# Is function-bind ESM-only? Can you require() it?

> function-bind@1.1.2 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Implementation of Function.prototype.bind

Last verified Sep 9, 2026 against function-bind@1.1.2.

function-bind ships CommonJS only. require("function-bind") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "function-bind" 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("function-bind") 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 functionBind from "function-bind"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/function-bind

## Facts

- Latest: 1.1.2 (Oct 12, 2023)
- Module format: CommonJS
- Last CommonJS version: 1.1.2
- TypeScript types: @types/function-bind
- Node engines: not declared
- Weekly downloads: 141.3M
- License: MIT

## Runtime test results for function-bind@1.1.2

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

| Runtime | require("function-bind") | import "function-bind" |
|---|---|---|
| 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 function-bind

ES modules:

```js
import functionBind from "function-bind";
```

CommonJS:

```js
const functionBind = require("function-bind");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (6 versions; the newest 6 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 1.1.2 | CommonJS | Jun 16, 2013 |

## Frequently asked

**Is function-bind ESM-only?**

function-bind@1.1.2 is a CommonJS package. function-bind ships CommonJS only. require("function-bind") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "function-bind" 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 function-bind with ES module syntax?**

Yes. import functionBind from "function-bind" 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 function-bind work in Bun?**

Yes. import "function-bind" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does function-bind ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/function-bind".

## Links

- [function-bind on npm](https://www.npmjs.com/package/function-bind)
- [Source repository](https://github.com/Raynos/function-bind)
- [HTML version](https://canirequire.com/package/function-bind/)
- [JSON version](https://canirequire.com/package/function-bind.json)

---

For scripts and AI agents: any package is at https://canirequire.com/package/<name>/index.md (Markdown) or https://canirequire.com/package/<name>.json (JSON); the site index is https://canirequire.com/llms.txt. Fetch the URL directly; no search needed.