es.promise.catch.js
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es.promise.catch.js
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	'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 });
	}
	}