npm install --save-dev start-postcss
# or
yarn add --dev start-postcss

import start from 'start';
import reporter from 'start-pretty-reporter';
import files from 'start-files';
import clean from 'start-clean';
import read from 'start-read';
import less from 'start-less';
import postcss from 'start-postcss';
import rename from 'start-rename';
import write from 'start-write';

import autoprefixer from 'autoprefixer';

export const build = () => start(reporter())(
  files('build/'),
  clean(),
  files('lib/**/*.less'),
  read(),
  less({ sourceMap: true }),
  postcss([ autoprefixer ], { map: true }),
  rename(file => file.replace(/\.less$/, '.css')),
  write('build/')
);