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

> yocto-queue@1.2.2 is ESM-only. ESM-only since 1.0.0 — last CommonJS version is 0.1.0.

Tiny queue data structure

Last verified Sep 9, 2026 against yocto-queue@1.2.2.

yocto-queue dropped its CommonJS build in 1.0.0 (August 2021). The last version with a plain require()-able CommonJS entry is 0.1.0, published Nov 24, 2020; it declares support for Node.js >=10.

On Node.js 20.19+, 22.12+ and newer, require("yocto-queue") 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("yocto-queue") fails with ERR_REQUIRE_ESM.

## What to do

1. On Node.js 20.19+, 22.12+ and newer, require("yocto-queue") 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 yoctoQueue = await import("yocto-queue"). That works on every Node.js version the package supports (>=12.20).
3. If you need a synchronous require() or run Node.js 18: npm install yocto-queue@0.1.0, the last CommonJS release (published Nov 24, 2020); it declares Node.js >=10.
4. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 1.2.2 (Nov 11, 2025)
- Module format: ESM-only
- Last CommonJS version: 0.1.0
- ESM-only since: 1.0.0 (Aug 12, 2021)
- TypeScript types: bundled
- Node engines: >=12.20
- Weekly downloads: 170.0M
- License: MIT

## Runtime test results for yocto-queue@1.2.2

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

| Runtime | require("yocto-queue") | import "yocto-queue" |
|---|---|---|
| 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 yocto-queue

ES modules:

```js
import * as yoctoQueue from "yocto-queue";
```

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 yoctoQueue = require("yocto-queue");

// Any Node.js version the package supports (>=12.20), from an async function:
async function main() {
  const yoctoQueue = await import("yocto-queue");
}

// Or pin the last CommonJS release (declares Node.js >=10):
// npm install yocto-queue@0.1.0
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (8 versions; the newest 8 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 1.2.2 | ESM-only | Aug 12, 2021 |
| 0.0.0 – 0.1.0 | CommonJS | Nov 24, 2020 |

## Frequently asked

**Is yocto-queue ESM-only?**

yocto-queue@1.2.2 is ESM-only. yocto-queue dropped its CommonJS build in 1.0.0 (August 2021). The last version with a plain require()-able CommonJS entry is 0.1.0, published Nov 24, 2020; it declares support for Node.js >=10.

**Which version of yocto-queue still supports CommonJS / require()?**

0.1.0 is the last version of yocto-queue with a CommonJS build; it declares Node.js >=10. Install it with "npm install yocto-queue@0.1.0". Every version from 1.0.0 on is ESM-only.

**How do I use yocto-queue from a CommonJS file?**

From a CommonJS file, use a dynamic import inside an async function: const yoctoQueue = await import("yocto-queue"). That works on every Node.js version the package supports (>=12.20). On Node.js 20.19+, 22.12+ and newer, require("yocto-queue") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin yocto-queue@0.1.0 (declares Node.js >=10).

**Does yocto-queue work in Bun?**

Yes. import "yocto-queue" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does yocto-queue ship TypeScript types?**

Yes. yocto-queue bundles its own type declarations; no @types package is needed.

## Links

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

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