bwindels · September 24, 2020 12:17
diff --git a/idb-promises.html b/idb-promises.html
 <!DOCTYPE html>
 <html>
 <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
    <script type="text/javascript" src="promifill.js"></script>
    <!-- <script src="https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js"></script> -->
    <script type="text/javascript">
        function reqAsPromise(req) {
            return new Promise(function (resolve, reject) {
                req.onsuccess = function() {resolve(req);};
                req.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
            });
        }

        function Storage(databaseName) {
            this._databaseName = databaseName;
            this._database = null;
        }

        Storage.prototype = {
            open: function() {
                const req = window.indexedDB.open(this._databaseName);
                const self = this;
                req.onupgradeneeded = function(ev) {
                    const db = ev.target.result;
                    const oldVersion = ev.oldVersion;
                    self._createStores(db, oldVersion);
                }; 
                return reqAsPromise(req).then(function() {
                    self._database = req.result;
                });
            },
            openTxn: function(mode, storeName) {
                const tx = this._database.transaction([storeName], mode);
                const store = tx.objectStore(storeName);
                return Promise.resolve(store);
            },
            _createStores: function(db) {
                db.createObjectStore("foos", {keyPath: ["id"]});
            }
        };

        function getAll(store) {
            const request = store.openCursor();
            const results = [];
            return new Promise(function(resolve, reject) {
                request.onsuccess = function(event) {
                    const cursor = event.target.result;
                    if(cursor) {
                        results.push(cursor.value);
                        cursor.continue();
                    } else {
                        resolve(results);
                    }
                };
                request.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
            });
        }

        function main() {
            let storage = new Storage("idb-promises");
            let store;
            storage.open().then(function() {
                return storage.openTxn("readwrite", "foos");
            }).then(function(s) {
                store = s;
                store.clear();
                store.add({id: 5, name: "foo"});
                store.add({id: 6, name: "bar"});
                return getAll(store);
            }).then(function(all) {
                console.log("all1", all);
                store.add({id: 7, name: "bazzz"});
                return getAll(store);
            }).then(function(all) {
                console.log("all2", all);
            }).catch(function(err) {
                console.error(err.message + ": " + err.stack);
            });
        }
        main();

    </script>
 </body>
 </html>
diff --git a/promifill.js b/promifill.js
 "use strict";

 function _createForOfIteratorHelper(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }

 function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

 function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

 function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

 var PENDING = void 0,
    FULFILLED = true,
    REJECTED = false;

 var Promifill = /*#__PURE__*/function () {
  _createClass(Promifill, [{
    key: "state",
    get: function get() {
      return PENDING;
    }
  }, {
    key: "value",
    get: function get() {
      return void 0;
    }
  }, {
    key: "settled",
    get: function get() {
      return false;
    }
  }]);

  function Promifill(executor) {
    var _this = this;

    _classCallCheck(this, Promifill);

    if (typeof executor != "function") {
      throw new TypeError("Promise resolver ".concat(Object.prototype.toString.call(executor), " is not a function"));
    }

    defineProperty(this, "chain", []);
    defineProperty(this, "observers", []);
    var secret = [];

    var resolve = function resolve(value, bypassKey) {
      if (_this.settled && bypassKey !== secret) {
        return;
      }

      defineProperty(_this, "settled", true);
      var then_ = value && value.then;
      var thenable = typeof then_ == "function";

      if (thenable) {
        defineProperty(value, "preventThrow", true);
      }

      if (thenable && value.state === PENDING) {
        then_.call(value, function (v) {
          return resolve(v, secret);
        }, function (r) {
          return reject(r, secret);
        });
      } else {
        defineProperty(_this, "value", thenable ? value.value : value);
        defineProperty(_this, "state", thenable ? value.state : FULFILLED);
        schedule(_this.observers.map(function (observer) {
          return {
            handler: _this.state === FULFILLED ? observer.onfulfill : observer.onreject,
            value: _this.value
          };
        }));

        if (_this.state === REJECTED) {
          raiseUnhandledPromiseRejectionException(_this.value, _this);
        }
      }
    };

    var reject = function reject(reason, bypassKey) {
      if (_this.settled && bypassKey !== secret) {
        return;
      }

      defineProperty(_this, "settled", true);
      defineProperty(_this, "value", reason);
      defineProperty(_this, "state", REJECTED);
      schedule(_this.observers.map(function (observer) {
        return {
          handler: observer.onreject,
          value: _this.value
        };
      }));
      raiseUnhandledPromiseRejectionException(_this.value, _this);
    };

    try {
      executor(resolve, reject);
    } catch (error) {
      reject(error);
    }
  }

  _createClass(Promifill, [{
    key: "then",
    value: function then(onfulfill, onreject) {
      var _this2 = this;

      var chainedPromise = new this.constructor(function (resolve, reject) {
        var internalOnfulfill = function internalOnfulfill(value) {
          try {
            resolve(typeof onfulfill == "function" ? onfulfill(value) : value);
          } catch (error) {
            reject(error);
          }
        };

        var internalOnreject = function internalOnreject(reason) {
          try {
            if (typeof onreject == "function") {
              resolve(onreject(reason));
            } else {
              reject(reason);
            }
          } catch (error) {
            reject(error);
          }
        };

        if (_this2.state === PENDING) {
          _this2.observers.push({
            onfulfill: internalOnfulfill,
            onreject: internalOnreject
          });
        } else {
          schedule([{
            handler: _this2.state === FULFILLED ? internalOnfulfill : internalOnreject,
            value: _this2.value
          }]);
        }
      });
      this.chain.push(chainedPromise);
      return chainedPromise;
    }
  }, {
    key: "catch",
    value: function _catch(onreject) {
      return this.then(null, onreject);
    }
  }, {
    key: "finally",
    value: function _finally(oncomplete) {
      var _this3 = this;

      var chainedPromise = new this.constructor(function (resolve, reject) {
        var internalOncomplete = function internalOncomplete() {
          try {
            oncomplete();

            if (_this3.state === FULFILLED) {
              resolve(_this3.value);
            } else {
              reject(_this3.value);
            }
          } catch (error) {
            reject(error);
          }
        };

        if (_this3.state === PENDING) {
          _this3.observers.push({
            onfulfill: internalOncomplete,
            onreject: internalOncomplete
          });
        } else {
          schedule([{
            handler: internalOncomplete
          }]);
        }
      });
      this.chain.push(chainedPromise);
      return chainedPromise;
    }
  }], [{
    key: "resolve",
    value: function resolve(value) {
      return value && value.constructor === Promifill ? value : new Promifill(function (resolve) {
        resolve(value);
      });
    }
  }, {
    key: "reject",
    value: function reject(reason) {
      return new Promifill(function (_, reject) {
        reject(reason);
      });
    }
  }, {
    key: "all",
    value: function all(iterable) {
      return new Promifill(function (resolve, reject) {
        validateIterable(iterable);
        var iterableSize = 0;
        var values = [];

        if (isEmptyIterable(iterable)) {
          return resolve(values);
        }

        var add = function add(value, index) {
          values[index] = value;

          if (values.filter(function () {
            return true;
          }).length === iterableSize) {
            resolve(values);
          }
        };

        var _iterator = _createForOfIteratorHelper(iterable),
            _step;

        try {
          for (_iterator.s(); !(_step = _iterator.n()).done;) {
            var item = _step.value;

            (function (entry, index) {
              Promifill.resolve(entry).then(function (value) {
                return add(value, index);
              }, reject);
            })(item, iterableSize++);
          }
        } catch (err) {
          _iterator.e(err);
        } finally {
          _iterator.f();
        }
      });
    }
  }, {
    key: "race",
    value: function race(iterable) {
      return new Promifill(function (resolve, reject) {
        validateIterable(iterable);

        if (isEmptyIterable(iterable)) {
          return;
        }

        var _iterator2 = _createForOfIteratorHelper(iterable),
            _step2;

        try {
          for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
            var entry = _step2.value;
            Promifill.resolve(entry).then(resolve, reject);
          }
        } catch (err) {
          _iterator2.e(err);
        } finally {
          _iterator2.f();
        }
      });
    }
  }]);

  return Promifill;
 }();

 var defineProperty = function defineProperty(obj, propName, propValue) {
  Object.defineProperty(obj, propName, {
    value: propValue
  });
 };

 var defer = function defer(handler) {
  return function () {
    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    setTimeout.apply(void 0, [handler, 0].concat(args));
  };
 };

 var thrower = function thrower(error) {
  throw error instanceof Error ? error : new Error(error);
 };

 var raiseUnhandledPromiseRejectionException = defer(function (error, promise) {
  if (promise.preventThrow || promise.chain.length > 0) {
    return;
  }

  thrower(error);
 });

 var MutationObserverStrategy = /*#__PURE__*/function () {
  function MutationObserverStrategy(handler) {
    _classCallCheck(this, MutationObserverStrategy);

    var observer = new MutationObserver(handler);
    var node = this.node = document.createTextNode("");
    observer.observe(node, {
      characterData: true
    });
  }

  _createClass(MutationObserverStrategy, [{
    key: "trigger",
    value: function trigger() {
      this.node.data = this.node.data === 1 ? 0 : 1;
    }
  }]);

  return MutationObserverStrategy;
 }();

 var NextTickStrategy = /*#__PURE__*/function () {
  function NextTickStrategy(handler) {
    _classCallCheck(this, NextTickStrategy);

    this.scheduleNextTick = function () {
      return process.nextTick(handler);
    };
  }

  _createClass(NextTickStrategy, [{
    key: "trigger",
    value: function trigger() {
      this.scheduleNextTick();
    }
  }]);

  return NextTickStrategy;
 }();

 var BetterThanNothingStrategy = /*#__PURE__*/function () {
  function BetterThanNothingStrategy(handler) {
    _classCallCheck(this, BetterThanNothingStrategy);

    this.scheduleAsap = function () {
      return setTimeout(handler, 0);
    };
  }

  _createClass(BetterThanNothingStrategy, [{
    key: "trigger",
    value: function trigger() {
      this.scheduleAsap();
    }
  }]);

  return BetterThanNothingStrategy;
 }();

 var getStrategy = function getStrategy() {
  if (typeof window != "undefined" && typeof window.MutationObserver == "function") {
    return MutationObserverStrategy;
  }

  if (typeof global != "undefined" && typeof process != "undefined" && typeof process.nextTick == "function") {
    return NextTickStrategy;
  }

  return BetterThanNothingStrategy;
 };

 var schedule = function () {
  var microtasks = [];

  var run = function run() {
    var handler, value;

    while (microtasks.length > 0 && (_microtasks$shift = microtasks.shift(), handler = _microtasks$shift.handler, value = _microtasks$shift.value, _microtasks$shift)) {
      var _microtasks$shift;

      handler(value);
    }
  };

  var Strategy = getStrategy();
  var ctrl = new Strategy(run);
  return function (observers) {
    if (observers.length == 0) {
      return;
    }

    microtasks = microtasks.concat(observers);
    observers.length = 0;
    ctrl.trigger();
  };
 }();

 var isIterable = function isIterable(subject) {
  return subject != null && typeof subject[Symbol.iterator] == "function";
 };

 var validateIterable = function validateIterable(subject) {
  if (isIterable(subject)) {
    return;
  }

  throw new TypeError("Cannot read property 'Symbol(Symbol.iterator)' of ".concat(Object.prototype.toString.call(subject), "."));
 };

 var isEmptyIterable = function isEmptyIterable(subject) {
  var _iterator3 = _createForOfIteratorHelper(subject),
      _step3;

  try {
    for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
      var _ = _step3.value;
      // eslint-disable-line no-unused-vars
      return false;
    }
  } catch (err) {
    _iterator3.e(err);
  } finally {
    _iterator3.f();
  }

  return true;
 };

 if (!window.Promise) {
    window.Promise = Promifill;
 }
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	</head>
	<body>
	<script type="text/javascript" src="promifill.js"></script>
	<!-- <script src="https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js"></script> -->
	<script type="text/javascript">
	function reqAsPromise(req) {
	return new Promise(function (resolve, reject) {
	req.onsuccess = function() {resolve(req);};
	req.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
	});
	}

	function Storage(databaseName) {
	this._databaseName = databaseName;
	this._database = null;
	}

	Storage.prototype = {
	open: function() {
	const req = window.indexedDB.open(this._databaseName);
	const self = this;
	req.onupgradeneeded = function(ev) {
	const db = ev.target.result;
	const oldVersion = ev.oldVersion;
	self._createStores(db, oldVersion);
	};
	return reqAsPromise(req).then(function() {
	self._database = req.result;
	});
	},
	openTxn: function(mode, storeName) {
	const tx = this._database.transaction([storeName], mode);
	const store = tx.objectStore(storeName);
	return Promise.resolve(store);
	},
	_createStores: function(db) {
	db.createObjectStore("foos", {keyPath: ["id"]});
	}
	};

	function getAll(store) {
	const request = store.openCursor();
	const results = [];
	return new Promise(function(resolve, reject) {
	request.onsuccess = function(event) {
	const cursor = event.target.result;
	if(cursor) {
	results.push(cursor.value);
	cursor.continue();
	} else {
	resolve(results);
	}
	};
	request.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
	});
	}

	function main() {
	let storage = new Storage("idb-promises");
	let store;
	storage.open().then(function() {
	return storage.openTxn("readwrite", "foos");
	}).then(function(s) {
	store = s;
	store.clear();
	store.add({id: 5, name: "foo"});
	store.add({id: 6, name: "bar"});
	return getAll(store);
	}).then(function(all) {
	console.log("all1", all);
	store.add({id: 7, name: "bazzz"});
	return getAll(store);
	}).then(function(all) {
	console.log("all2", all);
	}).catch(function(err) {
	console.error(err.message + ": " + err.stack);
	});
	}
	main();

	</script>
	</body>
	</html>
	"use strict";

	function _createForOfIteratorHelper(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" \|\| o[Symbol.iterator] == null) { if (Array.isArray(o) \|\| (it = _unsupportedIterableToArray(o)) \|\| allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }

	function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" \|\| n === "Set") return Array.from(o); if (n === "Arguments" \|\| /^(?:Ui\|I)nt(?:8\|16\|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

	function _arrayLikeToArray(arr, len) { if (len == null \|\| len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

	function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

	function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable \|\| false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

	function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

	var PENDING = void 0,
	FULFILLED = true,
	REJECTED = false;

	var Promifill = /#__PURE__/function () {
	_createClass(Promifill, [{
	key: "state",
	get: function get() {
	return PENDING;
	}
	}, {
	key: "value",
	get: function get() {
	return void 0;
	}
	}, {
	key: "settled",
	get: function get() {
	return false;
	}
	}]);

	function Promifill(executor) {
	var _this = this;

	_classCallCheck(this, Promifill);

	if (typeof executor != "function") {
	throw new TypeError("Promise resolver ".concat(Object.prototype.toString.call(executor), " is not a function"));
	}

	defineProperty(this, "chain", []);
	defineProperty(this, "observers", []);
	var secret = [];

	var resolve = function resolve(value, bypassKey) {
	if (_this.settled && bypassKey !== secret) {
	return;
	}

	defineProperty(_this, "settled", true);
	var then_ = value && value.then;
	var thenable = typeof then_ == "function";

	if (thenable) {
	defineProperty(value, "preventThrow", true);
	}

	if (thenable && value.state === PENDING) {
	then_.call(value, function (v) {
	return resolve(v, secret);
	}, function (r) {
	return reject(r, secret);
	});
	} else {
	defineProperty(_this, "value", thenable ? value.value : value);
	defineProperty(_this, "state", thenable ? value.state : FULFILLED);
	schedule(_this.observers.map(function (observer) {
	return {
	handler: _this.state === FULFILLED ? observer.onfulfill : observer.onreject,
	value: _this.value
	};
	}));

	if (_this.state === REJECTED) {
	raiseUnhandledPromiseRejectionException(_this.value, _this);
	}
	}
	};

	var reject = function reject(reason, bypassKey) {
	if (_this.settled && bypassKey !== secret) {
	return;
	}

	defineProperty(_this, "settled", true);
	defineProperty(_this, "value", reason);
	defineProperty(_this, "state", REJECTED);
	schedule(_this.observers.map(function (observer) {
	return {
	handler: observer.onreject,
	value: _this.value
	};
	}));
	raiseUnhandledPromiseRejectionException(_this.value, _this);
	};

	try {
	executor(resolve, reject);
	} catch (error) {
	reject(error);
	}
	}

	_createClass(Promifill, [{
	key: "then",
	value: function then(onfulfill, onreject) {
	var _this2 = this;

	var chainedPromise = new this.constructor(function (resolve, reject) {
	var internalOnfulfill = function internalOnfulfill(value) {
	try {
	resolve(typeof onfulfill == "function" ? onfulfill(value) : value);
	} catch (error) {
	reject(error);
	}
	};

	var internalOnreject = function internalOnreject(reason) {
	try {
	if (typeof onreject == "function") {
	resolve(onreject(reason));
	} else {
	reject(reason);
	}
	} catch (error) {
	reject(error);
	}
	};

	if (_this2.state === PENDING) {
	_this2.observers.push({
	onfulfill: internalOnfulfill,
	onreject: internalOnreject
	});
	} else {
	schedule([{
	handler: _this2.state === FULFILLED ? internalOnfulfill : internalOnreject,
	value: _this2.value
	}]);
	}
	});
	this.chain.push(chainedPromise);
	return chainedPromise;
	}
	}, {
	key: "catch",
	value: function _catch(onreject) {
	return this.then(null, onreject);
	}
	}, {
	key: "finally",
	value: function _finally(oncomplete) {
	var _this3 = this;

	var chainedPromise = new this.constructor(function (resolve, reject) {
	var internalOncomplete = function internalOncomplete() {
	try {
	oncomplete();

	if (_this3.state === FULFILLED) {
	resolve(_this3.value);
	} else {
	reject(_this3.value);
	}
	} catch (error) {
	reject(error);
	}
	};

	if (_this3.state === PENDING) {
	_this3.observers.push({
	onfulfill: internalOncomplete,
	onreject: internalOncomplete
	});
	} else {
	schedule([{
	handler: internalOncomplete
	}]);
	}
	});
	this.chain.push(chainedPromise);
	return chainedPromise;
	}
	}], [{
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	value: function resolve(value) {
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	key: "reject",
	value: function reject(reason) {
	return new Promifill(function (_, reject) {
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	}, {
	key: "all",
	value: function all(iterable) {
	return new Promifill(function (resolve, reject) {
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	if (isEmptyIterable(iterable)) {
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	var add = function add(value, index) {
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	if (values.filter(function () {
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	var _iterator = _createForOfIteratorHelper(iterable),
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	try {
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	}, {
	key: "race",
	value: function race(iterable) {
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	if (isEmptyIterable(iterable)) {
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	var _iterator2 = _createForOfIteratorHelper(iterable),
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	try {
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	} catch (err) {
	_iterator2.e(err);
	} finally {
	_iterator2.f();
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	}
	}]);

	return Promifill;
	}();

	var defineProperty = function defineProperty(obj, propName, propValue) {
	Object.defineProperty(obj, propName, {
	value: propValue
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	};

	var defer = function defer(handler) {
	return function () {
	for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
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	setTimeout.apply(void 0, [handler, 0].concat(args));
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	var thrower = function thrower(error) {
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	var raiseUnhandledPromiseRejectionException = defer(function (error, promise) {
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	var MutationObserverStrategy = /#__PURE__/function () {
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	var observer = new MutationObserver(handler);
	var node = this.node = document.createTextNode("");
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	_createClass(MutationObserverStrategy, [{
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	var NextTickStrategy = /#__PURE__/function () {
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	this.scheduleNextTick = function () {
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	return NextTickStrategy;
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	var BetterThanNothingStrategy = /#__PURE__/function () {
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	_createClass(BetterThanNothingStrategy, [{
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	value: function trigger() {
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	return BetterThanNothingStrategy;
	}();

	var getStrategy = function getStrategy() {
	if (typeof window != "undefined" && typeof window.MutationObserver == "function") {
	return MutationObserverStrategy;
	}

	if (typeof global != "undefined" && typeof process != "undefined" && typeof process.nextTick == "function") {
	return NextTickStrategy;
	}

	return BetterThanNothingStrategy;
	};

	var schedule = function () {
	var microtasks = [];

	var run = function run() {
	var handler, value;

	while (microtasks.length > 0 && (_microtasks$shift = microtasks.shift(), handler = _microtasks$shift.handler, value = _microtasks$shift.value, _microtasks$shift)) {
	var _microtasks$shift;

	handler(value);
	}
	};

	var Strategy = getStrategy();
	var ctrl = new Strategy(run);
	return function (observers) {
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	return;
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	microtasks = microtasks.concat(observers);
	observers.length = 0;
	ctrl.trigger();
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	var isIterable = function isIterable(subject) {
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	};

	var validateIterable = function validateIterable(subject) {
	if (isIterable(subject)) {
	return;
	}

	throw new TypeError("Cannot read property 'Symbol(Symbol.iterator)' of ".concat(Object.prototype.toString.call(subject), "."));
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	var isEmptyIterable = function isEmptyIterable(subject) {
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