How to use the convert-source-map.commentRegex function in convert-source-map

}

    consumer = await new SourceMapConsumer(converter.toJSON());
  }

  if (!consumer) {
    throw new AppError({ code: 'NoSourceMap' });
  }

  return {
    consumer,
    codeFileContent,
  };
}

const COMMENT_REGEX = convert.commentRegex;
const MAP_FILE_COMMENT_REGEX = convert.mapFileCommentRegex;

/** Extract either source map comment from file content */
function getSourceMapComment(fileContent: string): string {
  const sourceMapComment =
    getFirstRegexMatch(COMMENT_REGEX, fileContent) ||
    getFirstRegexMatch(MAP_FILE_COMMENT_REGEX, fileContent) ||
    '';

  // Remove trailing EOLs
  return sourceMapComment.trim();
}

const LF = '\n';
const CR_LF = '\r\n';

function sourcemapComments(src) {
    var matches = src.match(commentRegex);
    return matches ? matches.length : 0;
  }