Makes vs/nls.availableLanguages work for AMD again.

src/nls-fix.js

@@ -0,0 +1,39 @@
+/* This fix ensures that old nls-plugin configurations are still respected by the new localization solution. */
+/* We should try to avoid this file and find a different solution.  */
+/* Warning: This file still has to work when replacing "\n" with " "! */
+
+/**
+ * @type {typeof define}
+ */
+const globalDefine = globalThis.define;
+globalDefine('vs/nls.messages-loader', [], function (...args) {
+	return {
+		load: (name, req, load, config) => {
+			const requestedLanguage = config['vs/nls']?.availableLanguages?.['*'];
+			if (!requestedLanguage || requestedLanguage === 'en') {
+				load({});
+			} else {
+				req([`vs/nls.messages.${requestedLanguage}`], () => {
+					load({});
+				});
+			}
+		}
+	};
+});
+globalDefine(
+	'vs/nls.messages',
+	['require', 'exports', 'vs/nls.messages-loader!'],
+	function (require, exports) {
+		Object.assign(exports, {
+			getNLSMessages: () => globalThis._VSCODE_NLS_MESSAGES,
+			getNLSLanguage: () => globalThis._VSCODE_NLS_LANGUAGE
+		});
+	}
+);
+define = function (...args) {
+	if (args.length > 0 && args[0] === 'vs/nls.messages') {
+		return;
+	}
+	return globalDefine(...args);
+};
+define.amd = true;