message: fix(utils): config could use .js extension
diff: @@ -8,7 +8,7 @@ function transform(opts: { extname: string; implementor: any }) {
  return (mod: any, filename: string) => {
  files.push(filename);
  let code = readFileSync(filename, 'utf-8');
  - if (['.ts', '.tsx'].includes(opts.extname)) {
  + if (['.js', '.jsx', '.ts', '.tsx'].includes(opts.extname)) {
  code = opts.implementor.transformSync(code, {
  loader: opts.extname.slice(1),
  target: 'es2017',
  