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398 lines
14 KiB
398 lines
14 KiB
'use strict';
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var $ = require('../internals/export');
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var IS_PURE = require('../internals/is-pure');
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var global = require('../internals/global');
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var getBuiltIn = require('../internals/get-built-in');
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var call = require('../internals/function-call');
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var NativePromise = require('../internals/native-promise-constructor');
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var redefine = require('../internals/redefine');
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var redefineAll = require('../internals/redefine-all');
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var setPrototypeOf = require('../internals/object-set-prototype-of');
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var setToStringTag = require('../internals/set-to-string-tag');
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var setSpecies = require('../internals/set-species');
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var aCallable = require('../internals/a-callable');
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var isCallable = require('../internals/is-callable');
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var isObject = require('../internals/is-object');
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var anInstance = require('../internals/an-instance');
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var inspectSource = require('../internals/inspect-source');
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var iterate = require('../internals/iterate');
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var checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');
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var speciesConstructor = require('../internals/species-constructor');
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var task = require('../internals/task').set;
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var microtask = require('../internals/microtask');
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var promiseResolve = require('../internals/promise-resolve');
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var hostReportErrors = require('../internals/host-report-errors');
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var newPromiseCapabilityModule = require('../internals/new-promise-capability');
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var perform = require('../internals/perform');
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var InternalStateModule = require('../internals/internal-state');
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var isForced = require('../internals/is-forced');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var IS_BROWSER = require('../internals/engine-is-browser');
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var IS_NODE = require('../internals/engine-is-node');
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var V8_VERSION = require('../internals/engine-v8-version');
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var SPECIES = wellKnownSymbol('species');
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var PROMISE = 'Promise';
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var getInternalState = InternalStateModule.get;
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var setInternalState = InternalStateModule.set;
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var getInternalPromiseState = InternalStateModule.getterFor(PROMISE);
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var NativePromisePrototype = NativePromise && NativePromise.prototype;
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var PromiseConstructor = NativePromise;
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var PromisePrototype = NativePromisePrototype;
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var TypeError = global.TypeError;
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var document = global.document;
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var process = global.process;
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var newPromiseCapability = newPromiseCapabilityModule.f;
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var newGenericPromiseCapability = newPromiseCapability;
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var DISPATCH_EVENT = !!(document && document.createEvent && global.dispatchEvent);
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var NATIVE_REJECTION_EVENT = isCallable(global.PromiseRejectionEvent);
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var UNHANDLED_REJECTION = 'unhandledrejection';
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var REJECTION_HANDLED = 'rejectionhandled';
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var PENDING = 0;
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var FULFILLED = 1;
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var REJECTED = 2;
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var HANDLED = 1;
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var UNHANDLED = 2;
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var SUBCLASSING = false;
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var Internal, OwnPromiseCapability, PromiseWrapper, nativeThen;
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var FORCED = isForced(PROMISE, function () {
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var PROMISE_CONSTRUCTOR_SOURCE = inspectSource(PromiseConstructor);
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var GLOBAL_CORE_JS_PROMISE = PROMISE_CONSTRUCTOR_SOURCE !== String(PromiseConstructor);
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// V8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables
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// https://bugs.chromium.org/p/chromium/issues/detail?id=830565
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// We can't detect it synchronously, so just check versions
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if (!GLOBAL_CORE_JS_PROMISE && V8_VERSION === 66) return true;
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// We need Promise#finally in the pure version for preventing prototype pollution
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if (IS_PURE && !PromisePrototype['finally']) return true;
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// We can't use @@species feature detection in V8 since it causes
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// deoptimization and performance degradation
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// https://github.com/zloirock/core-js/issues/679
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if (V8_VERSION >= 51 && /native code/.test(PROMISE_CONSTRUCTOR_SOURCE)) return false;
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// Detect correctness of subclassing with @@species support
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var promise = new PromiseConstructor(function (resolve) { resolve(1); });
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var FakePromise = function (exec) {
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exec(function () { /* empty */ }, function () { /* empty */ });
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};
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var constructor = promise.constructor = {};
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constructor[SPECIES] = FakePromise;
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SUBCLASSING = promise.then(function () { /* empty */ }) instanceof FakePromise;
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if (!SUBCLASSING) return true;
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// Unhandled rejections tracking support, NodeJS Promise without it fails @@species test
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return !GLOBAL_CORE_JS_PROMISE && IS_BROWSER && !NATIVE_REJECTION_EVENT;
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});
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var INCORRECT_ITERATION = FORCED || !checkCorrectnessOfIteration(function (iterable) {
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PromiseConstructor.all(iterable)['catch'](function () { /* empty */ });
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});
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// helpers
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var isThenable = function (it) {
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var then;
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return isObject(it) && isCallable(then = it.then) ? then : false;
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};
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var notify = function (state, isReject) {
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if (state.notified) return;
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state.notified = true;
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var chain = state.reactions;
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microtask(function () {
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var value = state.value;
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var ok = state.state == FULFILLED;
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var index = 0;
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// variable length - can't use forEach
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while (chain.length > index) {
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var reaction = chain[index++];
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var handler = ok ? reaction.ok : reaction.fail;
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var resolve = reaction.resolve;
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var reject = reaction.reject;
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var domain = reaction.domain;
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var result, then, exited;
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try {
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if (handler) {
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if (!ok) {
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if (state.rejection === UNHANDLED) onHandleUnhandled(state);
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state.rejection = HANDLED;
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}
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if (handler === true) result = value;
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else {
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if (domain) domain.enter();
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result = handler(value); // can throw
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if (domain) {
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domain.exit();
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exited = true;
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}
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}
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if (result === reaction.promise) {
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reject(TypeError('Promise-chain cycle'));
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} else if (then = isThenable(result)) {
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call(then, result, resolve, reject);
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} else resolve(result);
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} else reject(value);
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} catch (error) {
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if (domain && !exited) domain.exit();
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reject(error);
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}
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}
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state.reactions = [];
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state.notified = false;
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if (isReject && !state.rejection) onUnhandled(state);
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});
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};
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var dispatchEvent = function (name, promise, reason) {
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var event, handler;
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if (DISPATCH_EVENT) {
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event = document.createEvent('Event');
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event.promise = promise;
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event.reason = reason;
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event.initEvent(name, false, true);
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global.dispatchEvent(event);
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} else event = { promise: promise, reason: reason };
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if (!NATIVE_REJECTION_EVENT && (handler = global['on' + name])) handler(event);
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else if (name === UNHANDLED_REJECTION) hostReportErrors('Unhandled promise rejection', reason);
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};
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var onUnhandled = function (state) {
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call(task, global, function () {
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var promise = state.facade;
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var value = state.value;
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var IS_UNHANDLED = isUnhandled(state);
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var result;
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if (IS_UNHANDLED) {
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result = perform(function () {
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if (IS_NODE) {
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process.emit('unhandledRejection', value, promise);
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} else dispatchEvent(UNHANDLED_REJECTION, promise, value);
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});
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// Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should
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state.rejection = IS_NODE || isUnhandled(state) ? UNHANDLED : HANDLED;
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if (result.error) throw result.value;
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}
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});
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};
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var isUnhandled = function (state) {
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return state.rejection !== HANDLED && !state.parent;
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};
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var onHandleUnhandled = function (state) {
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call(task, global, function () {
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var promise = state.facade;
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if (IS_NODE) {
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process.emit('rejectionHandled', promise);
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} else dispatchEvent(REJECTION_HANDLED, promise, state.value);
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});
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};
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var bind = function (fn, state, unwrap) {
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return function (value) {
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fn(state, value, unwrap);
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};
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};
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var internalReject = function (state, value, unwrap) {
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if (state.done) return;
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state.done = true;
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if (unwrap) state = unwrap;
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state.value = value;
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state.state = REJECTED;
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notify(state, true);
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};
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var internalResolve = function (state, value, unwrap) {
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if (state.done) return;
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state.done = true;
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if (unwrap) state = unwrap;
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try {
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if (state.facade === value) throw TypeError("Promise can't be resolved itself");
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var then = isThenable(value);
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if (then) {
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microtask(function () {
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var wrapper = { done: false };
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try {
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call(then, value,
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bind(internalResolve, wrapper, state),
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bind(internalReject, wrapper, state)
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);
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} catch (error) {
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internalReject(wrapper, error, state);
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}
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});
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} else {
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state.value = value;
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state.state = FULFILLED;
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notify(state, false);
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}
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} catch (error) {
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internalReject({ done: false }, error, state);
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}
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};
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// constructor polyfill
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if (FORCED) {
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// 25.4.3.1 Promise(executor)
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PromiseConstructor = function Promise(executor) {
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anInstance(this, PromisePrototype);
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aCallable(executor);
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call(Internal, this);
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var state = getInternalState(this);
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try {
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executor(bind(internalResolve, state), bind(internalReject, state));
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} catch (error) {
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internalReject(state, error);
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}
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};
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PromisePrototype = PromiseConstructor.prototype;
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// eslint-disable-next-line no-unused-vars -- required for `.length`
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Internal = function Promise(executor) {
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setInternalState(this, {
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type: PROMISE,
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done: false,
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notified: false,
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parent: false,
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reactions: [],
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rejection: false,
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state: PENDING,
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value: undefined
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});
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};
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Internal.prototype = redefineAll(PromisePrototype, {
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// `Promise.prototype.then` method
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// https://tc39.es/ecma262/#sec-promise.prototype.then
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then: function then(onFulfilled, onRejected) {
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var state = getInternalPromiseState(this);
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var reactions = state.reactions;
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var reaction = newPromiseCapability(speciesConstructor(this, PromiseConstructor));
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reaction.ok = isCallable(onFulfilled) ? onFulfilled : true;
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reaction.fail = isCallable(onRejected) && onRejected;
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reaction.domain = IS_NODE ? process.domain : undefined;
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state.parent = true;
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reactions[reactions.length] = reaction;
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if (state.state != PENDING) notify(state, false);
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return reaction.promise;
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},
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// `Promise.prototype.catch` method
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// https://tc39.es/ecma262/#sec-promise.prototype.catch
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'catch': function (onRejected) {
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return this.then(undefined, onRejected);
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}
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});
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OwnPromiseCapability = function () {
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var promise = new Internal();
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var state = getInternalState(promise);
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this.promise = promise;
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this.resolve = bind(internalResolve, state);
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this.reject = bind(internalReject, state);
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};
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newPromiseCapabilityModule.f = newPromiseCapability = function (C) {
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return C === PromiseConstructor || C === PromiseWrapper
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? new OwnPromiseCapability(C)
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: newGenericPromiseCapability(C);
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};
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if (!IS_PURE && isCallable(NativePromise) && NativePromisePrototype !== Object.prototype) {
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nativeThen = NativePromisePrototype.then;
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if (!SUBCLASSING) {
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// make `Promise#then` return a polyfilled `Promise` for native promise-based APIs
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redefine(NativePromisePrototype, 'then', function then(onFulfilled, onRejected) {
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var that = this;
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return new PromiseConstructor(function (resolve, reject) {
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call(nativeThen, that, resolve, reject);
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}).then(onFulfilled, onRejected);
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// https://github.com/zloirock/core-js/issues/640
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}, { unsafe: true });
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// makes sure that native promise-based APIs `Promise#catch` properly works with patched `Promise#then`
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redefine(NativePromisePrototype, 'catch', PromisePrototype['catch'], { unsafe: true });
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}
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// make `.constructor === Promise` work for native promise-based APIs
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try {
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delete NativePromisePrototype.constructor;
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} catch (error) { /* empty */ }
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// make `instanceof Promise` work for native promise-based APIs
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if (setPrototypeOf) {
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setPrototypeOf(NativePromisePrototype, PromisePrototype);
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}
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}
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}
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$({ global: true, wrap: true, forced: FORCED }, {
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Promise: PromiseConstructor
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});
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setToStringTag(PromiseConstructor, PROMISE, false, true);
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setSpecies(PROMISE);
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PromiseWrapper = getBuiltIn(PROMISE);
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// statics
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$({ target: PROMISE, stat: true, forced: FORCED }, {
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// `Promise.reject` method
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// https://tc39.es/ecma262/#sec-promise.reject
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reject: function reject(r) {
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var capability = newPromiseCapability(this);
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call(capability.reject, undefined, r);
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return capability.promise;
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}
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});
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$({ target: PROMISE, stat: true, forced: IS_PURE || FORCED }, {
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// `Promise.resolve` method
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// https://tc39.es/ecma262/#sec-promise.resolve
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resolve: function resolve(x) {
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return promiseResolve(IS_PURE && this === PromiseWrapper ? PromiseConstructor : this, x);
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}
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});
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$({ target: PROMISE, stat: true, forced: INCORRECT_ITERATION }, {
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// `Promise.all` method
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// https://tc39.es/ecma262/#sec-promise.all
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all: function all(iterable) {
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var C = this;
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var capability = newPromiseCapability(C);
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var resolve = capability.resolve;
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var reject = capability.reject;
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var result = perform(function () {
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var $promiseResolve = aCallable(C.resolve);
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var values = [];
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var counter = 0;
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var remaining = 1;
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iterate(iterable, function (promise) {
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var index = counter++;
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var alreadyCalled = false;
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remaining++;
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call($promiseResolve, C, promise).then(function (value) {
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if (alreadyCalled) return;
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alreadyCalled = true;
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values[index] = value;
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--remaining || resolve(values);
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}, reject);
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});
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--remaining || resolve(values);
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});
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if (result.error) reject(result.value);
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return capability.promise;
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},
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// `Promise.race` method
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// https://tc39.es/ecma262/#sec-promise.race
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race: function race(iterable) {
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var C = this;
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var capability = newPromiseCapability(C);
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var reject = capability.reject;
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var result = perform(function () {
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var $promiseResolve = aCallable(C.resolve);
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iterate(iterable, function (promise) {
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call($promiseResolve, C, promise).then(capability.resolve, reject);
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});
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});
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if (result.error) reject(result.value);
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return capability.promise;
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}
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});
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