fix: add nlsConfig to webWorker #192808

src/vs/base/worker/workerMain.ts

@@ -102,12 +102,27 @@
 		});
 	}
 
+	// stores the current language
+	let __locale__: string | undefined = undefined;
+
 	function configureAMDLoader() {
+		interface NLSConfig {
+			availableLanguages: { [key: string]: string };
+		}
+		const nlsConfig: { 'vs/nls'?: NLSConfig } = {};
+		if (__locale__ && __locale__ !== 'en') {
+			nlsConfig['vs/nls'] = {
+				availableLanguages: {
+					'*': __locale__,
+				},
+			};
+		}
 		require.config({
 			baseUrl: monacoBaseUrl,
 			catchError: true,
 			trustedTypesPolicy,
-			amdModulesPattern: /^vs\//
+			amdModulesPattern: /^vs\//,
+			...nlsConfig,
 		});
 	}
 
@@ -140,6 +155,14 @@
 	let isFirstMessage = true;
 	const beforeReadyMessages: MessageEvent[] = [];
 	globalThis.onmessage = (message: MessageEvent) => {
+		if (isFirstMessage && !__locale__) {
+			const locale = message.data?.match(/^worker:init-locale:(.+)$/);
+			if (locale?.[1]) {
+				__locale__ = locale[1];
+				return;
+			}
+		}
+
 		if (!isFirstMessage) {
 			beforeReadyMessages.push(message);
 			return;

src/vs/workbench/services/extensions/browser/webWorkerExtensionHost.ts

@@ -83,9 +83,10 @@ export class WebWorkerExtensionHost extends Disposable implements IExtensionHost
 		}
 		COI.addSearchParam(suffixSearchParams, true, true);
 
-		const suffix = `?${suffixSearchParams.toString()}`;
+		let suffix = `?${suffixSearchParams.toString()}`;
 
 		const iframeModulePath = 'vs/workbench/services/extensions/worker/webWorkerExtensionHostIframe.html';
+		const locale = localStorage.getItem('vscode.nls.locale') || navigator.language.toLowerCase();
 		if (platform.isWeb) {
 			const webEndpointUrlTemplate = this._productService.webEndpointUrlTemplate;
 			const commit = this._productService.commit;
@@ -109,12 +110,19 @@ export class WebWorkerExtensionHost extends Disposable implements IExtensionHost
 				const res = new URL(`${baseUrl}/out/${iframeModulePath}${suffix}`);
 				res.searchParams.set('parentOrigin', mainWindow.origin);
 				res.searchParams.set('salt', stableOriginUUID);
+				if (locale !== 'en') {
+					res.searchParams.set('locale', locale);
+				}
 				return res.toString();
 			}
 
 			console.warn(`The web worker extension host is started in a same-origin iframe!`);
 		}
 
+		if (locale !== 'en') {
+			suffixSearchParams.set('locale', locale);
+			suffix = `?${suffixSearchParams.toString()}`;
+		}
 		const relativeExtensionHostIframeSrc = FileAccess.asBrowserUri(iframeModulePath);
 		return `${relativeExtensionHostIframeSrc.toString(true)}${suffix}`;
 	}

src/vs/workbench/services/extensions/worker/webWorkerExtensionHostIframe.html

@@ -15,6 +15,7 @@
 	const name = searchParams.get('debugged') ? 'DebugWorkerExtensionHost' : 'WorkerExtensionHost';
 	const parentOrigin = searchParams.get('parentOrigin') || window.origin;
 	const salt = searchParams.get('salt');
+	const locale = searchParams.get('locale');
 
 	(async function () {
 		const hostnameValidationMarker = 'v--';
@@ -73,6 +74,10 @@
 			}
 
 			const worker = new Worker(workerUrl, { name });
+			if (locale) {
+				// send before `vs/workbench/api/worker/extensionHostWorker`load event.
+				worker.postMessage(`worker:init-locale:${locale}`);
+			}
 			worker.postMessage('vs/workbench/api/worker/extensionHostWorker');
 			const nestedWorkers = new Map();