Fix project loading on Windows

packages/tailwindcss-language-server/src/project-locator.ts

@@ -15,6 +15,7 @@ import { CacheMap } from './cache-map'
 import { getPackageRoot } from './util/get-package-root'
 import resolveFrom from './util/resolveFrom'
 import { Feature, supportedFeatures } from './features'
+import { pathToFileURL } from 'node:url'
 
 export interface ProjectConfig {
   /** The folder that contains the project */
@@ -406,6 +407,7 @@ async function* contentSelectorsFromCssConfig(entry: ConfigEntry): AsyncIterable
 async function* detectContentFiles(base: string): AsyncIterable<string> {
   try {
     let oxidePath = resolveFrom(path.dirname(base), '@tailwindcss/oxide')
+    oxidePath = pathToFileURL(oxidePath).href
 
     // This isn't a v4 project
     const oxide = await import(oxidePath)

packages/tailwindcss-language-server/src/projects.ts

@@ -79,6 +79,7 @@ import { loadDesignSystem } from './util/v4'
 import { readCssFile } from './util/css'
 import type { AstNode } from 'tailwindcss-language-service/src/util/v4'
 import * as postcss8 from 'postcss'
+import { pathToFileURL } from 'url'
 
 const colorNames = Object.keys(namedColors)
 
@@ -419,14 +420,15 @@ export async function createProjectService(
     let applyComplexClasses: any
 
     try {
-      const tailwindcssPath = resolveFrom(configDir, 'tailwindcss')
+      let tailwindcssPath = resolveFrom(configDir, 'tailwindcss')
       const tailwindcssPkgPath = resolveFrom(configDir, 'tailwindcss/package.json')
       const tailwindDir = path.dirname(tailwindcssPkgPath)
       tailwindcssVersion = require(tailwindcssPkgPath).version
 
       let features = supportedFeatures(tailwindcssVersion)
       log(`supported features: ${JSON.stringify(features)}`)
 
+      tailwindcssPath = pathToFileURL(tailwindcssPath).href
       tailwindcss = await import(tailwindcssPath)
       tailwindcss = tailwindcss.default ?? tailwindcss
       log(`Loaded tailwindcss v${tailwindcssVersion}: ${tailwindDir}`)