cancelable-promise/umd/CancelablePromise.js

A simple cancelable promise

function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }

(function (global, factory) {
  if (typeof define === "function" && define.amd) {
    define(["exports"], factory);
  } else if (typeof exports !== "undefined") {
    factory(exports);
  } else {
    var mod = {
      exports: {}
    };
    factory(mod.exports);
    global.CancelablePromise = mod.exports;
  }
})(typeof globalThis !== "undefined" ? globalThis : typeof self !== "undefined" ? self : this, function (_exports) {
  "use strict";

  Object.defineProperty(_exports, "__esModule", {
    value: true
  });
  _exports.CancelablePromise = void 0;
  _exports.cancelable = cancelable;
  _exports.default = void 0;
  _exports.isCancelablePromise = isCancelablePromise;

  function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); Object.defineProperty(subClass, "prototype", { writable: false }); if (superClass) _setPrototypeOf(subClass, superClass); }

  function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

  function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }

  function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } else if (call !== void 0) { throw new TypeError("Derived constructors may only return object or undefined"); } return _assertThisInitialized(self); }

  function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

  function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }

  function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

  function _createForOfIteratorHelper(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (!it) { 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 = it.call(o); }, 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); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }

  function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

  function _classPrivateFieldInitSpec(obj, privateMap, value) { _checkPrivateRedeclaration(obj, privateMap); privateMap.set(obj, value); }

  function _checkPrivateRedeclaration(obj, privateCollection) { if (privateCollection.has(obj)) { throw new TypeError("Cannot initialize the same private elements twice on an object"); } }

  function _classPrivateFieldGet(receiver, privateMap) { var descriptor = _classExtractFieldDescriptor(receiver, privateMap, "get"); return _classApplyDescriptorGet(receiver, descriptor); }

  function _classApplyDescriptorGet(receiver, descriptor) { if (descriptor.get) { return descriptor.get.call(receiver); } return descriptor.value; }

  function _classPrivateFieldSet(receiver, privateMap, value) { var descriptor = _classExtractFieldDescriptor(receiver, privateMap, "set"); _classApplyDescriptorSet(receiver, descriptor, value); return value; }

  function _classExtractFieldDescriptor(receiver, privateMap, action) { if (!privateMap.has(receiver)) { throw new TypeError("attempted to " + action + " private field on non-instance"); } return privateMap.get(receiver); }

  function _classApplyDescriptorSet(receiver, descriptor, value) { if (descriptor.set) { descriptor.set.call(receiver, value); } else { if (!descriptor.writable) { throw new TypeError("attempted to set read only private field"); } descriptor.value = value; } }

  var toStringTag = typeof Symbol !== 'undefined' ? Symbol.toStringTag : '@@toStringTag';

  var _internals = /*#__PURE__*/new WeakMap();

  var _promise = /*#__PURE__*/new WeakMap();

  var CancelablePromiseInternal = /*#__PURE__*/function () {
    function CancelablePromiseInternal(_ref) {
      var _ref$executor = _ref.executor,
          executor = _ref$executor === void 0 ? function () {} : _ref$executor,
          _ref$internals = _ref.internals,
          internals = _ref$internals === void 0 ? defaultInternals() : _ref$internals,
          _ref$promise = _ref.promise,
          promise = _ref$promise === void 0 ? new Promise(function (resolve, reject) {
        return executor(resolve, reject, function (onCancel) {
          internals.onCancelList.push(onCancel);
        });
      }) : _ref$promise;

      _classCallCheck(this, CancelablePromiseInternal);

      _classPrivateFieldInitSpec(this, _internals, {
        writable: true,
        value: void 0
      });

      _classPrivateFieldInitSpec(this, _promise, {
        writable: true,
        value: void 0
      });

      _defineProperty(this, toStringTag, 'CancelablePromise');

      this.cancel = this.cancel.bind(this);

      _classPrivateFieldSet(this, _internals, internals);

      _classPrivateFieldSet(this, _promise, promise || new Promise(function (resolve, reject) {
        return executor(resolve, reject, function (onCancel) {
          internals.onCancelList.push(onCancel);
        });
      }));
    }

    _createClass(CancelablePromiseInternal, [{
      key: "then",
      value: function then(onfulfilled, onrejected) {
        return makeCancelable(_classPrivateFieldGet(this, _promise).then(createCallback(onfulfilled, _classPrivateFieldGet(this, _internals)), createCallback(onrejected, _classPrivateFieldGet(this, _internals))), _classPrivateFieldGet(this, _internals));
      }
    }, {
      key: "catch",
      value: function _catch(onrejected) {
        return makeCancelable(_classPrivateFieldGet(this, _promise).catch(createCallback(onrejected, _classPrivateFieldGet(this, _internals))), _classPrivateFieldGet(this, _internals));
      }
    }, {
      key: "finally",
      value: function _finally(onfinally, runWhenCanceled) {
        var _this = this;

        if (runWhenCanceled) {
          _classPrivateFieldGet(this, _internals).onCancelList.push(onfinally);
        }

        return makeCancelable(_classPrivateFieldGet(this, _promise).finally(createCallback(function () {
          if (onfinally) {
            if (runWhenCanceled) {
              _classPrivateFieldGet(_this, _internals).onCancelList = _classPrivateFieldGet(_this, _internals).onCancelList.filter(function (callback) {
                return callback !== onfinally;
              });
            }

            return onfinally();
          }
        }, _classPrivateFieldGet(this, _internals))), _classPrivateFieldGet(this, _internals));
      }
    }, {
      key: "cancel",
      value: function cancel() {
        _classPrivateFieldGet(this, _internals).isCanceled = true;

        var callbacks = _classPrivateFieldGet(this, _internals).onCancelList;

        _classPrivateFieldGet(this, _internals).onCancelList = [];

        var _iterator = _createForOfIteratorHelper(callbacks),
            _step;

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

            if (typeof callback === 'function') {
              try {
                callback();
              } catch (err) {
                console.error(err);
              }
            }
          }
        } catch (err) {
          _iterator.e(err);
        } finally {
          _iterator.f();
        }
      }
    }, {
      key: "isCanceled",
      value: function isCanceled() {
        return _classPrivateFieldGet(this, _internals).isCanceled === true;
      }
    }]);

    return CancelablePromiseInternal;
  }();

  var CancelablePromise = /*#__PURE__*/function (_CancelablePromiseInt) {
    _inherits(CancelablePromise, _CancelablePromiseInt);

    var _super = _createSuper(CancelablePromise);

    function CancelablePromise(executor) {
      _classCallCheck(this, CancelablePromise);

      return _super.call(this, {
        executor: executor
      });
    }

    return _createClass(CancelablePromise);
  }(CancelablePromiseInternal);

  _exports.CancelablePromise = CancelablePromise;

  _defineProperty(CancelablePromise, "all", function all(iterable) {
    return makeAllCancelable(iterable, Promise.all(iterable));
  });

  _defineProperty(CancelablePromise, "allSettled", function allSettled(iterable) {
    return makeAllCancelable(iterable, Promise.allSettled(iterable));
  });

  _defineProperty(CancelablePromise, "any", function any(iterable) {
    return makeAllCancelable(iterable, Promise.any(iterable));
  });

  _defineProperty(CancelablePromise, "race", function race(iterable) {
    return makeAllCancelable(iterable, Promise.race(iterable));
  });

  _defineProperty(CancelablePromise, "resolve", function resolve(value) {
    return cancelable(Promise.resolve(value));
  });

  _defineProperty(CancelablePromise, "reject", function reject(reason) {
    return cancelable(Promise.reject(reason));
  });

  _defineProperty(CancelablePromise, "isCancelable", isCancelablePromise);

  var _default = CancelablePromise;
  _exports.default = _default;

  function cancelable(promise) {
    return makeCancelable(promise, defaultInternals());
  }

  function isCancelablePromise(promise) {
    return promise instanceof CancelablePromise || promise instanceof CancelablePromiseInternal;
  }

  function createCallback(onResult, internals) {
    if (onResult) {
      return function (arg) {
        if (!internals.isCanceled) {
          var result = onResult(arg);

          if (isCancelablePromise(result)) {
            internals.onCancelList.push(result.cancel);
          }

          return result;
        }

        return arg;
      };
    }
  }

  function makeCancelable(promise, internals) {
    return new CancelablePromiseInternal({
      internals: internals,
      promise: promise
    });
  }

  function makeAllCancelable(iterable, promise) {
    var internals = defaultInternals();
    internals.onCancelList.push(function () {
      var _iterator2 = _createForOfIteratorHelper(iterable),
          _step2;

      try {
        for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
          var resolvable = _step2.value;

          if (isCancelablePromise(resolvable)) {
            resolvable.cancel();
          }
        }
      } catch (err) {
        _iterator2.e(err);
      } finally {
        _iterator2.f();
      }
    });
    return new CancelablePromiseInternal({
      internals: internals,
      promise: promise
    });
  }

  function defaultInternals() {
    return {
      isCanceled: false,
      onCancelList: []
    };
  }
});
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