angular-cn/packages/zone.js/lib/browser/webapis-rtc-peer-connection.ts

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/**
* @license
* Copyright Google Inc. 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
*/
Zone.__load_patch('RTCPeerConnection', (global: any, Zone: ZoneType, api: _ZonePrivate) => {
const RTCPeerConnection = global['RTCPeerConnection'];
if (!RTCPeerConnection) {
return;
}
const addSymbol = api.symbol('addEventListener');
const removeSymbol = api.symbol('removeEventListener');
RTCPeerConnection.prototype.addEventListener = RTCPeerConnection.prototype[addSymbol];
RTCPeerConnection.prototype.removeEventListener = RTCPeerConnection.prototype[removeSymbol];
// RTCPeerConnection extends EventTarget, so we must clear the symbol
// to allow patch RTCPeerConnection.prototype.addEventListener again
RTCPeerConnection.prototype[addSymbol] = null;
RTCPeerConnection.prototype[removeSymbol] = null;
api.patchEventTarget(global, [RTCPeerConnection.prototype], {useG: false});
});