      );
    }
  });

  getCjsExportFromNamespace(es_object_toString);

  var promise$1 = path.Promise;

  var setInternalState$3 = internalState.set;
  var getInternalAggregateErrorState = internalState.getterFor('AggregateError');

  var $AggregateError = function AggregateError(errors, message) {
    var that = this;
    if (!(that instanceof $AggregateError)) return new $AggregateError(errors, message);
    if (objectSetPrototypeOf) {
      that = objectSetPrototypeOf(new Error(message), objectGetPrototypeOf(that));
    }
    var errorsArray = [];
    iterate_1(errors, errorsArray.push, errorsArray);
    if (descriptors) setInternalState$3(that, { errors: errorsArray, type: 'AggregateError' });
    else that.errors = errorsArray;
    if (message !== undefined) createNonEnumerableProperty(that, 'message', String(message));
    return that;
  };

  $AggregateError.prototype = objectCreate(Error.prototype, {
    constructor: createPropertyDescriptor(5, $AggregateError),
    message: createPropertyDescriptor(5, ''),
    name: createPropertyDescriptor(5, 'AggregateError')
  });

  if (descriptors) objectDefineProperty.f($AggregateError.prototype, 'errors', {
    get: function () {
      return getInternalAggregateErrorState(this).errors;
    },
    configurable: true
  });

  _export({ global: true }, {
    AggregateError: $AggregateError
  });

  // `Promise.try` method
  // https://github.com/tc39/proposal-promise-try
  _export({ target: 'Promise', stat: true }, {
    'try': function (callbackfn) {
      var promiseCapability = newPromiseCapability.f(this);
      var result = perform(callbackfn);
      (result.error ? promiseCapability.reject : promiseCapability.resolve)(result.value);
      return promiseCapability.promise;
    }
  });

  var PROMISE_ANY_ERROR = 'No one promise resolved';

  // `Promise.any` method
  // https://github.com/tc39/proposal-promise-any
  _export({ target: 'Promise', stat: true }, {
    any: function any(iterable) {
      var C = this;
      var capability = newPromiseCapability.f(C);
      var resolve = capability.resolve;
      var reject = capability.reject;
      var result = perform(function () {
        var promiseResolve = aFunction(C.resolve);
        var errors = [];
        var counter = 0;
        var remaining = 1;
        var alreadyResolved = false;
        iterate_1(iterable, function (promise) {
          var index = counter++;
          var alreadyRejected = false;
          errors.push(undefined);
          remaining++;
          promiseResolve.call(C, promise).then(function (value) {
            if (alreadyRejected || alreadyResolved) return;
            alreadyResolved = true;
            resolve(value);
          }, function (e) {
            if (alreadyRejected || alreadyResolved) return;
            alreadyRejected = true;
            errors[index] = e;
            --remaining || reject(new (getBuiltIn('AggregateError'))(errors, PROMISE_ANY_ERROR));
          });
        });
        --remaining || reject(new (getBuiltIn('AggregateError'))(errors, PROMISE_ANY_ERROR));
      });
      if (result.error) reject(result.value);
      return capability.promise;
    }
  });

  // TODO: Remove from `core-js@4`




  var promise$2 = promise$1;

  var promise$3 = promise$2;

  var runtime_1 = createCommonjsModule(function (module) {
  /**
   * Copyright (c) 2014-present, Facebook, Inc.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   */

  var runtime = (function (exports) {

    var Op = Object.prototype;
    var hasOwn = Op.hasOwnProperty;
    var undefined$1; // More compressible than void 0.
    var $Symbol = typeof Symbol === "function" ? Symbol : {};
    var iteratorSymbol = $Symbol.iterator || "@@iterator";
    var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
    var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";

    function wrap(innerFn, outerFn, self, tryLocsList) {
      // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
      var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
      var generator = Object.create(protoGenerator.prototype);
      var context = new Context(tryLocsList || []);

      // The ._invoke method unifies the implementations of the .next,
      // .throw, and .return methods.
      generator._invoke = makeInvokeMethod(innerFn, self, context);

      return generator;
    }
    exports.wrap = wrap;

    // Try/catch helper to minimize deoptimizations. Returns a completion
    // record like context.tryEntries[i].completion. This interface could
    // have been (and was previously) designed to take a closure to be
    // invoked without arguments, but in all the cases we care about we
    // already have an existing method we want to call, so there's no need
    // to create a new function object. We can even get away with assuming
    // the method takes exactly one argument, since that happens to be true
    // in every case, so we don't have to touch the arguments object. The
    // only additional allocation required is the completion record, which
    // has a stable shape and so hopefully should be cheap to allocate.
    function tryCatch(fn, obj, arg) {
      try {
        return { type: "normal", arg: fn.call(obj, arg) };
      } catch (err) {
        return { type: "throw", arg: err };
      }
    }

    var GenStateSuspendedStart = "suspendedStart";
    var GenStateSuspendedYield = "suspendedYield";
    var GenStateExecuting = "executing";
    var GenStateCompleted = "completed";

    // Returning this object from the innerFn has the same effect as
    // breaking out of the dispatch switch statement.
    var ContinueSentinel = {};

    // Dummy constructor functions that we use as the .constructor and
    // .constructor.prototype properties for functions that return Generator
    // objects. For full spec compliance, you may wish to configure your
    // minifier not to mangle the names of these two functions.
    function Generator() {}
    function GeneratorFunction() {}
    function GeneratorFunctionPrototype() {}

    // This is a polyfill for %IteratorPrototype% for environments that
    // don't natively support it.
    var IteratorPrototype = {};
    IteratorPrototype[iteratorSymbol] = function () {
      return this;
    };

    var getProto = Object.getPrototypeOf;
    var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
    if (NativeIteratorPrototype &&
        NativeIteratorPrototype !== Op &&
        hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
      // This environment has a native %IteratorPrototype%; use it instead
      // of the polyfill.
      IteratorPrototype = NativeIteratorPrototype;
    }

    var Gp = GeneratorFunctionPrototype.prototype =
      Generator.prototype = Object.create(IteratorPrototype);
    GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;
    GeneratorFunctionPrototype.constructor = GeneratorFunction;
    GeneratorFunctionPrototype[toStringTagSymbol] =
      GeneratorFunction.displayName = "GeneratorFunction";

    // Helper for defining the .next, .throw, and .return methods of the
    // Iterator interface in terms of a single ._invoke method.
    function defineIteratorMethods(prototype) {
      ["next", "throw", "return"].forEach(function(method) {
        prototype[method] = function(arg) {
          return this._invoke(method, arg);
        };
      });
    }

    exports.isGeneratorFunction = function(genFun) {
      var ctor = typeof genFun === "function" && genFun.constructor;
      return ctor
        ? ctor === GeneratorFunction ||
          // For the native GeneratorFunction constructor, the best we can
          // do is to check its .name property.
          (ctor.displayName || ctor.name) === "GeneratorFunction"
        : false;
    };

    exports.mark = function(genFun) {
      if (Object.setPrototypeOf) {
        Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
      } else {
        genFun.__proto__ = GeneratorFunctionPrototype;
        if (!(toStringTagSymbol in genFun)) {
          genFun[toStringTagSymbol] = "GeneratorFunction";
        }
      }
      genFun.prototype = Object.create(Gp);
      return genFun;
    };

    // Within the body of any async function, `await x` is transformed to
    // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
    // `hasOwn.call(value, "__await")` to determine if the yielded value is
    // meant to be awaited.
    exports.awrap = function(arg) {
      return { __await: arg };
    };

    function AsyncIterator(generator, PromiseImpl) {
      function invoke(method, arg, resolve, reject) {
        var record = tryCatch(generator[method], generator, arg);
        if (record.type === "throw") {
          reject(record.arg);
        } else {
          var result = record.arg;
          var value = result.value;
          if (value &&
              typeof value === "object" &&
              hasOwn.call(value, "__await")) {
            return PromiseImpl.resolve(value.__await).then(function(value) {
              invoke("next", value, resolve, reject);
            }, function(err) {
              invoke("throw", err, resolve, reject);
            });
          }

          return PromiseImpl.resolve(value).then(function(unwrapped) {
            // When a yielded Promise is resolved, its final value becomes
            // the .value of the Promise<{value,done}> result for the
            // current iteration.
            result.value = unwrapped;
            resolve(result);
          }, function(error) {
            // If a rejected Promise was yielded, throw the rejection back
            // into the async generator function so it can be handled there.
            return invoke("throw", error, resolve, reject);
          });
        }
      }

      var previousPromise;

      function enqueue(method, arg) {
        function callInvokeWithMethodAndArg() {
          return new PromiseImpl(function(resolve, reject) {
            invoke(method, arg, resolve, reject);
          });
        }

        return previousPromise =
          // If enqueue has been called before, then we want to wait until
          // all previous Promises have been resolved before calling invoke,
          // so that results are always delivered in the correct order. If
          // enqueue has not been called before, then it is important to
          // call invoke immediately, without waiting on a callback to fire,
          // so that the async generator function has the opportunity to do
          // any necessary setup in a predictable way. This predictability
          // is why the Promise constructor synchronously invokes its
          // executor callback, and why async functions synchronously
          // execute code before the first await. Since we implement simple
          // async functions in terms of async generators, it is especially
          // important to get this right, even though it requires care.
          previousPromise ? previousPromise.then(
            callInvokeWithMethodAndArg,
            // Avoid propagating failures to Promises returned by later
            // invocations of the iterator.
            callInvokeWithMethodAndArg
          ) : callInvokeWithMethodAndArg();
      }

      // Define the unified helper method that is used to implement .next,
      // .throw, and .return (see defineIteratorMethods).
      this._invoke = enqueue;
    }

    defineIteratorMethods(AsyncIterator.prototype);
    AsyncIterator.prototype[asyncIteratorSymbol] = function () {
      return this;
    };
    exports.AsyncIterator = AsyncIterator;

    // Note that simple async functions are implemented on top of
    // AsyncIterator objects; they just return a Promise for the value of
    // the final result produced by the iterator.
    exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {
      if (PromiseImpl === void 0) PromiseImpl = Promise;

      var iter = new AsyncIterator(
        wrap(innerFn, outerFn, self, tryLocsList),
        PromiseImpl
      );

      return exports.isGeneratorFunction(outerFn)
        ? iter // If outerFn is a generator, return the full iterator.
        : iter.next().then(function(result) {
            return result.done ? result.value : iter.next();
          });
    };

    function makeInvokeMethod(innerFn, self, context) {
      var state = GenStateSuspendedStart;

      return function invoke(method, arg) {
        if (state === GenStateExecuting) {
          throw new Error("Generator is already running");
        }

        if (state === GenStateCompleted) {
          if (method === "throw") {
            throw arg;
          }

          // Be forgiving, per 25.3.3.3.3 of the spec:
          // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
          return doneResult();
        }

        context.method = method;
        context.arg = arg;

        while (true) {
          var delegate = context.delegate;
          if (delegate) {
            var delegateResult = maybeInvokeDelegate(delegate, context);
            if (delegateResult) {
              if (delegateResult === ContinueSentinel) continue;
              return delegateResult;
            }
          }

          if (context.method === "next") {
            // Setting context._sent for legacy support of Babel's
            // function.sent implementation.
            context.sent = context._sent = context.arg;

          } else if (context.method === "throw") {
            if (state === GenStateSuspendedStart) {
              state = GenStateCompleted;
              throw context.arg;
            }

            context.dispatchException(context.arg);

          } else if (context.method === "return") {
            context.abrupt("return", context.arg);
          }

          state = GenStateExecuting;

          var record = tryCatch(innerFn, self, context);
          if (record.type === "normal") {
            // If an exception is thrown from innerFn, we leave state ===
            // GenStateExecuting and loop back for another invocation.
            state = context.done
              ? GenStateCompleted
              : GenStateSuspendedYield;

            if (record.arg === ContinueSentinel) {
              continue;
            }

            return {
              value: record.arg,
              done: context.done
            };

          } else if (record.type === "throw") {
            state = GenStateCompleted;
            // Dispatch the exception by looping back around to the
            // context.dispatchException(context.arg) call above.
            context.method = "throw";
            context.arg = record.arg;
          }
        }
      };
    }

    // Call delegate.iterator[context.method](context.arg) and handle the
    // result, either by returning a { value, done } result from the
    // delegate iterator, or by modifying context.method and context.arg,
    // setting context.delegate to null, and returning the ContinueSentinel.
    function maybeInvokeDelegate(delegate, context) {
      var method = delegate.iterator[context.method];
      if (method === undefined$1) {
        // A .throw or .return when the delegate iterator has no .throw
        // method always terminates the yield* loop.
        context.delegate = null;

        if (context.method === "throw") {
          // Note: ["return"] must be used for ES3 parsing compatibility.
          if (delegate.iterator["return"]) {
            // If the delegate iterator has a return method, give it a
            // chance to clean up.
            context.method = "return";
            context.arg = undefined$1;
            maybeInvokeDelegate(delegate, context);

            if (context.method === "throw") {
              // If maybeInvokeDelegate(context) changed context.method from
              // "return" to "throw", let that override the TypeError below.
              return ContinueSentinel;
            }
          }

          context.method = "throw";
          context.arg = new TypeError(
            "The iterator does not provide a 'throw' method");
        }

        return ContinueSentinel;
      }

      var record = tryCatch(method, delegate.iterator, context.arg);

      if (record.type === "throw") {
        context.method = "throw";
        context.arg = record.arg;
        context.delegate = null;
        return ContinueSentinel;
      }

      var info = record.arg;

      if (! info) {
        context.method = "throw";
        context.arg = new TypeError("iterator result is not an object");
        context.delegate = null;
        return ContinueSentinel;
      }

      if (info.done) {
        // Assign the result of the finished delegate to the temporary
        // variable specified by delegate.resultName (see delegateYield).
        context[delegate.resultName] = info.value;

        // Resume execution at the desired location (see delegateYield).
        context.next = delegate.nextLoc;

        // If context.method was "throw" but the delegate handled the
        // exception, let the outer generator proceed normally. If
        // context.method was "next", forget context.arg since it has been
        // "consumed" by the delegate iterator. If context.method was
        // "return", allow the original .return call to continue in the
        // outer generator.
        if (context.method !== "return") {
          context.method = "next";
          context.arg = undefined$1;
        }

      } else {
        // Re-yield the result returned by the delegate method.
        return info;
      }

      // The delegate iterator is finished, so forget it and continue with
      // the outer generator.
      context.delegate = null;
      return ContinueSentinel;
    }

    // Define Generator.prototype.{next,throw,return} in terms of the
    // unified ._invoke helper method.
    defineIteratorMethods(Gp);

    Gp[toStringTagSymbol] = "Generator";

    // A Generator should always return itself as the iterator object when the
    // @@iterator function is called on it. Some browsers' implementations of the
    // iterator prototype chain incorrectly implement this, causing the Generator
    // object to not be returned from this call. This ensures that doesn't happen.
    // See https://github.com/facebook/regenerator/issues/274 for more details.
    Gp[iteratorSymbol] = function() {
      return this;
    };

    Gp.toString = function() {
      return "[object Generator]";
    };

    function pushTryEntry(locs) {
      var entry = { tryLoc: locs[0] };

      if (1 in locs) {
        entry.catchLoc = locs[1];
      }

      if (2 in locs) {
        entry.finallyLoc = locs[2];
        entry.afterLoc = locs[3];
      }

      this.tryEntries.push(entry);
    }

    function resetTryEntry(entry) {
      var record = entry.completion || {};
      record.type = "normal";
      delete record.arg;
      entry.completion = record;
    }

    function Context(tryLocsList) {
      // The root entry object (effectively a try statement without a catch
      // or a finally block) gives us a place to store values thrown from
      // locations where there is no enclosing try statement.
      this.tryEntries = [{ tryLoc: "root" }];
      tryLocsList.forEach(pushTryEntry, this);
      this.reset(true);
    }

    exports.keys = function(object) {
      var keys = [];
      for (var key in object) {
        keys.push(key);
      }
      keys.reverse();

      // Rather than returning an object with a next method, we keep
      // things simple and return the next function itself.
      return function next() {
        while (keys.length) {
          var key = keys.pop();
          if (key in object) {
            next.value = key;
            next.done = false;
            return next;
          }
        }

        // To avoid creating an additional object, we just hang the .value
        // and .done properties off the next function object itself. This
        // also ensures that the minifier will not anonymize the function.
        next.done = true;
        return next;
      };
    };

    function values(iterable) {
      if (iterable) {
        var iteratorMethod = iterable[iteratorSymbol];
        if (iteratorMethod) {
          return iteratorMethod.call(iterable);
        }

        if (typeof iterable.next === "function") {
          return iterable;
        }

        if (!isNaN(iterable.length)) {
          var i = -1, next = function next() {
            while (++i < iterable.length) {
              if (hasOwn.call(iterable, i)) {
                next.value = iterable[i];
                next.done = false;
                return next;
              }
            }

            next.value = undefined$1;
            next.done = true;

            return next;
          };

          return next.next = next;
        }
      }

      // Return an iterator with no values.
      return { next: doneResult };
    }
    exports.values = values;

    function doneResult() {
      return { value: undefined$1, done: true };
    }

    Context.prototype = {
      constructor: Context,

      reset: function(skipTempReset) {
        this.prev = 0;
        this.next = 0;
        // Resetting context._sent for legacy support of Babel's
        // function.sent implementation.
        this.sent = this._sent = undefined$1;
        this.done = false;
        this.delegate = null;

        this.method = "next";
        this.arg = undefined$1;

        this.tryEntries.forEach(resetTryEntry);

        if (!skipTempReset) {
          for (var name in this) {
            // Not sure about the optimal order of these conditions:
            if (name.charAt(0) === "t" &&
                hasOwn.call(this, name) &&
                !isNaN(+name.slice(1))) {
              this[name] = undefined$1;
            }
          }
        }
      },

      stop: function() {
        this.done = true;

        var rootEntry = this.tryEntries[0];
        var rootRecord = rootEntry.completion;
        if (rootRecord.type === "throw") {
          throw rootRecord.arg;
        }

        return this.rval;
      },

      dispatchException: function(exception) {
        if (this.done) {
          throw exception;
        }

        var context = this;
        function handle(loc, caught) {
          record.type = "throw";
          record.arg = exception;
          context.next = loc;

          if (caught) {
            // If the dispatched exception was caught by a catch block,
            // then let that catch block handle the exception normally.
            context.method = "next";
            context.arg = undefined$1;
          }

          return !! caught;
        }

        for (var i = this.tryEntries.length - 1; i >= 0; --i) {
          var entry = this.tryEntries[i];
          var record = entry.completion;

          if (entry.tryLoc === "root") {
            // Exception thrown outside of any try block that could handle
            // it, so set the completion value of the entire function to
            // throw the exception.
            return handle("end");
          }

          if (entry.tryLoc <= this.prev) {
            var hasCatch = hasOwn.call(entry, "catchLoc");
            var hasFinally = hasOwn.call(entry, "finallyLoc");

            if (hasCatch && hasFinally) {
              if (this.prev < entry.catchLoc) {
                return handle(entry.catchLoc, true);
              } else if (this.prev < entry.finallyLoc) {
                return handle(entry.finallyLoc);
              }

            } else if (hasCatch) {
              if (this.prev < entry.catchLoc) {
                return handle(entry.catchLoc, true);
              }

            } else if (hasFinally) {
              if (this.prev < entry.finallyLoc) {
                return handle(entry.finallyLoc);
              }

            } else {
              throw new Error("try statement without catch or finally");
            }
          }
        }
      },

      abrupt: function(type, arg) {
        for (var i = this.tryEntries.length - 1; i >= 0; --i) {
          var entry = this.tryEntries[i];
          if (entry.tryLoc <= this.prev &&
              hasOwn.call(entry, "finallyLoc") &&
              this.prev < entry.finallyLoc) {
            var finallyEntry = entry;
            break;
          }
        }

        if (finallyEntry &&
            (type === "break" ||
             type === "continue") &&
            finallyEntry.tryLoc <= arg &&
            arg <= finallyEntry.finallyLoc) {
          // Ignore the finally entry if control is not jumping to a
          // location outside the try/catch block.
          finallyEntry = null;
        }

        var record = finallyEntry ? finallyEntry.completion : {};
        record.type = type;
        record.arg = arg;

        if (finallyEntry) {
          this.method = "next";
          this.next = finallyEntry.finallyLoc;
          return ContinueSentinel;
        }

        return this.complete(record);
      },

      complete: function(record, afterLoc) {
        if (record.type === "throw") {
          throw record.arg;
        }

        if (record.type === "break" ||
            record.type === "continue") {
          this.next = record.arg;
        } else if (record.type === "return") {
          this.rval = this.arg = record.arg;
          this.method = "return";
          this.next = "end";
        } else if (record.type === "normal" && afterLoc) {
          this.next = afterLoc;
        }

        return ContinueSentinel;
      },

      finish: function(finallyLoc) {
        for (var i = this.tryEntries.length - 1; i >= 0; --i) {
          var entry = this.tryEntries[i];
          if (entry.finallyLoc === finallyLoc) {
            this.complete(entry.completion, entry.afterLoc);
            resetTryEntry(entry);
            return ContinueSentinel;
          }
        }
      },

      "catch": function(tryLoc) {
        for (var i = this.tryEntries.length - 1; i >= 0; --i) {
          var entry = this.tryEntries[i];
          if (entry.tryLoc === tryLoc) {
            var record = entry.completion;
            if (record.type === "throw") {
              var thrown = record.arg;
              resetTryEntry(entry);
            }
            return thrown;
          }
        }

        // The context.catch method must only be called with a location
        // argument that corresponds to a known catch block.
        throw new Error("illegal catch attempt");
      },

      delegateYield: function(iterable, resultName, nextLoc) {
        this.delegate = {
          iterator: values(iterable),
          resultName: resultName,
          nextLoc: nextLoc
        };

        if (this.method === "next") {
          // Deliberately forget the last sent value so that we don't
          // accidentally pass it on to the delegate.
          this.arg = undefined$1;
        }

        return ContinueSentinel;
      }
    };

    // Regardless of whether this script is executing as a CommonJS module
    // or not, return the runtime object so that we can declare the variable
    // regeneratorRuntime in the outer scope, which allows this module to be
    // injected easily by `bin/regenerator --include-runtime script.js`.
    return exports;

  }(
    // If this script is executing as a CommonJS module, use module.exports
    // as the regeneratorRuntime namespace. Otherwise create a new empty
    // object. Either way, the resulting object will be used to initialize
    // the regeneratorRuntime variable at the top of this file.
     module.exports 
  ));

  try {
    regeneratorRuntime = runtime;
  } catch (accidentalStrictMode) {
    // This module should not be running in strict mode, so the above
    // assignment should always work unless something is misconfigured. Just
    // in case runtime.js accidentally runs in strict mode, we can escape
    // strict mode using a global Function call. This could conceivably fail
    // if a Content Security Policy forbids using Function, but in that case
    // the proper solution is to fix the accidental strict mode problem. If
    // you've misconfigured your bundler to force strict mode and applied a
    // CSP to forbid Function, and you're not willing to fix either of those
    // problems, please detail your unique predicament in a GitHub issue.
    Function("r", "regeneratorRuntime = r")(runtime);
  }
  });

  var regenerator = runtime_1;

  function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
    try {
      var info = gen[key](arg);
      var value = info.value;
    } catch (error) {
      reject(error);
      return;
    }

    if (info.done) {
      resolve(value);
    } else {
      promise$3.resolve(value).then(_next, _throw);
    }
  }

  function _asyncToGenerator(fn) {
    return function () {
      var self = this,
          args = arguments;
      return new promise$3(function (resolve, reject) {
        var gen = fn.apply(self, args);

        function _next(value) {
          asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value);
        }

        function _throw(err) {
          asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err);
        }

        _next(undefined);
      });
    };
  }

  // `IsArray` abstract operation
  // https://tc39.github.io/ecma262/#sec-isarray
  var isArray = Array.isArray || function isArray(arg) {
    return classofRaw(arg) == 'Array';
  };

  var createProperty = function (object, key, value) {
    var propertyKey = toPrimitive(key);
    if (propertyKey in object) objectDefineProperty.f(object, propertyKey, createPropertyDescriptor(0, value));
    else object[propertyKey] = value;
  };

  var SPECIES$3 = wellKnownSymbol('species');

  // `ArraySpeciesCreate` abstract operation
  // https://tc39.github.io/ecma262/#sec-arrayspeciescreate
  var arraySpeciesCreate = function (originalArray, length) {
    var C;
    if (isArray(originalArray)) {
      C = originalArray.constructor;
      // cross-realm fallback
      if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;
      else if (isObject(C)) {
        C = C[SPECIES$3];
        if (C === null) C = undefined;
      }
    } return new (C === undefined ? Array : C)(length === 0 ? 0 : length);
  };

  var SPECIES$4 = wellKnownSymbol('species');

  var arrayMethodHasSpeciesSupport = function (METHOD_NAME) {
    // We can't use this feature detection in V8 since it causes
    // deoptimization and serious performance degradation
    // https://github.com/zloirock/core-js/issues/677
    return engineV8Version >= 51 || !fails(function () {
      var array = [];
      var constructor = array.constructor = {};
      constructor[SPECIES$4] = function () {
        return { foo: 1 };
      };
      return array[METHOD_NAME](Boolean).foo !== 1;
    });
  };

  var IS_CONCAT_SPREADABLE = wellKnownSymbol('isConcatSpreadable');
  var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;
  var MAXIMUM_ALLOWED_INDEX_EXCEEDED = 'Maximum allowed index exceeded';

  // We can't use this feature detection in V8 since it causes
  // deoptimization and serious performance degradation
  // https://github.com/zloirock/core-js/issues/679
  var IS_CONCAT_SPREADABLE_SUPPORT = engineV8Version >= 51 || !fails(function () {
    var array = [];
    array[IS_CONCAT_SPREADABLE] = false;
    return array.concat()[0] !== array;
  });

  var SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('concat');

  var isConcatSpreadable = function (O) {
    if (!isObject(O)) return false;
    var spreadable = O[IS_CONCAT_SPREADABLE];
    return spreadable !== undefined ? !!spreadable : isArray(O);
  };

  var FORCED$1 = !IS_CONCAT_SPREADABLE_SUPPORT || !SPECIES_SUPPORT;

  // `Array.prototype.concat` method
  // https://tc39.github.io/ecma262/#sec-array.prototype.concat
  // with adding support of @@isConcatSpreadable and @@species
  _export({ target: 'Array', proto: true, forced: FORCED$1 }, {
    concat: function concat(arg) { // eslint-disable-line no-unused-vars
      var O = toObject(this);
      var A = arraySpeciesCreate(O, 0);
      var n = 0;
      var i, k, length, len, E;
      for (i = -1, length = arguments.length; i < length; i++) {
        E = i === -1 ? O : arguments[i];
        if (isConcatSpreadable(E)) {
          len = toLength(E.length);
          if (n + len > MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);
          for (k = 0; k < len; k++, n++) if (k in E) createProperty(A, n, E[k]);
        } else {
          if (n >= MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);
          createProperty(A, n++, E);
        }
      }
      A.length = n;
      return A;
    }
  });

  var entryVirtual = function (CONSTRUCTOR) {
    return path[CONSTRUCTOR + 'Prototype'];
  };

  var concat = entryVirtual('Array').concat;

  var ArrayPrototype$1 = Array.prototype;

  var concat_1 = function (it) {
    var own = it.concat;
    return it === ArrayPrototype$1 || (it instanceof Array && own === ArrayPrototype$1.concat) ? concat : own;
  };

  var concat$1 = concat_1;

  var concat$2 = concat$1;

  // Put variables in global scope to make them available to the browser console.
  var constraints = window.constraints = {
    audio: false,
    video: true
  };

  function handleSuccess(stream, element) {
    var video = element;
    var videoTracks = stream.getVideoTracks();
    console.log('Got stream with constraints:', constraints);
    console.log("Using video device: ".concat(videoTracks[0].label)); // window.stream = stream; // make variable available to browser console

    video.srcObject = stream;
  }

  function handleError(error) {
    if (error.name === 'ConstraintNotSatisfiedError') {
      var _context;

      var v = constraints.video;
      errorMsg(concat$2(_context = "The resolution ".concat(v.width.exact, "x")).call(_context, v.height.exact, " px is not supported by your device."));
    } else if (error.name === 'PermissionDeniedError') {
      errorMsg('Permissions have not been granted to use your camera and ' + 'microphone, you need to allow the page access to your devices in ' + 'order for the demo to work.');
    }

    errorMsg("getUserMedia error: ".concat(error.name), error);
  }

  function errorMsg(msg, error) {
    var errorElement = document.querySelector('#errorMsg');
    errorElement.innerHTML += "<p>".concat(msg, "</p>");

    if (typeof error !== 'undefined') {
      console.error(error);
    }
  }

  function openRTC(_x) {
    return _openRTC.apply(this, arguments);
  }

  function _openRTC() {
    _openRTC = _asyncToGenerator( /*#__PURE__*/regenerator.mark(function _callee(element) {
      var stream;
      return regenerator.wrap(function _callee$(_context2) {
        while (1) {
          switch (_context2.prev = _context2.next) {
            case 0:
              _context2.prev = 0;
              _context2.next = 3;
              return navigator.mediaDevices.getUserMedia(constraints);

            case 3:
              stream = _context2.sent;
              handleSuccess(stream, element);
              return _context2.abrupt("return", stream);

            case 8:
              _context2.prev = 8;
              _context2.t0 = _context2["catch"](0);
              handleError(_context2.t0);
              return _context2.abrupt("return", promise$3.reject(_context2.t0));

            case 12:
            case "end":
              return _context2.stop();
          }
        }
      }, _callee, null, [[0, 8]]);
    }));
    return _openRTC.apply(this, arguments);
  }

  var slice = [].slice;
  var MSIE = /MSIE .\./.test(engineUserAgent); // <- dirty ie9- check

  var wrap = function (scheduler) {
    return function (handler, timeout /* , ...arguments */) {
      var boundArgs = arguments.length > 2;
      var args = boundArgs ? slice.call(arguments, 2) : undefined;
      return scheduler(boundArgs ? function () {
        // eslint-disable-next-line no-new-func
        (typeof handler == 'function' ? handler : Function(handler)).apply(this, args);
      } : handler, timeout);
    };
  };

  // ie9- setTimeout & setInterval additional parameters fix
  // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#timers
  _export({ global: true, bind: true, forced: MSIE }, {
    // `setTimeout` method
    // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-settimeout
    setTimeout: wrap(global_1.setTimeout),
    // `setInterval` method
    // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-setinterval
    setInterval: wrap(global_1.setInterval)
  });

  var setInterval = path.setInterval;

  var setInterval$1 = setInterval;

  var setInterval$2 = setInterval$1;

  /**
   * mediaRecord 录屏方式
   * @param {*} mediaStream - webrtc 返回的媒体流，用于MediaRecord录制返回blob视频段
   * @param {*} cb - MediaRecord 每次录屏返回的视频段传入执行回调
   * @param {*} config - {collectTime：每次录得的视频段的时长，ended：录屏结束后的回调}
   * @returns {*} mediaRecorder, 用于外部停止录屏等操作
   * 与 MediaStreamRecord.js 的录屏差异：
   * startRecording() {... setTimeout(stopRecording, 3000)}
   * mediaRecorder.onstop() { startRecording()}
   * 此方式录制出来的视频段是完整的独立的视频段，而本方法录制的视频段是整个视频段切割成的若干部分
   */
  function RTCRecord(mediaStream, cb) {
    var config = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
    var stream = null;
    var collectTime = config.collectTime || 1000;
    var options = {
      mimeType: 'video/webm;codecs=vp9'
    };
    var mediaRecorder = null;

    function getMimeType() {
      var options = {
        mimeType: 'video/webm;codecs=vp9'
      };

      if (!MediaRecorder.isTypeSupported(options.mimeType)) {
        console.error("".concat(options.mimeType, " is not Supported"));
        options = {
          mimeType: 'video/webm;codecs=vp8'
        };

        if (!MediaRecorder.isTypeSupported(options.mimeType)) {
          console.error("".concat(options.mimeType, " is not Supported"));
          options = {
            mimeType: 'video/webm'
          };

          if (!MediaRecorder.isTypeSupported(options.mimeType)) {
            console.error("".concat(options.mimeType, " is not Supported"));
            options = {
              mimeType: ''
            };
          }
        }
      }

      return options;
    }

    function startRecording() {
      try {
        mediaRecorder = new MediaRecorder(stream, options);
      } catch (e) {
        console.error('Exception while creating MediaRecorder:', e);
        return;
      }

      mediaRecorder.onstop = function (event) {
        mediaRecorder = null;
        config.ended && config.ended();
      };

      mediaRecorder.ondataavailable = handleDataAvailable;
      mediaRecorder.start(collectTime); // collect 1000ms of data
      // setTimeout(stopRecording, 3000)
    }

    function handleDataAvailable(event) {
      if (event.data && event.data.size > 0) {
        // recordedBlobs.push(event.data);
        // stream && startRecording()
        cb && cb(event.data);
      }
    } // function stopRecording() {
    //   mediaRecorder.stop();
    // }


    stream = mediaStream;
    options = getMimeType();
    startRecording();

    mediaStream.onended = function () {
      mediaStream = stream = null;
    };

    return mediaRecorder;
  }
  /**
   * 在视频开始播放前调用canvas定时录屏
   * @param {DOM} video  -  要录制的原视频DOM对象
   * @param {*} cb  -  每次录屏 返回的'image/webp' 图片数据
   * @param {*} options  -  {duration: 录屏间隔时长，ended: 录屏结束的回调方法 }
   * @returns {Promise}  -  stop: 停止录屏接口，canvasRecordPromise： 判断是否成功录屏
   */

  function CanvasRecord(video, cb) {
    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
    var timer = null;
    var videoHeight = video.videoHeight || video.clientHeight;
    var videoWidth = video.videoWidth || video.clientWidth;
    var record = {
      ondataavailable: function ondataavailable() {},
      onstop: function onstop() {},
      stop: stopRecord,
      start: function start() {
        video.play();
      }
    }; // 视频开始播放

    video.addEventListener('canplay', startRecord, false); // 视频播放完

    video.addEventListener('ended', endRecord, false);
    var canvas = document.createElement('canvas');
    canvas.style.display = 'none';
    canvas.setAttribute('height', videoHeight);
    canvas.setAttribute('width', videoWidth);

    function recordFunc() {
      var context = canvas.getContext('2d');
      context.drawImage(video, 0, 0, videoHeight, videoWidth);
      canvas.toBlob(function (blob) {
        record.ondataavailable(blob, context);
      }, 'image/webp');
    }

    function startRecord() {
      recordFunc();
      timer = setInterval$2(function () {
        recordFunc();
      }, options.duration || 200);
    }

    function endRecord() {
      stopRecord();
      record.onstop();
      console.log('视频录制结束!');
    }

    function stopRecord() {
      timer && clearInterval(timer);
      video.removeEventListener('canplay', startRecord, false);
      video.removeEventListener('ended', endRecord, false);
      canvas = null;
    }

    return record;
  }
  /**
   * This method stops recording MediaStream.
   * @param {MediaStream} mediaStream - webrtc 返回的媒体流，用于MediaRecord录制返回blob视频段
   * @param {DOM} video - webrtc 的呈现视频的video元素，用于Canvas 返回视频画面
   * @param {function} callback - Callback function, that is used to pass recorded blob back to the callee.
   * @param {Object} config - duration：canvas 每隔{duration}捕获视频画面，collectTime：MediaRecord 每次捕获{collectTime}时长的视频段
   * @method
   * @memberof MediaStreamRecorder
   * @example
   * webrtcRecorde(stream, config.video, function(data) {
   *         worker.send(data)
   *      })
   */

  function record(mediaStream, video, cb) {
    var config = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
    return typeof MediaRecorder !== 'undefined' ? RTCRecord(mediaStream, cb, config) : CanvasRecord(video, cb, config);
  }

  var getVideoByInput = null;

  function getInput() {
    if (getVideoByInput) return getVideoByInput;
    var input = document.createElement('input');
    getVideoByInput = input;
    input.setAttribute('type', 'file');
    input.setAttribute('accept', 'video/*');
    input.setAttribute('capture', 'user');
    input.style.display = 'none';
    document.body.append(input);
    return input;
  }

  function getVideo() {
    var input = getInput();
    return new promise$3(function (resolve) {
      input.onchange = function (e) {
        resolve(e.target.files[0]);
      };

      input.click();
    });
  }

  var f$4 = Object.getOwnPropertySymbols;

  var objectGetOwnPropertySymbols = {
  	f: f$4
  };

  var nativeAssign = Object.assign;
  var defineProperty$1 = Object.defineProperty;

  // `Object.assign` method
  // https://tc39.github.io/ecma262/#sec-object.assign
  var objectAssign = !nativeAssign || fails(function () {
    // should have correct order of operations (Edge bug)
    if (descriptors && nativeAssign({ b: 1 }, nativeAssign(defineProperty$1({}, 'a', {
      enumerable: true,
      get: function () {
        defineProperty$1(this, 'b', {
          value: 3,
          enumerable: false
        });
      }
    }), { b: 2 })).b !== 1) return true;
    // should work with symbols and should have deterministic property order (V8 bug)
    var A = {};
    var B = {};
    // eslint-disable-next-line no-undef
    var symbol = Symbol();
    var alphabet = 'abcdefghijklmnopqrst';
    A[symbol] = 7;
    alphabet.split('').forEach(function (chr) { B[chr] = chr; });
    return nativeAssign({}, A)[symbol] != 7 || objectKeys(nativeAssign({}, B)).join('') != alphabet;
  }) ? function assign(target, source) { // eslint-disable-line no-unused-vars
    var T = toObject(target);
    var argumentsLength = arguments.length;
    var index = 1;
    var getOwnPropertySymbols = objectGetOwnPropertySymbols.f;
    var propertyIsEnumerable = objectPropertyIsEnumerable.f;
    while (argumentsLength > index) {
      var S = indexedObject(arguments[index++]);
      var keys = getOwnPropertySymbols ? objectKeys(S).concat(getOwnPropertySymbols(S)) : objectKeys(S);
      var length = keys.length;
      var j = 0;
      var key;
      while (length > j) {
        key = keys[j++];
        if (!descriptors || propertyIsEnumerable.call(S, key)) T[key] = S[key];
      }
    } return T;
  } : nativeAssign;

  // `Object.assign` method
  // https://tc39.github.io/ecma262/#sec-object.assign
  _export({ target: 'Object', stat: true, forced: Object.assign !== objectAssign }, {
    assign: objectAssign
  });

  var assign = path.Object.assign;

  var assign$1 = assign;

  var assign$2 = assign$1;

  var config = {
    width: 450,
    height: 450,
    duration: 100,
    MAXTIME: 15,
    MINSIZE: 1048576 // 最小1M，1M内直接返回file数据，不做压缩处理

  };
  var URL = window.URL || window.webkitURL; // 页面上创建一个video用于抽帧

  function createPlayVideo() {
    var video = document.createElement('video');
    video.setAttribute('width', config.width);
    video.setAttribute('height', config.height);
    video.style.width = config.width;
    video.style.height = config.height;
    video.style.visibility = 'hidden';
    video.style.position = 'fixed';
    video.style.zIndex = -99999;
    video.muted = true;
    document.body.append(video);
    return video;
  } // 文件转化为blob地址


  function getFileURL(file) {
    var createObjectURL = URL.createObjectURL;
    if (createObjectURL) return createObjectURL(file);
    return new promise$3(function (resolve) {
      var reader = new FileReader();
      reader.readAsDataURL(file);

      reader.onload = function () {
        resolve(reader.result);
      };
    });
  }
  /**
   * 利用canvas实现视频抽帧
   * @param {*} videoFile -  input获取的file文件
   * @param {*} cb        -  返回image/webp的图片chunks
   * @param {*} option    -  配置 {duration(录屏间隔), MAXTIME(要求视频最大时长), MINSIZE(要求视频最小size)}
   * @return {Promise}    -  录屏结束会resolve掉promise，返回的record可以提供给外部随时stop掉录屏
   */


  function pressVideo(_x, _x2, _x3) {
    return _pressVideo.apply(this, arguments);
  }

  function _pressVideo() {
    _pressVideo = _asyncToGenerator( /*#__PURE__*/regenerator.mark(function _callee(videoFile, cb, options) {
      var video, record;
      return regenerator.wrap(function _callee$(_context2) {
        while (1) {
          switch (_context2.prev = _context2.next) {
            case 0:
              _context2.prev = 0;
              options && assign$2(config, options); // 自定义配置

              video = createPlayVideo(); // 视频太小，可直接返回文件

              if (!(videoFile.size < config.MINSIZE)) {
                _context2.next = 7;
                break;
              }

              console.info("\u89C6\u9891\u5C0F\u4E8E".concat(config.MINSIZE, ", \u4E0D\u505A\u5904\u7406"));
              cb && cb(videoFile);
              return _context2.abrupt("return", videoFile);

            case 7:
              video.onloadedmetadata = function () {
                if (video.duration > config.MAXTIME) {
                  var _context;

                  URL.revokeObjectURL(video.src); // 释放blob资源

                  record.stop(); // 移除video的监听事件

                  throw new Error(concat$2(_context = "\u89C6\u9891\u65F6\u957F".concat(video.duration, "\u8D85\u8FC7")).call(_context, config.MAXTIME));
                }
              };

              _context2.next = 10;
              return getFileURL(videoFile);

            case 10:
              video.src = _context2.sent;
              record = CanvasRecord(video, cb, options); // 监听play事件，准备录屏

              record.ondataavailable = cb;

              record.onstop = function () {
                document.body.removeChild(video);
                video = null;
                config.ended && config.ended();
              };

              record.start();
              return _context2.abrupt("return", record);

            case 18:
              _context2.prev = 18;
              _context2.t0 = _context2["catch"](0);
              console.error(_context2.t0);
              return _context2.abrupt("return", promise$3.reject(_context2.t0));

            case 22:
            case "end":
              return _context2.stop();
          }
        }
      }, _callee, null, [[0, 18]]);
    }));
    return _pressVideo.apply(this, arguments);
  }

  function webrtcSurport() {
    return !!navigator.mediaDevices.getUserMedia;
  }

  function getDOM(dom) {
    if (typeof dom === 'string') return dom = document.querySelector(dom);
    return dom;
  }

  function degrade(_x) {
    return _degrade.apply(this, arguments);
  }
  /**
   * 优先唤起webRTC录制视频，若不支持则降级用上传本地视频方式，IE录屏推荐用rtmp-streamer
   * @param {*} config { chunks: 每次录屏返回的数据包(webp/webm),
   *                     ended: 录屏结束回调方法，
   *                     duration： 录屏间隔时间，
   *                     collectTime: 录制的视频时长,
   *                     MINSIZE: 最小视频size，低于此值，则直接返回视频不做处理
   *                     MAXTIME: 视频的最大时长限制}
   * @return {Promise} 返回初始化成功后的相关配置信息，提供给外部随时stop录屏的接口
   * let recorder = await openVideo({
   *     video: document.getElementById('webrtc'),
   *     duration: 100,
   *     MINSIZE: 1024,
   *     MAXTIME: 15,
   *     chunks(chunk) {
   *       // sender chunks
   *
   *     },
   *     ended() {
   *       // record chunks ended
   *     },
   *     degrade:document.getElementById('p') // 不支持webRTC则降级处理打开本地视频
   *   })
   *
   *   setTimeout(() => {
   *       recorder.stop()
   *     }, 5000)
   */


  function _degrade() {
    _degrade = _asyncToGenerator( /*#__PURE__*/regenerator.mark(function _callee(config) {
      var file, record;
      return regenerator.wrap(function _callee$(_context) {
        while (1) {
          switch (_context.prev = _context.next) {
            case 0:
              _context.next = 2;
              return getVideo();

            case 2:
              file = _context.sent;
              _context.next = 5;
              return pressVideo(file, config.chunks, config);

            case 5:
              record = _context.sent;
              return _context.abrupt("return", record);

            case 7:
            case "end":
              return _context.stop();
          }
        }
      }, _callee);
    }));
    return _degrade.apply(this, arguments);
  }

  function openVideo(_x2) {
    return _openVideo.apply(this, arguments);
  }

  function _openVideo() {
    _openVideo = _asyncToGenerator( /*#__PURE__*/regenerator.mark(function _callee2(config) {
      var isWebrtcSurport, stream, record$1, resolveP, promise;
      return regenerator.wrap(function _callee2$(_context2) {
        while (1) {
          switch (_context2.prev = _context2.next) {
            case 0:
              isWebrtcSurport = webrtcSurport();

              if (!isWebrtcSurport) {
                _context2.next = 9;
                break;
              }

              _context2.next = 4;
              return openRTC(config.video);

            case 4:
              stream = _context2.sent;
              record$1 = record(stream, config.video, config.chunks, config);
              return _context2.abrupt("return", {
                stop: function stop() {
                  var tracks = stream.getTracks();
                  tracks[0].stop();
                  record$1.stop();
                }
              });

            case 9:
              if (config.degrade) {
                _context2.next = 11;
                break;
              }

              return _context2.abrupt("return", promise$3.reject({
                isWebrtcSurport: false
              }));

            case 11:
              if (!(config.degrade === true)) {
                _context2.next = 13;
                break;
              }

              return _context2.abrupt("return", degrade(config));

            case 13:
              if (!config.degrade) {
                _context2.next = 18;
                break;
              }

              resolveP = null;
              promise = new promise$3(function (resolve) {
                return resolveP = resolve;
              });
              getDOM(config.degrade).addEventListener('click', function () {
                degrade(config).then(resolveP);
              });
              return _context2.abrupt("return", promise);

            case 18:
            case "end":
              return _context2.stop();
          }
        }
      }, _callee2);
    }));
    return _openVideo.apply(this, arguments);
  }

  exports.openVideo = openVideo;
  exports.webrtcSurport = webrtcSurport;

  return exports;

}({}));