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

> asynckit@0.5.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Minimal async jobs utility library, with streams support

Last verified Sep 9, 2026 against asynckit@0.5.0.

asynckit ships CommonJS only. require("asynckit") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "asynckit" 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("asynckit") 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 asynckit from "asynckit"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: no types are available for asynckit; declare the module yourself if you need them.

## Facts

- Latest: 0.5.0 (Dec 18, 2025)
- Module format: CommonJS
- Last CommonJS version: 0.5.0
- TypeScript types: none
- Node engines: not declared
- Weekly downloads: 85.9M
- License: MIT

## Runtime test results for asynckit@0.5.0

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

| Runtime | require("asynckit") | import "asynckit" |
|---|---|---|
| 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 asynckit

ES modules:

```js
import asynckit from "asynckit";
```

CommonJS:

```js
const asynckit = require("asynckit");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (5 versions; the newest 5 shown).

| Versions | Format | First published |
|---|---|---|
| 0.1.0 – 0.5.0 | CommonJS | May 18, 2016 |

## Frequently asked

**Is asynckit ESM-only?**

asynckit@0.5.0 is a CommonJS package. asynckit ships CommonJS only. require("asynckit") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "asynckit" 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 asynckit with ES module syntax?**

Yes. import asynckit from "asynckit" 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 asynckit work in Bun?**

Yes. import "asynckit" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does asynckit ship TypeScript types?**

No. asynckit ships no type declarations and there is no @types package for it.

## Links

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

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