Espruino plugin for Rollup module bundler

In order to use Espruino modules (and other CommonJS modules) a few extra steps are required, especially if you also want to uglify/minify the code. This assumes you already have Node, npm and Rollup installed.

First, install the plugins…

npm install rollup-plugin-espruino
npm install rollup-plugin-commonjs
npm install rollup-plugin-uglify

You need to use the "harmony" branch of the uglify-js library for the uglify plugin to support ES modules. This will fetch it from GitHub:

npm install mishoo/UglifyJS2#harmony

Finally, add the following configuration to your Rollup config (rollup.config.js if using the CLI):

import espruino from 'rollup-plugin-espruino'
import commonjs from 'rollup-plugin-commonjs'
import uglify from 'rollup-plugin-uglify'
import { minify } from 'uglify-js'

export default {
  entry: 'src/main.js',
  dest: 'dist/bundle.js',
  format: 'es',
  plugins: [
    commonjs(),
    uglify({}, minify),
    espruino(),
  ],
}

Here I'm passing the "harmony" branch of uglify-js as minify to the uglify plugin.

And with that, it should work as expected. In harmony.

Luckily, other plugins are more straight forward.