Method fetchLatestManifest

packages/service-worker/worker/src/driver.ts:931–946

(ignoreOfflineError = false)

  private async fetchLatestManifest(ignoreOfflineError?: false): Promise<Manifest>;
  private async fetchLatestManifest(ignoreOfflineError: true): Promise<Manifest | null>;
  private async fetchLatestManifest(ignoreOfflineError = false): Promise<Manifest | null> {
    const res = await this.safeFetch(
      this.adapter.newRequest('ngsw.json?ngsw-cache-bust=' + Math.random()),
    );
    if (!res.ok) {
      if (res.status === 404) {
        await this.deleteAllCaches();
        await this.scope.registration.unregister();
      } else if ((res.status === 503 || res.status === 504) && ignoreOfflineError) {
        return null;
      }
      throw new Error(`Manifest fetch failed! (status: ${res.status})`);
    }
    this.lastUpdateCheck = this.adapter.time;
    return res.json();
  }

  private async deleteAllCaches(): Promise<void> {
    const cacheNames = await this.adapter.caches.keys();