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- 'use strict';
- var $ = require('../internals/export');
- var IS_PURE = require('../internals/is-pure');
- var NativePromiseConstructor = require('../internals/promise-native-constructor');
- var fails = require('../internals/fails');
- var getBuiltIn = require('../internals/get-built-in');
- var isCallable = require('../internals/is-callable');
- var speciesConstructor = require('../internals/species-constructor');
- var promiseResolve = require('../internals/promise-resolve');
- var redefine = require('../internals/redefine');
- var NativePromisePrototype = NativePromiseConstructor && NativePromiseConstructor.prototype;
- // Safari bug https://bugs.webkit.org/show_bug.cgi?id=200829
- var NON_GENERIC = !!NativePromiseConstructor && fails(function () {
- // eslint-disable-next-line unicorn/no-thenable -- required for testing
- NativePromisePrototype['finally'].call({ then: function () { /* empty */ } }, function () { /* empty */ });
- });
- // `Promise.prototype.finally` method
- // https://tc39.es/ecma262/#sec-promise.prototype.finally
- $({ target: 'Promise', proto: true, real: true, forced: NON_GENERIC }, {
- 'finally': function (onFinally) {
- var C = speciesConstructor(this, getBuiltIn('Promise'));
- var isFunction = isCallable(onFinally);
- return this.then(
- isFunction ? function (x) {
- return promiseResolve(C, onFinally()).then(function () { return x; });
- } : onFinally,
- isFunction ? function (e) {
- return promiseResolve(C, onFinally()).then(function () { throw e; });
- } : onFinally
- );
- }
- });
- // makes sure that native promise-based APIs `Promise#finally` properly works with patched `Promise#then`
- if (!IS_PURE && isCallable(NativePromiseConstructor)) {
- var method = getBuiltIn('Promise').prototype['finally'];
- if (NativePromisePrototype['finally'] !== method) {
- redefine(NativePromisePrototype, 'finally', method, { unsafe: true });
- }
- }
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