/
setprototypeof.js
60 lines (57 loc) · 1.69 KB
/
setprototypeof.js
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/*
* Copyright 2016 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @fileoverview
* @suppress {uselessCode}
*/
'require util/polyfill';
'require es6/reflect/reflect';
'require es6/util/setprototypeof';
$jscomp.polyfill(
'Reflect.setPrototypeOf',
/**
* These annotations are intended to match the signature of
* $jscomp.polyfill(). Being more specific makes the compiler unhappy.
* @suppress {reportUnknownTypes}
* @param {?*} orig
* @return {*}
*/
function(orig) {
if (orig) {
return orig;
} else if ($jscomp.setPrototypeOf) {
/** @const {!function(!Object,?Object):!Object} */
var setPrototypeOf = $jscomp.setPrototypeOf;
/**
* @param {!Object} target
* @param {?Object} proto
* @return {boolean}
*/
var polyfill = function(target, proto) {
try {
setPrototypeOf(target, proto);
return true;
} catch (e) {
return false;
}
};
return polyfill;
} else {
// it isn't possible to implement this method
return null;
}
},
'es6', 'es5');