react-monaco-editor/example/node_modules/rxjs/src/add/operator/bufferCount.ts

Monaco Editor for React

import { Observable } from '../../Observable';
import { bufferCount } from '../../operator/bufferCount';

Observable.prototype.bufferCount = bufferCount;

declare module '../../Observable' {
  interface Observable<T> {
    bufferCount: typeof bufferCount;
  }
}