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rOACCT/node_modules/core-js/internals/promise-constructor-detection.js
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promise-constructor-detection.js
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var global = require('../internals/global');
var NativePromiseConstructor = require('../internals/promise-native-constructor');
var isCallable = require('../internals/is-callable');
var isForced = require('../internals/is-forced');
var inspectSource = require('../internals/inspect-source');
var wellKnownSymbol = require('../internals/well-known-symbol');
var IS_BROWSER = require('../internals/engine-is-browser');
var IS_DENO = require('../internals/engine-is-deno');
var IS_PURE = require('../internals/is-pure');
var V8_VERSION = require('../internals/engine-v8-version');
var NativePromisePrototype = NativePromiseConstructor && NativePromiseConstructor.prototype;
var SPECIES = wellKnownSymbol('species');
var SUBCLASSING = false;
var NATIVE_PROMISE_REJECTION_EVENT = isCallable(global.PromiseRejectionEvent);
var FORCED_PROMISE_CONSTRUCTOR = isForced('Promise', function () {
var PROMISE_CONSTRUCTOR_SOURCE = inspectSource(NativePromiseConstructor);
var GLOBAL_CORE_JS_PROMISE = PROMISE_CONSTRUCTOR_SOURCE !== String(NativePromiseConstructor);
// 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 (!GLOBAL_CORE_JS_PROMISE && V8_VERSION === 66) return true;
// We need Promise#{ catch, finally } in the pure version for preventing prototype pollution
if (IS_PURE && !(NativePromisePrototype['catch'] && NativePromisePrototype['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 (!V8_VERSION || V8_VERSION < 51 || !/native code/.test(PROMISE_CONSTRUCTOR_SOURCE)) {
// Detect correctness of subclassing with @@species support
var promise = new NativePromiseConstructor(function (resolve) { resolve(1); });
var FakePromise = function (exec) {
exec(function () { /* empty */ }, function () { /* empty */ });
};
var constructor = promise.constructor = {};
constructor[SPECIES] = FakePromise;
SUBCLASSING = promise.then(function () { /* empty */ }) instanceof FakePromise;
if (!SUBCLASSING) return true;
// Unhandled rejections tracking support, NodeJS Promise without it fails @@species test
} return !GLOBAL_CORE_JS_PROMISE && (IS_BROWSER || IS_DENO) && !NATIVE_PROMISE_REJECTION_EVENT;
});
module.exports = {
CONSTRUCTOR: FORCED_PROMISE_CONSTRUCTOR,
REJECTION_EVENT: NATIVE_PROMISE_REJECTION_EVENT,
SUBCLASSING: SUBCLASSING
};
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