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Is size-limit ESM-only? Can you require() it?

CLI tool for Size Limit

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

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

size-limit 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; it declares support for Node.js ^18.0.0 || >=20.0.0.

On Node.js 22.12+ and newer (size-limit@13.0.3 declares Node.js ^22.18.0 || ^24.0.0 || >=26.0.0), require("size-limit") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26. Node.js 18 has no require(esm), and size-limit@13.0.3 declares Node.js ^22.18.0 || ^24.0.0 || >=26.0.0, so 18 is outside its supported range anyway.

size-limit@13.0.3 declares engines "^22.18.0 || ^24.0.0 || >=26.0.0", so Node.js 18, 20 are outside its supported range regardless of module format.

What to do

  1. On Node.js 22.12+ and newer (size-limit@13.0.3 declares Node.js ^22.18.0 || ^24.0.0 || >=26.0.0), require("size-limit") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const sizeLimit = await import("size-limit"). That works on every Node.js version the package supports (^22.18.0 || ^24.0.0 || >=26.0.0).
  3. If you need a synchronous require() or run Node.js 18: npm install size-limit@9.0.0, the last CommonJS release (published Sep 5, 2023); it declares Node.js ^18.0.0 || >=20.0.0.
  4. size-limit@13.0.3 declares engines "^22.18.0 || ^24.0.0 || >=26.0.0", so Node.js 18, 20 are unsupported regardless: upgrade Node.js or pin an older release.
  5. TypeScript: types are bundled; install nothing extra.
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
Bundled
Node engines
^22.18.0 || ^24.0.0 || >=26.0.0
Weekly downloads
1.2M
License
MIT

Does size-limit@13.0.3 actually load? Runtime test results

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

Runtimerequire("size-limit")import "size-limit"
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

ES modules (import)

import * as sizeLimit from "size-limit";

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

CommonJS (require)

// Node.js 22.12+ and newer (verified):
const sizeLimit = require("size-limit");

// Any Node.js version the package supports (^22.18.0 || ^24.0.0 || >=26.0.0), from an async function:
async function main() {
  const sizeLimit = await import("size-limit");
}

// Or pin the last CommonJS release (declares Node.js ^18.0.0 || >=20.0.0):
// npm install size-limit@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 (183 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 ESM-only?

size-limit@13.0.3 is ESM-only. size-limit 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; it declares support for Node.js ^18.0.0 || >=20.0.0.

Which version of size-limit still supports CommonJS / require()?

9.0.0 is the last version of size-limit with a CommonJS build; it declares Node.js ^18.0.0 || >=20.0.0. Install it with "npm install size-limit@9.0.0". Every version from 10.0.0 on is ESM-only.

How do I use size-limit from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const sizeLimit = await import("size-limit"). That works on every Node.js version the package supports (^22.18.0 || ^24.0.0 || >=26.0.0). On Node.js 22.12+ and newer (size-limit@13.0.3 declares Node.js ^22.18.0 || ^24.0.0 || >=26.0.0), require("size-limit") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 22, 24 and 26. Alternatively pin size-limit@9.0.0 (declares Node.js ^18.0.0 || >=20.0.0).

Does size-limit work in Bun?

Yes. import "size-limit" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does size-limit ship TypeScript types?

Yes. size-limit bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

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