message: Expand JS files if allowJS is enabled
  Fixes
diff: @@ -257,12 +257,13 @@ export class Application extends ChildableComponent<Application, AbstractCompone
  return exclude.some(mm => mm.match(fileName));
  }
  + const supportedFileRegex = this.options.getCompilerOptions().allowJs ? /\.[tj]sx?$/ : /\.tsx?$/;
  function add(dirname: string) {
  FS.readdirSync(dirname).forEach((file) => {
  const realpath = Path.join(dirname, file);
  if (FS.statSync(realpath).isDirectory()) {
  add(realpath);
  - } else if (/\.tsx?$/.test(realpath)) {
  + } else if (supportedFileRegex.test(realpath)) {
  if (isExcluded(realpath.replace(/\\/g, '/'))) {
  return;
  }
  