proxy.ts
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {global} from '../util/global';
/**
* Used to inform TS about the `Proxy` class existing globally.
*/
interface GlobalWithProxy {
Proxy: typeof Proxy;
}
/**
* Creates an instance of a `Proxy` and creates with an empty target object and binds it to the
* provided handler.
*
* The reason why this function exists is because IE doesn't support
* the `Proxy` class. For this reason an error must be thrown.
*/
export function createProxy(handler: ProxyHandler<any>): {} {
const g = global as any as GlobalWithProxy;
if (!g.Proxy) {
throw new Error('Proxy is not supported in this browser');
}
return new g.Proxy({}, handler);
}