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Is webpack-sources ESM-only? Can you require() it?

Source code handling classes for webpack

Last verified Sep 9, 2026 against webpack-sources@3.5.1. Markdown · JSON

CommonJS CommonJS — require() works on every Node.js version we test

webpack-sources ships CommonJS only. require("webpack-sources") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.13.0. import "webpack-sources" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

What to do

  1. require("webpack-sources") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.13.0.
  2. From ES modules use the default import: import webpackSources from "webpack-sources"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
3.5.1 (Jul 6, 2026)
Module format
CommonJS
Last CommonJS version
3.5.1
TypeScript types
Bundled
Node engines
>=10.13.0
Weekly downloads
55.4M
License
MIT

Does webpack-sources@3.5.1 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("webpack-sources") from a CommonJS file and import "webpack-sources" from an ES module.

Runtimerequire("webpack-sources")import "webpack-sources"
Node.js 18✓ works✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4.0✓ works✓ works

How to import webpack-sources

ES modules (import)

import webpackSources from "webpack-sources";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const webpackSources = require("webpack-sources");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (48 versions; the newest 48 shown).

VersionsFormatFirst published
0.1.0 – 3.5.1CommonJSJan 3, 2016

Frequently asked

Is webpack-sources ESM-only?

webpack-sources@3.5.1 is a CommonJS package. webpack-sources ships CommonJS only. require("webpack-sources") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.13.0. import "webpack-sources" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import webpack-sources with ES module syntax?

Yes. import webpackSources from "webpack-sources" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does webpack-sources work in Bun?

Yes. import "webpack-sources" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does webpack-sources ship TypeScript types?

Yes. webpack-sources bundles its own type declarations; no @types package is needed.

Links

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