Autoprefixer-transform

Autoprefixer transform stream

npm i -D autoprefixer-transform

import fs from 'fs'
import autoprefixer from 'autoprefixer-transform'

fs.createReadStream( 'styles.css' )
  .pipe( autoprefixer({ browsers: [ 'last 2 versions' ] } ) )
  .pipe( fs.createWriteStream( 'main.css' ) )