Method flush

packages/zone.js/lib/zone-spec/fake-async-test.ts:305–311

(limit = 20, flushPeriodic = false, doTick?: (elapsed: number) => void)

  }

  flush(limit = 20, flushPeriodic = false, doTick?: (elapsed: number) => void): number {
    if (flushPeriodic) {
      return this.flushPeriodic(doTick);
    } else {
      return this.flushNonPeriodic(limit, doTick);
    }
  }

  private flushPeriodic(doTick?: (elapsed: number) => void): number {
    if (this._schedulerQueue.length === 0) {