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

Generates and consumes source maps

Last verified Sep 9, 2026 against source-map-js@1.2.1. Markdown · JSON

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

source-map-js ships CommonJS only. require("source-map-js") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "source-map-js" 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-js") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0.
  2. From ES modules use the default import: import sourceMapJs from "source-map-js"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
1.2.1 (Sep 8, 2024)
Module format
CommonJS
Last CommonJS version
1.2.1
TypeScript types
Bundled
Node engines
>=0.10.0
Weekly downloads
157.7M
License
BSD-3-Clause

Does source-map-js@1.2.1 actually load? Runtime test results

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

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

ES modules (import)

import sourceMapJs from "source-map-js";

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 sourceMapJs = require("source-map-js");

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 (8 versions; the newest 8 shown).

VersionsFormatFirst published
0.6.2 – 1.2.1CommonJSFeb 7, 2021

Frequently asked

Is source-map-js ESM-only?

source-map-js@1.2.1 is a CommonJS package. source-map-js ships CommonJS only. require("source-map-js") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "source-map-js" 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-js with ES module syntax?

Yes. import sourceMapJs from "source-map-js" 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-js work in Bun?

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

Does source-map-js ship TypeScript types?

Yes. source-map-js bundles its own type declarations; no @types package is needed.

Links

Other commonjs packages

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