Use one server to handle all folders in a workspace

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

@@ -26,7 +26,7 @@ let connection = createConnection(ProposedFeatures.all)
 interceptLogs(console, connection)
 
 process.on('unhandledRejection', (e: any) => {
-  console.error("Unhandled exception", e)
+  console.error('Unhandled exception', e)
 })
 
 let documents: TextDocuments<TextDocument> = new TextDocuments(TextDocument)

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

@@ -182,6 +182,7 @@ export async function createProjectService(
   watchPatterns: (patterns: string[]) => void,
   initialTailwindVersion: string,
   getConfiguration: (uri?: string) => Promise<Settings>,
+  userLanguages: Record<string, string>,
 ): Promise<ProjectService> {
   let enabled = false
   const folder = projectConfig.folder
@@ -206,9 +207,7 @@ export async function createProjectService(
     editor: {
       connection,
       folder,
-      userLanguages: params.initializationOptions?.userLanguages
-        ? params.initializationOptions.userLanguages
-        : {},
+      userLanguages,
       // TODO
       capabilities: {
         configuration: true,

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

@@ -42,7 +42,7 @@ import { equal } from '@tailwindcss/language-service/src/util/array'
 import { CONFIG_GLOB, CSS_GLOB, PACKAGE_LOCK_GLOB } from './lib/constants'
 import { clearRequireCache, isObject, changeAffectsFile } from './utils'
 import { DocumentService } from './documents'
-import { createProjectService, type ProjectService, DocumentSelectorPriority } from './projects'
+import { createProjectService, type ProjectService } from './projects'
 import { type SettingsCache, createSettingsCache } from './config'
 import { readCssFile } from './util/css'
 import { ProjectLocator, type ProjectConfig } from './project-locator'
@@ -163,6 +163,15 @@ export class TW {
     let globalSettings = await this.settingsCache.get()
     let ignore = globalSettings.tailwindCSS.files.exclude
 
+    // Get user languages for the given workspace folder
+    let folderSettings = await this.settingsCache.get(base)
+    let userLanguages = folderSettings.tailwindCSS.includeLanguages
+
+    // Fall back to settings defined in `initializationOptions` if invalid
+    if (!isObject(userLanguages)) {
+      userLanguages = this.initializeParams.initializationOptions?.userLanguages ?? {}
+    }
+
     let cssFileConfigMap: Map<string, string> = new Map()
     let configTailwindVersionMap: Map<string, string> = new Map()
 
@@ -489,6 +498,7 @@ export class TW {
           this.initializeParams,
           this.watchPatterns,
           configTailwindVersionMap.get(projectConfig.configPath),
+          userLanguages,
         ),
       ),
     )
@@ -604,6 +614,7 @@ export class TW {
     params: InitializeParams,
     watchPatterns: (patterns: string[]) => void,
     tailwindVersion: string,
+    userLanguages: Record<string, string>,
   ): Promise<void> {
     let key = String(this.projectCounter++)
     const project = await createProjectService(
@@ -627,6 +638,7 @@ export class TW {
       (patterns: string[]) => watchPatterns(patterns),
       tailwindVersion,
       this.settingsCache.get,
+      userLanguages,
     )
     this.projects.set(key, project)
 

packages/tailwindcss-language-server/tests/fixtures/v4/workspaces/package.json

@@ -1,5 +1,7 @@
 {
-  "workspaces": ["packages/*"],
+  "workspaces": [
+    "packages/*"
+  ],
   "dependencies": {
     "tailwindcss": "^4.0.0-alpha.12"
   }