Investigate adding missing typings warning about create-react-app-typescript HOT 3 CLOSED

if (useYarn) {
    command = 'yarnpkg';
    args = ['add'];
    devArgs = ['add', '--dev'];
  } else {
    command = 'npm';
    args = [
      'install',
      '--save',
      verbose && '--verbose'
    ].filter(function(e) { return e; });
    devArgs = [
      'install',
      '--save-dev',
      verbose && '--verbose'
    ].filter(function(e) { return e; });
  }
  args.push('react', 'react-dom');
  devArgs.push('@types/node', '@types/react', '@types/react-dom', '@types/jest');

  // Install devDependencies (typings, etc ...)
  console.log('Installing devDependencies using ' + command + '...');
  console.log();
  var devProc = spawn.sync(command, devArgs, {stdio: 'inherit'});
  if (devProc.status !== 0) {
    console.error('`' + command + ' ' + args.join(' ') + '` failed');
    return;
  }