canirequire

canirequire › ESM-only › @csstools/css-calc

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

Solve CSS math expressions

Last verified Sep 9, 2026 against @csstools/css-calc@3.3.0. JSON

ESM-only ESM-only since 3.0.0 — last CommonJS version is 2.1.4

@csstools/css-calc dropped its CommonJS build in 3.0.0 (January 2026). The last version you can require() on every Node.js version, including 18 and older, is 2.1.4, published May 27, 2025.

On Node.js 20.19+, 22.12+ and every newer release, require("@csstools/css-calc") 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-calc@3.3.0 declares engines ">=20.19.0", so Node.js 18 is outside its supported range regardless of module format.

Latest
3.3.0 (Jul 22, 2026)
Module format
ESM-only
Last CommonJS version
2.1.4
ESM-only since
3.0.0 (Jan 14, 2026)
TypeScript types
Bundled
Node engines
>=20.19.0
License
MIT

Does @csstools/css-calc@3.3.0 actually load? Runtime test results

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

Runtimerequire("@csstools/css-calc")import "@csstools/css-calc"
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-calc

ES modules (import)

import cssCalc from "@csstools/css-calc";

CommonJS (require)

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

// Any Node.js version:
const cssCalc = await import("@csstools/css-calc");

// Or pin the last CommonJS release:
// npm install @csstools/css-calc@2.1.4

Module format by version

Derived from the type, main and exports fields of every stable release on npm (32 versions; the newest 32 shown).

VersionsFormatFirst published
3.0.0 – 3.3.0ESM-onlyJan 14, 2026
1.0.0 – 2.1.4Dual (CommonJS + ESM)Feb 21, 2023

Frequently asked

Is @csstools/css-calc ESM-only?

@csstools/css-calc@3.3.0 is ESM-only. @csstools/css-calc dropped its CommonJS build in 3.0.0 (January 2026). The last version you can require() on every Node.js version, including 18 and older, is 2.1.4, published May 27, 2025.

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

2.1.4 is the last version of @csstools/css-calc with a CommonJS build. Install it with "npm install @csstools/css-calc@2.1.4". Every version from 3.0.0 on is ESM-only.

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

Use a dynamic import: const mod = await import("@csstools/css-calc"). On Node.js 20.19+, 22.12+ and newer, a plain require("@csstools/css-calc") also works for ESM packages that do not use top-level await. Alternatively pin @csstools/css-calc@2.1.4.

Does @csstools/css-calc work in Bun?

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

Does @csstools/css-calc ship TypeScript types?

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

Links

Other esm-only packages

Similar popularity