Use one server to handle all folders in a workspace (#957)

* Fix strict mode typescript errors

* Refactor

* Load user languages when booting

It makes more sense for our server to ask for them like we do all other config options rather than expecting them to be passed in during initialization

* Only start one server for all workspace folders

* Check all workspace folders when booting the server

This is a bit of a behavioral change but if _any_ folder in your current workspace might need the language server when we’ll boot it. We do still wait for an open document currently.

* Remove note

* Remove unused expect error directive

It’ll need to come back once I upgrade TypeScript

* Fix folder count check

* Run prettier

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"
   }