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Is @size-limit/preset-small-lib ESM-only? Can you require() it?

Size Limit preset for small open source libraries

Last verified Sep 9, 2026 against @size-limit/preset-small-lib@13.0.3. Markdown · JSON

ESM-only ESM-only since 10.0.0 — last CommonJS version is 9.0.0

@size-limit/preset-small-lib dropped its CommonJS build in 10.0.0 (October 2023). The last version with a plain require()-able CommonJS entry is 9.0.0, published Sep 5, 2023.

On Node.js 20.19+, 22.12+ and newer, require("@size-limit/preset-small-lib") 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("@size-limit/preset-small-lib") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("@size-limit/preset-small-lib") 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 presetSmallLib = await import("@size-limit/preset-small-lib"). That works on every Node.js version the package supports.
  3. If you need a synchronous require() or run Node.js 18: npm install @size-limit/preset-small-lib@9.0.0, the last CommonJS release (published Sep 5, 2023).
  4. TypeScript: no types are available for @size-limit/preset-small-lib; declare the module yourself if you need them.
Latest
13.0.3 (Jul 30, 2026)
Module format
ESM-only
Last CommonJS version
9.0.0
ESM-only since
10.0.0 (Oct 23, 2023)
TypeScript types
None
Node engines
not declared
Weekly downloads
208K
License
MIT

Does @size-limit/preset-small-lib@13.0.3 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("@size-limit/preset-small-lib") from a CommonJS file and import "@size-limit/preset-small-lib" from an ES module.

Runtimerequire("@size-limit/preset-small-lib")import "@size-limit/preset-small-lib"
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 1.4.0✓ works✓ works

How to import @size-limit/preset-small-lib

ES modules (import)

import * as presetSmallLib from "@size-limit/preset-small-lib";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const presetSmallLib = require("@size-limit/preset-small-lib");

// Any Node.js version the package supports, from an async function:
async function main() {
  const presetSmallLib = await import("@size-limit/preset-small-lib");
}

// Or pin the last CommonJS release:
// npm install @size-limit/preset-small-lib@9.0.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (108 versions; the newest 60 shown).

VersionsFormatFirst published
10.0.0 – 13.0.3ESM-onlyOct 23, 2023
4.10.0 – 9.0.0CommonJSMar 4, 2021

Frequently asked

Is @size-limit/preset-small-lib ESM-only?

@size-limit/preset-small-lib@13.0.3 is ESM-only. @size-limit/preset-small-lib dropped its CommonJS build in 10.0.0 (October 2023). The last version with a plain require()-able CommonJS entry is 9.0.0, published Sep 5, 2023.

Which version of @size-limit/preset-small-lib still supports CommonJS / require()?

9.0.0 is the last version of @size-limit/preset-small-lib with a CommonJS build. Install it with "npm install @size-limit/preset-small-lib@9.0.0". Every version from 10.0.0 on is ESM-only.

How do I use @size-limit/preset-small-lib from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const presetSmallLib = await import("@size-limit/preset-small-lib"). That works on every Node.js version the package supports. On Node.js 20.19+, 22.12+ and newer, require("@size-limit/preset-small-lib") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin @size-limit/preset-small-lib@9.0.0.

Does @size-limit/preset-small-lib work in Bun?

Yes. import "@size-limit/preset-small-lib" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does @size-limit/preset-small-lib ship TypeScript types?

No. @size-limit/preset-small-lib ships no type declarations and there is no @types package for it.

Links

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