angular-cn/packages/zone.js/lib/browser/browser-util.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
*/
export function patchCallbacks(
api: _ZonePrivate, target: any, targetName: string, method: string, callbacks: string[]) {
const symbol = Zone.__symbol__(method);
if (target[symbol]) {
return;
}
const nativeDelegate = target[symbol] = target[method];
target[method] = function(name: any, opts: any, options?: any) {
if (opts && opts.prototype) {
callbacks.forEach(function(callback) {
const source = `${targetName}.${method}::` + callback;
const prototype = opts.prototype;
if (prototype.hasOwnProperty(callback)) {
const descriptor = api.ObjectGetOwnPropertyDescriptor(prototype, callback);
if (descriptor && descriptor.value) {
descriptor.value = api.wrapWithCurrentZone(descriptor.value, source);
api._redefineProperty(opts.prototype, callback, descriptor);
} else if (prototype[callback]) {
prototype[callback] = api.wrapWithCurrentZone(prototype[callback], source);
}
} else if (prototype[callback]) {
prototype[callback] = api.wrapWithCurrentZone(prototype[callback], source);
}
});
}
return nativeDelegate.call(target, name, opts, options);
};
api.attachOriginToPatched(target[method], nativeDelegate);
}