Rollup.js cheatsheet

Basic config

rollup.config.js

export default {
  input: 'src/main.js',
  output: {
    file: 'bundle.js',
    format: 'cjs'
  }
}

Terminal

npm install -D rollup

You may need to use ./node_modules/.bin/rollup as a command if you did not install rollup globally.

Multiple outputs

rollup.config.js

export default [
  {
    input: 'src/main.js',
    output: {
      file: __dirname + '/public/main.js',
      format: 'cjs',
      name: 'main'
    }
  },
  {
    input: 'src/vendor.js',
    output: {
      file: __dirname + 'public/vendor.js',
      format: 'cjs',
      name: 'vendor'
    }
  }
]

This creates main.js and vendor.js.

Using plugins

Plugins

Terminal

npm install -D @rollup/plugin-json

rollup.config.js

import json from '@rollup/plugin-json'

export default {
  input: 'src/main.js',
  output: {
    file: 'bundle.js',
    format: 'cjs'
  },
  plugins: [ json() ]
}

npm packages

Terminal

npm install -D @rollup/plugin-node-resolve

rollup.config.js

import resolve from '@rollup/plugin-node-resolve'

export default {
  input: 'src/main.js',
  output: {
    file: 'bundle.js',
    format: 'cjs'
  },
  plugins: [ resolve() ]
}

When you run a npm run build, no warning is emitted and contains the imported modules.

Peer dependencies

Terminal

npm install -D @rollup/plugin-node-resolve

rollup.config.js

import resolve from '@rollup/plugin-node-resolve'

export default {
  input: 'src/main.js',
  output: {
    file: 'bundle.js',
    format: 'cjs'
  },
  plugins: [resolve({
    // pass custom options to the resolve plugin
    customResolveOptions: {
      moduleDirectory: 'node_modules'
    }
  })],
  // indicate which modules should be treated as external
  external: ['lodash']
}

Babel

Terminal

npm install -D @rollup/plugin-babel

rollup.config.js

import resolve from '@rollup/plugin-node-resolve'
import babel from '@rollup/plugin-babel'

export default {
  input: 'src/main.js',
  output: {
    file: 'bundle.js',
    format: 'cjs'
  },
  plugins: [
    resolve(),
    babel({
      exclude: 'node_modules/**' // only transpile our source code
    })
  ]
}

src/.babelrc

{
  "presets": [
    ["latest", {
      "es2015": {
        "modules": false
      }
    }]
  ],
  "plugins": ["external-helpers"]
}