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Is @csstools/color-helpers ESM-only? Can you require() it?

Color helpers to ease transformation between formats, gamut, etc

Last verified Sep 9, 2026 against @csstools/color-helpers@6.1.1. JSON

ESM-only ESM-only since 6.0.0 — last CommonJS version is 5.1.0

@csstools/color-helpers dropped its CommonJS build in 6.0.0 (January 2026). The last version you can require() on every Node.js version, including 18 and older, is 5.1.0, published Aug 22, 2025.

On Node.js 20.19+, 22.12+ and every newer release, require("@csstools/color-helpers") 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/color-helpers@6.1.1 declares engines ">=20.19.0", so Node.js 18 is outside its supported range regardless of module format.

Latest
6.1.1 (Aug 15, 2026)
Module format
ESM-only
Last CommonJS version
5.1.0
ESM-only since
6.0.0 (Jan 14, 2026)
TypeScript types
Bundled
Node engines
>=20.19.0
License
MIT-0

Does @csstools/color-helpers@6.1.1 actually load? Runtime test results

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

Runtimerequire("@csstools/color-helpers")import "@csstools/color-helpers"
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/color-helpers

ES modules (import)

import colorHelpers from "@csstools/color-helpers";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const colorHelpers = require("@csstools/color-helpers");

// Any Node.js version:
const colorHelpers = await import("@csstools/color-helpers");

// Or pin the last CommonJS release:
// npm install @csstools/color-helpers@5.1.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (19 versions; the newest 19 shown).

VersionsFormatFirst published
6.0.0 – 6.1.1ESM-onlyJan 14, 2026
1.0.0 – 5.1.0Dual (CommonJS + ESM)Feb 2, 2023

Frequently asked

Is @csstools/color-helpers ESM-only?

@csstools/color-helpers@6.1.1 is ESM-only. @csstools/color-helpers dropped its CommonJS build in 6.0.0 (January 2026). The last version you can require() on every Node.js version, including 18 and older, is 5.1.0, published Aug 22, 2025.

Which version of @csstools/color-helpers still supports CommonJS / require()?

5.1.0 is the last version of @csstools/color-helpers with a CommonJS build. Install it with "npm install @csstools/color-helpers@5.1.0". Every version from 6.0.0 on is ESM-only.

How do I use @csstools/color-helpers from a CommonJS file?

Use a dynamic import: const mod = await import("@csstools/color-helpers"). On Node.js 20.19+, 22.12+ and newer, a plain require("@csstools/color-helpers") also works for ESM packages that do not use top-level await. Alternatively pin @csstools/color-helpers@5.1.0.

Does @csstools/color-helpers work in Bun?

Yes. import "@csstools/color-helpers" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @csstools/color-helpers ship TypeScript types?

Yes. @csstools/color-helpers bundles its own type declarations; no @types package is needed.

Links

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