add hw2

node_modules/langium/lib/languages/language-meta-data.d.ts

@@ -0,0 +1,20 @@
+/******************************************************************************
+ * Copyright 2021 TypeFox GmbH
+ * This program and the accompanying materials are made available under the
+ * terms of the MIT License, which is available in the project root.
+ ******************************************************************************/
+/**
+ * Metadata of a language.
+ */
+export interface LanguageMetaData {
+    languageId: string;
+    fileExtensions: readonly string[];
+    caseInsensitive: boolean;
+    /**
+     * Mode used to optimize code for development or production environments.
+     *
+     * In production mode, all Chevrotain lexer/parser validations are disabled.
+     */
+    mode: 'development' | 'production';
+}
+//# sourceMappingURL=language-meta-data.d.ts.map