canirequire › Dual (CommonJS + ESM) › lightningcss
Is lightningcss ESM-only? Can you require() it?
A CSS parser, transformer, and minifier written in Rust
Last verified Sep 9, 2026 against lightningcss@1.33.0. JSON
Dual (CommonJS + ESM) Dual package — both require() and import work
lightningcss publishes both a CommonJS entry and a native ESM entry (ESM added in 1.14.0). require("lightningcss") and import "lightningcss" both work on every supported Node.js version and in Bun.
Does lightningcss@1.33.0 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("lightningcss") from a CommonJS file and import "lightningcss" from an ES module.
| Runtime | require("lightningcss") | import "lightningcss" |
|---|---|---|
| Node.js 18 | ✓ works | ✓ 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 lightningcss
ES modules (import)
import lightningcss from "lightningcss";CommonJS (require)
const lightningcss = require("lightningcss");Module format by version
Derived from the type, main and exports fields of every stable release on npm (43 versions; the newest 43 shown).
| Versions | Format | First published |
|---|---|---|
| 1.14.0 – 1.33.0 | Dual (CommonJS + ESM) | Sep 8, 2022 |
| 0.0.0 | CommonJS | Aug 22, 2022 |
Frequently asked
Is lightningcss ESM-only?
lightningcss@1.33.0 ships CommonJS and ESM builds. lightningcss publishes both a CommonJS entry and a native ESM entry (ESM added in 1.14.0). require("lightningcss") and import "lightningcss" both work on every supported Node.js version and in Bun.
Can I require lightningcss?
Yes. lightningcss ships a CommonJS entry, so require("lightningcss") works on every Node.js version, alongside the native ESM entry for import.
Does lightningcss work in Bun?
Yes. import "lightningcss" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does lightningcss ship TypeScript types?
Yes. lightningcss bundles its own type declarations; no @types package is needed.
Links
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