Registry / devops / webpack-rollup-loader

webpack-rollup-loader

library0.8.1jsnpmunverified

A Webpack loader that delegates module bundling to Rollup while using Webpack's own module resolution. Version 0.8.1 is the latest stable release, with no active development since 2020. It requires both webpack >=3.3.0 and rollup ^1.0.0 || ^2.0.0. Key differentiator: combines Rollup's tree-shaking and ES module optimizations with Webpack's plugin ecosystem and code splitting. Best suited for project entry points where Rollup's bundling is desired but full migration is impractical. Not for general .js files due to recursive bundling issues.

devops

npm install webpack-rollup-loader

github ↗package ↗

INSTALL

IMPORT

SIG · WEBPACK-ROLLUP-LOA

webpack-rollup-loader

devopsjavascriptv0.8.1

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–223 runs

build_error

glibc

node 18–223 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

default import

✓ No direct import; configured in Webpack config as a loader

✗ import webpackRollupLoader from 'webpack-rollup-loader'

This is a Webpack loader, not a JavaScript module for direct import.

Webpack rule for loader

✓ module.exports = { module: { rules: [ { test: /entry\.js$/, use: [{ loader: 'webpack-rollup-loader' }] } ] } }

✗ module.exports = { module: { rules: [ { test: /\.js$/, use: [{ loader: 'webpack-rollup-loader' }] } ] } }

Must only be applied to the entry module, not to all .js files.

Configures Webpack to use webpack-rollup-loader on the entry file only, with Rollup options and Babel for other JS files.

// webpack.config.js const path = require('path'); module.exports = { entry: './src/entry.js', output: { path: path.resolve(__dirname, 'dist'), filename: 'bundle.js' }, module: { rules: [ { test: /entry\.js$/, use: [ { loader: 'webpack-rollup-loader', options: { external: ['lodash'] } } ] }, { test: /\.js$/, exclude: /entry\.js$/, use: ['babel-loader'] } ] } };

Debug

Known issues

breakingLoader must only be applied once to the entry module. Applying it to all .js files will produce incorrect code.

fix

Use test: /entry\.js$/ or similar to target only the entry point.

affects: all

gotchaIf using Babel, ensure it does not convert ES6 imports to CommonJS. Otherwise, Rollup will not be able to analyze the module graph.

fix

In Babel config, disable @babel/plugin-transform-modules-commonjs or set modules: false.

affects: all

deprecatedPackage is in maintenance mode with no releases since 2020. Not compatible with Webpack 5 without additional adjustments.

fix

Consider alternative loaders like rollup-loader or migrate fully to Rollup or Webpack 5 native features.

affects: >=0.8.0

Errors

Common errors & fixes

Module build failed: Error: This loader must be used only once per entry module

The loader was applied to multiple modules or recursively.

fix

Restrict the loader to the entry module only using test: /entry\.js$/.

Error: Unexpected token: keyword (const). You may need an appropriate loader to handle this file type.

Babel converts ES modules to CommonJS before Rollup processes them, preventing tree-shaking.

fix

Set modules: false in Babel config for files processed by Rollup.

Upgrade

Version history

0.8.1latest on npm

Audit

Dependencies

webpackrequiredpeer dependency for loader interface

rolluprequiredpeer dependency - core bundling engine

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/erikdesjardins/webpack-rollup-loader ↗

packagehttps://www.npmjs.com/package/webpack-rollup-loader ↗