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

> source-map-support@0.5.21 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Fixes stack traces for files with source maps

Last verified Sep 9, 2026 against source-map-support@0.5.21.

source-map-support ships CommonJS only. require("source-map-support") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "source-map-support" 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-support") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
2. From ES modules use the default import: import sourceMapSupport from "source-map-support"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/source-map-support

## Facts

- Latest: 0.5.21 (Nov 19, 2021)
- Module format: CommonJS
- Last CommonJS version: 0.5.21
- TypeScript types: @types/source-map-support
- Node engines: not declared
- Weekly downloads: 95.0M
- License: MIT

## Runtime test results for source-map-support@0.5.21

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

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

ES modules:

```js
import sourceMapSupport from "source-map-support";
```

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (66 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.6 – 0.5.21 | CommonJS | Jun 11, 2013 |

## Frequently asked

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

source-map-support@0.5.21 is a CommonJS package. source-map-support ships CommonJS only. require("source-map-support") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "source-map-support" 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-support with ES module syntax?**

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

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

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

Not bundled. Install the community types with "npm install -D @types/source-map-support".

## Links

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

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