File Minification in Gulp

Let's now learn how to apply operations to a set of files. First, we will minimize CSS files. This is done using the gulp-clean-css plugin.

First, this plugin must be installed in our project:

terminalnpm install gulp-clean-css --save-dev

After that, import the installed plugin:

javascriptlet {src, dest} = require('gulp');
let cleanCSS = require('gulp-clean-css');

Use it for some file:

javascriptfunction task(cb) {
  return src('src/styles.css')
    .pipe(cleanCSS())
    .pipe(dest('dist'));
}

Use our plugin for a group of files:

javascriptfunction task(cb) {
  return src('src/*.css')
    .pipe(cleanCSS())
    .pipe(dest('dist'));
}