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

> setimmediate@1.0.5 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

A shim for the setImmediate efficient script yielding API

Last verified Sep 9, 2026 against setimmediate@1.0.5.

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

## Facts

- Latest: 1.0.5 (Sep 12, 2016)
- Module format: CommonJS
- Last CommonJS version: 1.0.5
- TypeScript types: @types/setimmediate
- Node engines: not declared
- Weekly downloads: 50.7M
- License: MIT

## Runtime test results for setimmediate@1.0.5

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

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

ES modules:

```js
import setimmediate from "setimmediate";
```

CommonJS:

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

## 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 |
|---|---|---|
| 1.0.0 – 1.0.5 | CommonJS | Dec 31, 2012 |

## Frequently asked

**Is setimmediate ESM-only?**

setimmediate@1.0.5 is a CommonJS package. setimmediate ships CommonJS only. require("setimmediate") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "setimmediate" 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 setimmediate with ES module syntax?**

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

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

**Does setimmediate ship TypeScript types?**

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

## Links

- [setimmediate on npm](https://www.npmjs.com/package/setimmediate)
- [Source repository](https://github.com/yuzujs/setImmediate)
- [HTML version](https://canirequire.com/package/setimmediate/)
- [JSON version](https://canirequire.com/package/setimmediate.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.