Method checkForUpdate

packages/service-worker/src/update.ts:85–99

* Checks for an update and waits until the new version is downloaded from the server and ready * for activation. * * @returns a promise that * - resolves to `true` if a new version was found and is ready to be activated. * - resolves to `false` if no new version was found * - rejec

()

   * - rejects if any error occurs
   */
  checkForUpdate(): Promise<boolean> {
    if (!this.sw.isEnabled) {
      return Promise.reject(new Error(ERR_SW_NOT_SUPPORTED));
    }
    if (this.ongoingCheckForUpdate) {
      return this.ongoingCheckForUpdate;
    }
    const nonce = this.sw.generateNonce();
    this.ongoingCheckForUpdate = this.sw
      .postMessageWithOperation('CHECK_FOR_UPDATES', {nonce}, nonce)
      .finally(() => {
        this.ongoingCheckForUpdate = null;
      });
    return this.ongoingCheckForUpdate;
  }

  /**
   * Updates the current client (i.e. browser tab) to the latest version that is ready for