hunk.code_window: {
     "name": "rxjs/testing",
     "typings": "./index.d.ts",
     "main": "./index.js",
     "module": "../_esm5/testing/index.js",
     "es2015": "../_esm2015/testing/index.js"
   }
hunk.labels: keep keep keep keep keep replace keep
hunk.after_edit:   "es2015": "../_esm2015/testing/index.js",
     "sideEffects": false
  
hunk.file_path: src/testing/package.json
hunk.type: replace
file: import { Observable } from '../../Observable';
  
  /**
   * @param func
   * @return {Observable<R>}
   * @method let
   * @owner Observable
   */
  export function letProto<T, R>(this: Observable<T>, func: (selector: Observable<T>) => Observable<R>): Observable<R> {
    return func(this);
  }
  