# Is shebang-regex ESM-only? Can you require() it?

> shebang-regex@4.0.0 is ESM-only. ESM-only since 4.0.0 — last CommonJS version is 3.0.0.

Regular expression for matching a shebang line

Last verified Sep 9, 2026 against shebang-regex@4.0.0.

shebang-regex dropped its CommonJS build in 4.0.0 (August 2021). The last version with a plain require()-able CommonJS entry is 3.0.0, published Apr 27, 2019; it declares support for Node.js >=8.

On Node.js 20.19+, 22.12+ and newer, require("shebang-regex") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("shebang-regex") fails with ERR_REQUIRE_ESM.

## What to do

1. On Node.js 20.19+, 22.12+ and newer, require("shebang-regex") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
2. From a CommonJS file, use a dynamic import inside an async function: const shebangRegex = await import("shebang-regex"). That works on every Node.js version the package supports (^12.20.0 || ^14.13.1 || >=16.0.0).
3. If you need a synchronous require() or run Node.js 18: npm install shebang-regex@3.0.0, the last CommonJS release (published Apr 27, 2019); it declares Node.js >=8.
4. TypeScript: npm install -D @types/shebang-regex

## Facts

- Latest: 4.0.0 (Aug 13, 2021)
- Module format: ESM-only
- Last CommonJS version: 3.0.0
- ESM-only since: 4.0.0 (Aug 13, 2021)
- TypeScript types: @types/shebang-regex
- Node engines: ^12.20.0 || ^14.13.1 || >=16.0.0
- Weekly downloads: 200.2M
- License: MIT

## Runtime test results for shebang-regex@4.0.0

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

| Runtime | require("shebang-regex") | import "shebang-regex" |
|---|---|---|
| Node.js 18 | fails (ERR_REQUIRE_ESM) | 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 shebang-regex

ES modules:

```js
import * as shebangRegex from "shebang-regex";
```

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS:

```js
// Node.js 20.19+, 22.12+ and newer (verified):
const shebangRegex = require("shebang-regex");

// Any Node.js version the package supports (^12.20.0 || ^14.13.1 || >=16.0.0), from an async function:
async function main() {
  const shebangRegex = await import("shebang-regex");
}

// Or pin the last CommonJS release (declares Node.js >=8):
// npm install shebang-regex@3.0.0
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (4 versions; the newest 4 shown).

| Versions | Format | First published |
|---|---|---|
| 4.0.0 | ESM-only | Aug 13, 2021 |
| 1.0.0 – 3.0.0 | CommonJS | Feb 17, 2015 |

## Frequently asked

**Is shebang-regex ESM-only?**

shebang-regex@4.0.0 is ESM-only. shebang-regex dropped its CommonJS build in 4.0.0 (August 2021). The last version with a plain require()-able CommonJS entry is 3.0.0, published Apr 27, 2019; it declares support for Node.js >=8.

**Which version of shebang-regex still supports CommonJS / require()?**

3.0.0 is the last version of shebang-regex with a CommonJS build; it declares Node.js >=8. Install it with "npm install shebang-regex@3.0.0". Every version from 4.0.0 on is ESM-only.

**How do I use shebang-regex from a CommonJS file?**

From a CommonJS file, use a dynamic import inside an async function: const shebangRegex = await import("shebang-regex"). That works on every Node.js version the package supports (^12.20.0 || ^14.13.1 || >=16.0.0). On Node.js 20.19+, 22.12+ and newer, require("shebang-regex") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin shebang-regex@3.0.0 (declares Node.js >=8).

**Does shebang-regex work in Bun?**

Yes. import "shebang-regex" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does shebang-regex ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/shebang-regex".

## Links

- [shebang-regex on npm](https://www.npmjs.com/package/shebang-regex)
- [Source repository](https://github.com/sindresorhus/shebang-regex)
- [HTML version](https://canirequire.com/package/shebang-regex/)
- [JSON version](https://canirequire.com/package/shebang-regex.json)

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