async onBeforeLaunchApp(event) {
    Object.assign(this.context, {
      isAppReady: false,
    });
  }
Hook that is called inside device.launchApp() before
the current app on the current device is relaunched.

@protected
@async
@param {Object} event - Launch app event object
@param {string} event.deviceId - Current deviceId
@param {string} event.bundleId - Current bundleId
@param {Object} event.launchArgs - Mutable key-value pairs of args before the launch
@return {Promise<void>} - when done