1 | 'use strict';
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2 | var global = require('../internals/global');
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3 | var NativePromiseConstructor = require('../internals/promise-native-constructor');
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4 | var isCallable = require('../internals/is-callable');
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5 | var isForced = require('../internals/is-forced');
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6 | var inspectSource = require('../internals/inspect-source');
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7 | var wellKnownSymbol = require('../internals/well-known-symbol');
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8 | var IS_BROWSER = require('../internals/engine-is-browser');
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9 | var IS_DENO = require('../internals/engine-is-deno');
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10 | var IS_PURE = require('../internals/is-pure');
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11 | var V8_VERSION = require('../internals/engine-v8-version');
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12 |
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13 | var NativePromisePrototype = NativePromiseConstructor && NativePromiseConstructor.prototype;
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14 | var SPECIES = wellKnownSymbol('species');
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15 | var SUBCLASSING = false;
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16 | var NATIVE_PROMISE_REJECTION_EVENT = isCallable(global.PromiseRejectionEvent);
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17 |
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18 | var FORCED_PROMISE_CONSTRUCTOR = isForced('Promise', function () {
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19 | var PROMISE_CONSTRUCTOR_SOURCE = inspectSource(NativePromiseConstructor);
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20 | var GLOBAL_CORE_JS_PROMISE = PROMISE_CONSTRUCTOR_SOURCE !== String(NativePromiseConstructor);
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21 |
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22 |
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23 |
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24 | if (!GLOBAL_CORE_JS_PROMISE && V8_VERSION === 66) return true;
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25 |
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26 | if (IS_PURE && !(NativePromisePrototype['catch'] && NativePromisePrototype['finally'])) return true;
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27 |
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28 |
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29 |
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30 | if (!V8_VERSION || V8_VERSION < 51 || !/native code/.test(PROMISE_CONSTRUCTOR_SOURCE)) {
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31 |
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32 | var promise = new NativePromiseConstructor(function (resolve) { resolve(1); });
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33 | var FakePromise = function (exec) {
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34 | exec(function () { }, function () { });
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35 | };
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36 | var constructor = promise.constructor = {};
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37 | constructor[SPECIES] = FakePromise;
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38 | SUBCLASSING = promise.then(function () { }) instanceof FakePromise;
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39 | if (!SUBCLASSING) return true;
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40 |
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41 | } return !GLOBAL_CORE_JS_PROMISE && (IS_BROWSER || IS_DENO) && !NATIVE_PROMISE_REJECTION_EVENT;
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42 | });
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43 |
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44 | module.exports = {
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45 | CONSTRUCTOR: FORCED_PROMISE_CONSTRUCTOR,
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46 | REJECTION_EVENT: NATIVE_PROMISE_REJECTION_EVENT,
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47 | SUBCLASSING: SUBCLASSING
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48 | };
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