feat(css): add more stricter typing of lightningcss

eslint.config.js

@@ -90,6 +90,7 @@ export default tseslint.config(
             'less',
             'sass',
             'sass-embedded',
+            'lightningcss',
             'vitest',
             'unbuild',
           ],

packages/vite/src/node/index.ts

@@ -219,7 +219,7 @@ export type { Terser } from 'dep-types/terser'
 export type { RollupCommonJSOptions } from 'dep-types/commonjs'
 export type { RollupDynamicImportVarsOptions } from 'dep-types/dynamicImportVars'
 export type { Matcher, AnymatchPattern, AnymatchFn } from 'dep-types/anymatch'
-export type { LightningCSSOptions } from 'dep-types/lightningcss'
+export type { LightningCSSOptions } from 'types/internal/lightningcssOptions'
 
 // Backward compatibility
 export type { ModuleGraph, ModuleNode } from './server/mixedModuleGraph'

packages/vite/src/node/plugins/css.ts

@@ -21,7 +21,7 @@ import type Sass from 'sass'
 import type Stylus from 'stylus'
 import type Less from 'less'
 import type { Alias } from 'dep-types/alias'
-import type { LightningCSSOptions } from 'dep-types/lightningcss'
+import type { LightningCSSOptions } from 'types/internal/lightningcssOptions'
 import type { TransformOptions } from 'esbuild'
 import { formatMessages, transform } from 'esbuild'
 import type { RawSourceMap } from '@ampproject/remapping'
@@ -181,9 +181,7 @@ export interface CSSModulesOptions {
 }
 
 export type ResolvedCSSOptions = Omit<CSSOptions, 'lightningcss'> & {
-  lightningcss?: LightningCSSOptions & {
-    targets: LightningCSSOptions['targets']
-  }
+  lightningcss?: LightningCSSOptions
 }
 
 export function resolveCSSOptions(

packages/vite/types/internal/lightningcssOptions.d.ts

@@ -0,0 +1,18 @@
+/* eslint-disable @typescript-eslint/ban-ts-comment */
+
+// @ts-ignore `sass` may not be installed
+import type Lightningcss from 'lightningcss'
+
+/* eslint-enable @typescript-eslint/ban-ts-comment */
+
+export type LightningCSSOptions = Omit<
+  Lightningcss.BundleAsyncOptions<Lightningcss.CustomAtRules>,
+  | 'filename'
+  | 'resolver'
+  | 'minify'
+  | 'sourceMap'
+  | 'analyzeDependencies'
+  // properties not overridden by Vite, but does not make sense to set by end users
+  | 'inputSourceMap'
+  | 'projectRoot'
+>