rollupify

0.5.1 verified Mon Apr 27 auth: no javascript deprecated

A Browserify transform that applies Rollup to convert ES6/ES2015 modules into a single CommonJS module, enabling tree-shaking and scope-hoisting for smaller bundles. The current stable version is 0.5.1. This package is unmaintained and considered a legacy hack for migrating from Browserify to Rollup; most users should instead use Rollup directly with rollup-plugin-commonjs and rollup-plugin-node-resolve. Its key differentiator is seamless integration with the Browserify pipeline, applying Rollup before other transforms like babelify. However, it only works on ES6 import/export statements, leaving require() calls untouched. Sourcemap support requires --debug flag.

Common errors

error TypeError: Cannot read property 'code' of undefined ↓

cause rollupify encountered a file it couldn't parse, possibly due to unsupported syntax like require() or non-ES6 module.

fix

Ensure all files are ES6 modules; convert require() calls to import/export.

error Error: Config file not found: rollup.config.js ↓

cause The --config path is incorrect or the file does not exist.

fix

Check that the config file path is correct relative to the current working directory.

error Bundle contains require() calls - rollupify not applied ↓

cause rollupify did not process the file; possible transform order issue or file is not an ES6 module.

fix

Ensure rollupify is listed before other transforms and that files use import/export.

Warnings

deprecated Package is marked as unmaintained and no longer actively developed. ↓

fix Migrate to a pure Rollup setup with rollup-plugin-commonjs and rollup-plugin-node-resolve.

breaking Works only on ES6 import/export statements. require() calls are left untouched. ↓

fix Convert all require() calls to import/export if you want them bundled.

gotcha When using with babelify, rollupify must be applied first. ↓

fix Specify transforms in order: rollupify then babelify.

gotcha Sourcemaps require --debug flag in Browserify. ↓

fix Pass --debug or {debug: true} to Browserify.

breaking Config must be passed as --config for CLI or as options object programmatically; not via a separate config file reference. ↓

fix Use a rollup.config.js file or pass config object directly.

Install

npm install rollupify

yarn add rollupify

pnpm add rollupify

Imports

default
wrong
```
import rollupify from 'rollupify'
```
correct
```
const rollupify = require('rollupify')
```
CJS-only; no ESM exports. Use require() to load the transform.
transform
wrong
```
b.transform('rollupify', {})
```
correct
```
b.transform('rollupify', { config: { ... } })
```
Second argument may include rollup config options; empty object is valid.
package.json transform
wrong
```
"transform": ["rollupify"]
```
correct
```
"browserify": { "transform": ["rollupify"] }
```
Must be under browserify key in package.json, not top-level.

Quickstart

Basic usage of rollupify with Browserify command line to transform ES6 modules into a bundled CommonJS output.

// Install
npm install rollupify

// index.js
import hello from './hello';
console.log(hello);
export default hello;

// hello.js
export default "hello world";

// Command line
browserify -t rollupify index.js > output.js

// Or with custom rollup.config.js
// browserify -t [ rollupify --config rollup.config.js ] index.js > output.js