angular-cn/packages/zone.js/test/rxjs/rxjs.util.ts

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/**
* @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
*/
export function supportFeature(Observable: any, method: string) {
const func = function() {
return !!Observable.prototype[method];
};
(func as any).message = `Observable.${method} not support`;
}