typescript source code of run-zone

import { Observable, OperatorFunction } from "rxjs";
import { NgZone } from "@angular/core";

export const noZoneRunner = (zone: NgZone) => <T>(
  source: Observable<T>
): Observable<T> => {
  return new Observable<T>(subscriber => {
    return zone.runOutsideAngular(() => {
      runInZone(zone)(source).subscribe(subscriber);
    });
  });
};

export function runOutsideZone<T>(zone: NgZone): OperatorFunction<T, T> {
  return source => {
    return new Observable(subscriber => {
      return source.subscribe(
        (value: T) => zone.runOutsideAngular(() => subscriber.next(value)),
        (e: any) => zone.runOutsideAngular(() => subscriber.error(e)),
        () => zone.runOutsideAngular(() => subscriber.complete())
      );
    });
  };
}

export function runInZone<T>(zone: NgZone): OperatorFunction<T, T> {
  return source => {
    return new Observable(subscriber => {
      return source.subscribe(
        (value: T) => zone.run(() => subscriber.next(value)),
        (e: any) => zone.run(() => subscriber.error(e)),
        () => zone.run(() => subscriber.complete())
      );
    });
  };
}