Function cacheBust

packages/service-worker/worker/src/assets.ts:554–556

* Construct a cache-busting URL for a given URL.

(url: string)

   * Construct a cache-busting URL for a given URL.
   */
  private cacheBust(url: string): string {
    return url + (url.indexOf('?') === -1 ? '?' : '&') + 'ngsw-cache-bust=' + Math.random();
  }

  protected async safeFetch(req: Request): Promise<Response> {
    try {