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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. 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 you can require() on every Node.js version, including 18 and older, is 9.0.0, published Sep 5, 2023.

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

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
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✓ works✓ works

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

ES modules (import)

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

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const presetSmallLib = require("@size-limit/preset-small-lib");

// Any Node.js version:
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 (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 you can require() on every Node.js version, including 18 and older, 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?

Use a dynamic import: const mod = await import("@size-limit/preset-small-lib"). On Node.js 20.19+, 22.12+ and newer, a plain require("@size-limit/preset-small-lib") also works for ESM packages that do not use top-level await. 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 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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