Method assertNotInProcess

packages/core/src/application.ts:266–271

* Assert there is no other operation is in progress, i.e., the state is not * `*ing`, such as `starting` or `stopping`. * * @param op - The operation name, such as 'boot', 'start', or 'stop'

(op: string)

   * @param op - The operation name, such as 'boot', 'start', or 'stop'
   */
  protected assertNotInProcess(op: string) {
    assert(
      !this._state.endsWith('ing'),
      `Cannot ${op} the application as it is ${this._state}.`,
    );
  }

  /**
   * Assert current state of the application to be one of the expected values