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2 years ago
'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 defineBuiltIn = require('../internals/define-built-in');
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) {
defineBuiltIn(NativePromisePrototype, 'finally', method, { unsafe: true });
}
}