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42 lines
1.8 KiB
Plaintext
42 lines
1.8 KiB
Plaintext
---
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title: useLightningcss
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description: Enable experimental support for Lightning CSS.
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version: experimental
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---
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Experimental support for using [Lightning CSS](https://lightningcss.dev) with webpack. Lightning CSS is a fast CSS transformer and minifier, written in Rust.
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If this option is not set, Next.js on webpack uses [PostCSS](https://postcss.org/) with [`postcss-preset-env`](https://www.npmjs.com/package/postcss-preset-env) by default.
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Turbopack uses Lightning CSS by default since Next 14.2. This configuration option has no effect on Turbopack. Turbopack always uses Lightning CSS.
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```ts filename="next.config.ts" switcher
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import type { NextConfig } from 'next'
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const nextConfig: NextConfig = {
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experimental: {
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useLightningcss: false, // default, ignored on Turbopack
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},
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}
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export default nextConfig
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```
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```js filename="next.config.js" switcher
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/** @type {import('next').NextConfig} */
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const nextConfig = {
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experimental: {
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useLightningcss: true, // disables PostCSS on webpack
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},
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}
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module.exports = nextConfig
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```
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## Version History
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| Version | Changes |
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| -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `15.1.0` | Support for `useSwcCss` was removed from Turbopack. |
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| `14.2.0` | Turbopack's default CSS processor was changed from `@swc/css` to Lightning CSS. `useLightningcss` became ignored on Turbopack, and a legacy `experimental.turbo.useSwcCss` option was added. |
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