rollup-plugin-postcss VS rollup-plugin-terser

The React Library Builder supports both SCSS and CSS out of the box, so you can style your components as you normally would. If you want to use CSS modules, you can refer to the rollup-plugin-postcss documentation for more information.

import { nodeResolve } from "@rollup/plugin-node-resolve"; import postcss from "rollup-plugin-postcss"; import copy from "rollup-plugin-copy"; export default [ { input: "src/js/combine.js", output: { file: "src/js/minified/index.bundle.js", sourcemap: false, } plugins: [ nodeResolve(), postcss({ extract: true, // no way to move output to another folder https://github.com/egoist/rollup-plugin-postcss/issues/250 minimize: true, }), copy({ targets: [ { src: "src/js/minified/index.bundle.css", dest: "src/styles/minified", rename: "fonts.bundle.css", }, ], verbose: true, hook: "writeBundle", }) ], } ];

To process Less files we will use PostCSS, which is a JavaScript build tool for CSS, Less, and other CSS preprocessors. It also comes with a built-in minifier. We can add it to the project with a Rollup plugin:

This next one will help us reduce final bundle size by minifying the generated code. It's called rollup-plugin-terser and uses terser under the hood to minify the code.

Generating a bundle that has many dependencies, from our code or third-party packages, will result in a large JavaScript file. To optimize the bundle it is useful to integrate Terser into our build process. What Terser does is it removes comments, shorten variables names, cut whitespaces and minify our code to make it the shortest possible. Again Terser can be integrated with Rollup using a plugin: