How to console detailed error message - resolved

[dbwcooper]

Hi,
I'm learning to use gulp and gulp less to compile some less files. I got some error information, but I can't locate which file reported an error. The error information is as follows:

(node:20992) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:20992) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

there are my codes:

function combineComponentStyle({ category, type }) {
  return (
    src(`component/**/*.less`)
      .pipe(
        gulpLess({
          compress: true,
          javascriptEnabled: true,
          math: 'always',
        }),
      )
      .pipe(concat(`${type}.css`))
      .pipe(dest(`.theme/color`))
  );
}

What should i do to console more detailed error messages ?

Thank you very much for your help

[dbwcooper]

It has been solved. That's what I did.

function combineComponentStyle({ category, type }) {
  return (
    src(`component/**/*.less`)
      .pipe(
        gulpLess({
          compress: true,
          javascriptEnabled: true,
          math: 'always',
        }),
      )
      .pipe(concat(`${type}.css`))
      .pipe(dest(`.theme/color`))
      .end(function(error) {
        console.log(error);
      })
  );
}

[dbwcooper]

updated:

function combineComponentStyle({ category, type }) {
   return new Promise((resolve, reject) => {
    src(`component/**/*.less`)
      .pipe(
        gulpLess({
          compress: true,
          javascriptEnabled: true,
          math: 'always',
        }),
      )
      .pipe(concat(`${type}.css`))
      .pipe(dest(`.theme/color`))
      .on('end', resolve)
      .on('error', console.log);
  });
}