rollup-plugin-cjs

Converts CommonJS files to ES modules in a way that's compatible with __esModule files.

Unlike @rollup/plugin-commonjs, this plugin will check for the existence of __esModule at runtime, which should improve compatibility with packages in the wild.

Usage

This plugin should replace @rollup/plugin-commonjs:

import cjs from "rollup-plugin-cjs";

export default {
  input: "src/index.js",
  output: {
    dir: "output",
  },
  plugins: [cjs()],
};

Current limitations

• Importing using a re-assigned require (e.g. (function(r){r('lib')})(require)) will not work.
• No tree-shaking for CommonJS.
• When using import * as lib from 'commonjs-lib the imported values are not live.
• Dynamic require is not supported.

All of these could be fixed, they are just not implemented at the moment.