40 lines
1.6 KiB
JavaScript
Executable file
40 lines
1.6 KiB
JavaScript
Executable file
'use strict';
|
|
var $ = require('../internals/export');
|
|
var IS_PURE = require('../internals/is-pure');
|
|
var NativePromise = require('../internals/native-promise-constructor');
|
|
var fails = require('../internals/fails');
|
|
var getBuiltIn = require('../internals/get-built-in');
|
|
var speciesConstructor = require('../internals/species-constructor');
|
|
var promiseResolve = require('../internals/promise-resolve');
|
|
var redefine = require('../internals/redefine');
|
|
|
|
// Safari bug https://bugs.webkit.org/show_bug.cgi?id=200829
|
|
var NON_GENERIC = !!NativePromise && fails(function () {
|
|
NativePromise.prototype['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 = typeof onFinally == 'function';
|
|
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 && typeof NativePromise == 'function') {
|
|
var method = getBuiltIn('Promise').prototype['finally'];
|
|
if (NativePromise.prototype['finally'] !== method) {
|
|
redefine(NativePromise.prototype, 'finally', method, { unsafe: true });
|
|
}
|
|
}
|