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40 lines
1.6 KiB
JavaScript
40 lines
1.6 KiB
JavaScript
'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 NativePromise = require('../internals/native-promise-constructor');
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var fails = require('../internals/fails');
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var getBuiltIn = require('../internals/get-built-in');
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var speciesConstructor = require('../internals/species-constructor');
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var promiseResolve = require('../internals/promise-resolve');
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var redefine = require('../internals/redefine');
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// Safari bug https://bugs.webkit.org/show_bug.cgi?id=200829
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var NON_GENERIC = !!NativePromise && fails(function () {
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NativePromise.prototype['finally'].call({ then: function () { /* empty */ } }, function () { /* empty */ });
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});
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// `Promise.prototype.finally` method
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// https://tc39.es/ecma262/#sec-promise.prototype.finally
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$({ target: 'Promise', proto: true, real: true, forced: NON_GENERIC }, {
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'finally': function (onFinally) {
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var C = speciesConstructor(this, getBuiltIn('Promise'));
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var isFunction = typeof onFinally == 'function';
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return this.then(
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isFunction ? function (x) {
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return promiseResolve(C, onFinally()).then(function () { return x; });
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} : onFinally,
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isFunction ? function (e) {
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return promiseResolve(C, onFinally()).then(function () { throw e; });
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} : onFinally
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);
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}
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});
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// makes sure that native promise-based APIs `Promise#finally` properly works with patched `Promise#then`
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if (!IS_PURE && typeof NativePromise == 'function') {
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var method = getBuiltIn('Promise').prototype['finally'];
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if (NativePromise.prototype['finally'] !== method) {
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redefine(NativePromise.prototype, 'finally', method, { unsafe: true });
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}
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}
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