How to use wait-on - 3 common examples

const waitOnPromise = options => new Promise(resolve => waitOn(options, resolve));
const wait = time => new Promise(resolve => setTimeout(resolve, time));

const { launchTimeout, protocol, host, port, waitOnScheme } = config

    let url = ''
    if (protocol === 'tcp' || protocol === 'socket') {
      url = `${protocol}:${host}:${port}`
    } else {
      url = `${protocol}://${host}:${port}`
    }
    const opts = {
      resources: [url],
      timeout: launchTimeout,
      ...waitOnScheme,
    }

    try {
      await waitOn(opts)
    } catch (err) {
      throw new JestDevServerError(
        `Server has taken more than ${launchTimeout}ms to start.`,
        ERROR_TIMEOUT,
      )
    }
  }
}

new Promise((resolve, reject) =>
    waitOn(options, err => {
      if (err) return reject(err);
      resolve();
    }),
  );