Use rework plugins about preprocessor HOT 2 CLOSED

var gulp = require('gulp');
var rework = require('gulp-rework');
var autoprefixer = require('gulp-autoprefixer');
var reworkAt2x = require('rework-plugin-at2x');
var reworkSuit = require('rework-suit');

gulp.task('suit', function() {
  return gulp.src('*.css')
    .pipe(rework(
      reworkSuit(),
      reworkAt2x()
    ))
    .pipe(autoprefixer())
    .pipe(gulp.dest('built/'));
});

var autoprefixer = require('autoprefixer');
var rework       = require('rework');
var suit         = require('rework-suit');
var colors       = require('rework-plugin-colors');
var at2x         = require('rework-plugin-at2x');
var inherit      = require('rework-inherit');
var fs           = require('fs');

var browserConfig = [
    'Explorer >= 9',
    'last 2 Chrome versions',
    'last 2 Firefox versions',
    'last 2 Safari versions',
    'last 2 iOS versions',
    'Android 4'
];

var css = fs.readFileSync('index.css','utf8');

var bundle = rework(css, { source: 'index.css' })
                .use(suit({ source: 'index.css' }))
                .use(inherit())
                .use(colors())
                .use(at2x())
                .toString({ sourcemap: true });

bundle = autoprefixer(browserConfig).process(bundle).css;

fs.writeFileSync('bundle.css', bundle);