UnhandledPromiseRejectionWarning

UnhandledPromiseRejectionWarning

通过以下代码，定位原始错误

if (!process.env.LISTENING_TO_UNHANDLED_REJECTION) {
  process.on('unhandledRejection', reason => {
    // throw reason;
    // eslint-disable-next-line no-console
    console.log('val: ', reason);
  });
  // Avoid memory leak by adding too many listeners
  process.env.LISTENING_TO_UNHANDLED_REJECTION = true;
}