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Is source-map-loader ESM-only? Can you require() it?

extracts inlined source map and offers it to webpack

Last verified Sep 9, 2026 against source-map-loader@5.0.0. Markdown · JSON

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

source-map-loader ships CommonJS only. require("source-map-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.12.0. import "source-map-loader" 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("source-map-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.12.0.
  2. From ES modules use the default import: import sourceMapLoader from "source-map-loader"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: no types are available for source-map-loader; declare the module yourself if you need them.
Latest
5.0.0 (Jan 15, 2024)
Module format
CommonJS
Last CommonJS version
5.0.0
TypeScript types
None
Node engines
>= 18.12.0
Weekly downloads
10.8M
License
MIT

Does source-map-loader@5.0.0 actually load? Runtime test results

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

Runtimerequire("source-map-loader")import "source-map-loader"
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 source-map-loader

ES modules (import)

import sourceMapLoader from "source-map-loader";

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 sourceMapLoader = require("source-map-loader");

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 (29 versions; the newest 29 shown).

VersionsFormatFirst published
0.1.0 – 5.0.0CommonJSMay 22, 2014

Frequently asked

Is source-map-loader ESM-only?

source-map-loader@5.0.0 is a CommonJS package. source-map-loader ships CommonJS only. require("source-map-loader") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.12.0. import "source-map-loader" 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 source-map-loader with ES module syntax?

Yes. import sourceMapLoader from "source-map-loader" 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 source-map-loader work in Bun?

Yes. import "source-map-loader" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does source-map-loader ship TypeScript types?

No. source-map-loader ships no type declarations and there is no @types package for it.

Links

Other commonjs packages

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