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

🔎 A simple, tiny and lightweight benchmarking library!

Last verified Sep 9, 2026 against tinybench@6.1.6. JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.1.1

tinybench dropped its CommonJS build in 4.0.0 (March 2025). The last version you can require() on every Node.js version, including 18 and older, is 3.1.1, published Jan 29, 2025.

On Node.js 20.19+, 22.12+ and every newer release, require("tinybench") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

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

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

Does tinybench@6.1.6 actually load? Runtime test results

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

Runtimerequire("tinybench")import "tinybench"
Node.js 18✗ failsERR_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✓ works✓ works

How to import tinybench

ES modules (import)

import tinybench from "tinybench";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const tinybench = require("tinybench");

// Any Node.js version:
const tinybench = await import("tinybench");

// Or pin the last CommonJS release:
// 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).

VersionsFormatFirst published
4.0.0 – 6.1.6ESM-onlyMar 18, 2025
2.0.1 – 3.1.1Dual (CommonJS + ESM)Aug 24, 2022
1.0.0 – 1.0.2CommonJSApr 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 you can require() on every Node.js version, including 18 and older, is 3.1.1, published Jan 29, 2025.

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

3.1.1 is the last version of tinybench with a CommonJS build. 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?

Use a dynamic import: const mod = await import("tinybench"). On Node.js 20.19+, 22.12+ and newer, a plain require("tinybench") also works for ESM packages that do not use top-level await. Alternatively pin tinybench@3.1.1.

Does tinybench work in Bun?

Yes. import "tinybench" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does tinybench ship TypeScript types?

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

Links

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