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Is @csstools/css-parser-algorithms ESM-only? Can you require() it?

Algorithms to help you parse CSS from an array of tokens.

Last verified Sep 9, 2026 against @csstools/css-parser-algorithms@4.0.0. JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.0.5

@csstools/css-parser-algorithms dropped its CommonJS build in 4.0.0 (January 2026). The last version you can require() on every Node.js version, including 18 and older, is 3.0.5, published May 27, 2025.

On Node.js 20.19+, 22.12+ and every newer release, require("@csstools/css-parser-algorithms") 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.

@csstools/css-parser-algorithms@4.0.0 declares engines ">=20.19.0", so Node.js 18 is outside its supported range regardless of module format.

Latest
4.0.0 (Jan 14, 2026)
Module format
ESM-only
Last CommonJS version
3.0.5
ESM-only since
4.0.0 (Jan 14, 2026)
TypeScript types
Bundled
Node engines
>=20.19.0
Weekly downloads
68.0M
License
MIT

Does @csstools/css-parser-algorithms@4.0.0 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("@csstools/css-parser-algorithms") from a CommonJS file and import "@csstools/css-parser-algorithms" from an ES module.

Runtimerequire("@csstools/css-parser-algorithms")import "@csstools/css-parser-algorithms"
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 @csstools/css-parser-algorithms

ES modules (import)

import cssParserAlgorithms from "@csstools/css-parser-algorithms";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const cssParserAlgorithms = require("@csstools/css-parser-algorithms");

// Any Node.js version:
const cssParserAlgorithms = await import("@csstools/css-parser-algorithms");

// Or pin the last CommonJS release:
// npm install @csstools/css-parser-algorithms@3.0.5

Module format by version

Derived from the type, main and exports fields of every stable release on npm (24 versions; the newest 24 shown).

VersionsFormatFirst published
4.0.0ESM-onlyJan 14, 2026
1.0.0 – 3.0.5Dual (CommonJS + ESM)Nov 14, 2022

Frequently asked

Is @csstools/css-parser-algorithms ESM-only?

@csstools/css-parser-algorithms@4.0.0 is ESM-only. @csstools/css-parser-algorithms dropped its CommonJS build in 4.0.0 (January 2026). The last version you can require() on every Node.js version, including 18 and older, is 3.0.5, published May 27, 2025.

Which version of @csstools/css-parser-algorithms still supports CommonJS / require()?

3.0.5 is the last version of @csstools/css-parser-algorithms with a CommonJS build. Install it with "npm install @csstools/css-parser-algorithms@3.0.5". Every version from 4.0.0 on is ESM-only.

How do I use @csstools/css-parser-algorithms from a CommonJS file?

Use a dynamic import: const mod = await import("@csstools/css-parser-algorithms"). On Node.js 20.19+, 22.12+ and newer, a plain require("@csstools/css-parser-algorithms") also works for ESM packages that do not use top-level await. Alternatively pin @csstools/css-parser-algorithms@3.0.5.

Does @csstools/css-parser-algorithms work in Bun?

Yes. import "@csstools/css-parser-algorithms" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @csstools/css-parser-algorithms ship TypeScript types?

Yes. @csstools/css-parser-algorithms bundles its own type declarations; no @types package is needed.

Links

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