feat(editors/vscode): update VSCode extention to use project's language server (#6132)

closes #3426

Author: shulaoda

editors/vscode/.prettierrc

@@ -1,3 +1,5 @@
+import { promises as fsPromises } from 'node:fs';
+
 import {
   commands,
   ConfigurationTarget,
@@ -90,10 +92,45 @@ export async function activate(context: ExtensionContext) {
   const outputChannel = window.createOutputChannel(outputChannelName);
   const traceOutputChannel = window.createOutputChannel(traceOutputChannelName);
 
-  const ext = process.platform === 'win32' ? '.exe' : '';
-  // NOTE: The `./target/release` path is aligned with the path defined in .github/workflows/release_vscode.yml
-  const command = process.env.SERVER_PATH_DEV ??
-    join(context.extensionPath, `./target/release/oxc_language_server${ext}`);
+  async function findBinary(): Promise<string> {
+    const cfg = workspace.getConfiguration('oxc');
+
+    let bin = cfg.get<string>('binPath', '');
+    if (bin) {
+      try {
+        await fsPromises.access(bin);
+        return bin;
+      } catch {}
+    }
+
+    const workspaceFolders = workspace.workspaceFolders;
+    if (workspaceFolders) {
+      try {
+        return await Promise.any(
+          workspaceFolders.map(async (folder) => {
+            const binPath = join(
+              folder.uri.fsPath,
+              'node_modules',
+              '.bin',
+              'oxc_language_server',
+            );
+
+            await fsPromises.access(binPath);
+            return binPath;
+          }),
+        );
+      } catch {}
+    }
+
+    const ext = process.platform === 'win32' ? '.exe' : '';
+    // NOTE: The `./target/release` path is aligned with the path defined in .github/workflows/release_vscode.yml
+    return (
+      process.env.SERVER_PATH_DEV ??
+        join(context.extensionPath, `./target/release/oxc_language_server${ext}`)
+    );
+  }
+
+  const command = await findBinary();
   const run: Executable = {
     command: command!,
     options: {

editors/vscode/client/extension.ts

@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
     "module": "commonjs",
-    "target": "es2020",
-    "lib": ["ES2020"],
+    "target": "es2021",
+    "lib": ["ES2021"],
     "outDir": "dist",
     "rootDir": "client",
     "sourceMap": true,