How to use the macaca-chromedriver.EVENT_READY function in macaca-chromedriver

this.chromedriver = new ChromeDriver(options);
    if (this.chromedriver.binPathReady) {
      logger.info('starting chromedriver service!');
      this.chromedriver.start({
        chromeOptions: {
          androidPackage: this.apkInfo.package,
          androidUseRunningApp: true,
          androidDeviceSerial: this.udid,
          androidProcess: this.apkInfo.androidProcess
        }
      });
    }
    this.chromedriver.on(ChromeDriver.BIN_READY, data => {
      logger.info(`chromedriver bin file ready: ${data}`);
    });
    this.chromedriver.on(ChromeDriver.EVENT_READY, data => {
      logger.info(`chromedriver ready with: ${JSON.stringify(data)}`);
      resolve('');
    });
    this.chromedriver.on(ChromeDriver.EVENT_ERROR, data => {
      logger.error(`chromedriver error with: ${data}`);
      reject(data);
    });

    logger.info('starting chromedriver service!');

    this.chromedriver.start({
      chromeOptions: {
        androidPackage: this.apkInfo.package,
        androidUseRunningApp: true,
        androidDeviceSerial: this.udid,
        androidProcess: this.apkInfo.androidProcess

return new Promise((resolve, reject) => {
    this.chromedriver = new ChromeDriver();
    this.chromedriver.on(ChromeDriver.EVENT_READY, data => {
      logger.info(`chromedriver ready with: ${JSON.stringify(data)}`);
      resolve('');
    });
    this.chromedriver.on(ChromeDriver.EVENT_ERROR, err => {
      logger.debug(`chromedriver failed to start: ${err}`);
      reject(err);
    });
    this.chromedriver.start(caps);
  });
};