How to use the conventional-changelog function in conventional-changelog

return new Promise((resolve, reject) => {
		const data = [];

		conventionalChangelog({
			preset: 'angular'
		})
		.on('data', chunk => {
			data.push(chunk);
		})
		.on('end', () => {
			resolve(data.join(''));
		})
		.on('error', error => {
			reject(error);
		});
	});
}

gulp.task('changelog', function () {
	return changelog({
		preset: 'angular',
		releaseCount: 0
	})
	.pipe(fs.createWriteStream('CHANGELOG.md'));
});

export default function (cb) {
  const pkg = JSON.parse(readFile('./package.json'))
  const repository = pkg.repository ? parseUrl(pkg.repository.url) : null

  changelog({
    version: pkg.version,
    repository: repository,
    file: false
  }, cb)
}

gulp.task('changelog', function () {
	return conventionalChangelog({
		preset: 'angular',
		releaseCount: 0
	})
		.pipe(fs.createWriteStream('CHANGELOG.md'));
});

function runConventionalChangelog({
  args,
  templateContext,
  gitRawCommitsOpts,
  resolve,
  reject,
}) {
  const changelogStream = conventionalChangelog(
    args,
    templateContext,
    gitRawCommitsOpts
  ).on('error', reject);

  const readStream = fs.createReadStream(args.infile).on('error', reject);
  if (args.sameFile) {
    if (args.append) {
      changelogStream
        .pipe(
          fs.createWriteStream(args.outfile, {
            flags: 'a',
          })
        )
        .on('finish', resolve);
    } else {

gulp.task('changelog', () => {
  return changelog({
    preset: 'angular',
    releaseCount: 0
  })
  .pipe(fs.createWriteStream(paths.changelog));
});

gulp.task('release-generate-changelog', () => {
  const newChangesStream = changelog(
    {preset: 'angular', warn: log},
    {},
    {},
    {noteKeywords: ['BREAKING CHANGE', 'DEPRECATION WARNING']},
    {transform: commitTransform}
  );

  const oldChangesStream = gulp.src('../CHANGELOG.md')
    .pipe(map((file, cb) => cb(null, file.contents)));

  const latestChangesFileStream = newChangesStream
    .pipe(source('LATEST_CHANGES.md'));

  const changelogFileStream = series(newChangesStream, oldChangesStream)
    .pipe(source('CHANGELOG.md'));