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

> tinybench@6.1.6 is ESM-only. ESM-only since 4.0.0 — last CommonJS version is 3.1.1.

🔎 A simple, tiny and lightweight benchmarking library!

Last verified Sep 9, 2026 against tinybench@6.1.6.

tinybench dropped its CommonJS build in 4.0.0 (March 2025). The last version with a plain require()-able CommonJS entry is 3.1.1, published Jan 29, 2025; it declares support for Node.js >=18.0.0.

On Node.js 20.19+, 22.12+ and newer, require("tinybench") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Node.js 18 has no require(esm), and tinybench@6.1.6 declares Node.js >=20.0.0, so 18 is outside its supported range anyway.

tinybench@6.1.6 declares engines ">=20.0.0", so Node.js 18 is outside its supported range regardless of module format.

## What to do

1. On Node.js 20.19+, 22.12+ and newer, require("tinybench") 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 tinybench = await import("tinybench"). That works on every Node.js version the package supports (>=20.0.0).
3. If you need a synchronous require() or run Node.js 18: npm install tinybench@3.1.1, the last CommonJS release (published Jan 29, 2025); it declares Node.js >=18.0.0.
4. tinybench@6.1.6 declares engines ">=20.0.0", so Node.js 18 is unsupported regardless: upgrade Node.js or pin an older release.
5. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 6.1.6 (Sep 5, 2026)
- Module format: ESM-only
- Last CommonJS version: 3.1.1
- ESM-only since: 4.0.0 (Mar 18, 2025)
- TypeScript types: bundled
- Node engines: >=20.0.0
- Weekly downloads: 62.4M
- License: MIT

## Runtime test results for tinybench@6.1.6

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

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

ES modules:

```js
import * as tinybench from "tinybench";
```

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 tinybench = require("tinybench");

// Any Node.js version the package supports (>=20.0.0), from an async function:
async function main() {
  const tinybench = await import("tinybench");
}

// Or pin the last CommonJS release (declares Node.js >=18.0.0):
// npm install tinybench@3.1.1
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (54 versions; the newest 54 shown).

| Versions | Format | First published |
|---|---|---|
| 4.0.0 – 6.1.6 | ESM-only | Mar 18, 2025 |
| 2.0.1 – 3.1.1 | Dual (CommonJS + ESM) | Aug 24, 2022 |
| 1.0.0 – 1.0.2 | CommonJS | Apr 29, 2022 |

## Frequently asked

**Is tinybench ESM-only?**

tinybench@6.1.6 is ESM-only. tinybench dropped its CommonJS build in 4.0.0 (March 2025). The last version with a plain require()-able CommonJS entry is 3.1.1, published Jan 29, 2025; it declares support for Node.js >=18.0.0.

**Which version of tinybench still supports CommonJS / require()?**

3.1.1 is the last version of tinybench with a CommonJS build; it declares Node.js >=18.0.0. Install it with "npm install tinybench@3.1.1". Every version from 4.0.0 on is ESM-only.

**How do I use tinybench from a CommonJS file?**

From a CommonJS file, use a dynamic import inside an async function: const tinybench = await import("tinybench"). That works on every Node.js version the package supports (>=20.0.0). On Node.js 20.19+, 22.12+ and newer, require("tinybench") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin tinybench@3.1.1 (declares Node.js >=18.0.0).

**Does tinybench work in Bun?**

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

**Does tinybench ship TypeScript types?**

Yes. tinybench bundles its own type declarations; no @types package is needed.

## Links

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

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