'use strict'; var $ = require('../internals/export'); var IS_PURE = require('../internals/is-pure'); var FORCED_PROMISE_CONSTRUCTOR = require('../internals/promise-constructor-detection').CONSTRUCTOR; var NativePromiseConstructor = require('../internals/promise-native-constructor'); var getBuiltIn = require('../internals/get-built-in'); var isCallable = require('../internals/is-callable'); var defineBuiltIn = require('../internals/define-built-in'); var NativePromisePrototype = NativePromiseConstructor && NativePromiseConstructor.prototype; // `Promise.prototype.catch` method // https://tc39.es/ecma262/#sec-promise.prototype.catch $({ target: 'Promise', proto: true, forced: FORCED_PROMISE_CONSTRUCTOR, real: true }, { 'catch': function (onRejected) { return this.then(undefined, onRejected); } }); // makes sure that native promise-based APIs `Promise#catch` properly works with patched `Promise#then` if (!IS_PURE && isCallable(NativePromiseConstructor)) { var method = getBuiltIn('Promise').prototype['catch']; if (NativePromisePrototype['catch'] !== method) { defineBuiltIn(NativePromisePrototype, 'catch', method, { unsafe: true }); } }