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

> source-map@0.8.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Generates and consumes source maps

Last verified Sep 9, 2026 against source-map@0.8.0.

source-map ships CommonJS only. require("source-map") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 12. import "source-map" 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") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 12.
2. From ES modules use the default import: import sourceMap from "source-map"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 0.8.0 (Jul 20, 2026)
- Module format: CommonJS
- Last CommonJS version: 0.8.0
- TypeScript types: bundled
- Node engines: >= 12
- Weekly downloads: 319.9M
- License: BSD-3-Clause

## Runtime test results for source-map@0.8.0

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

| Runtime | require("source-map") | import "source-map" |
|---|---|---|
| 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

ES modules:

```js
import sourceMap from "source-map";
```

CommonJS:

```js
const sourceMap = require("source-map");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (70 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.9 – 0.8.0 | CommonJS | Mar 1, 2013 |

## Frequently asked

**Is source-map ESM-only?**

source-map@0.8.0 is a CommonJS package. source-map ships CommonJS only. require("source-map") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 12. import "source-map" 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 with ES module syntax?**

Yes. import sourceMap from "source-map" 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 work in Bun?**

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

**Does source-map ship TypeScript types?**

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

## Links

- [source-map on npm](https://www.npmjs.com/package/source-map)
- [Source repository](https://github.com/mozilla/source-map)
- [HTML version](https://canirequire.com/package/source-map/)
- [JSON version](https://canirequire.com/package/source-map.json)

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