Enable verbatimModuleSyntax in tsconfig (#1936)

Author: kaisalmen

packages/langium/src/index.ts

@@ -23,4 +23,5 @@ export * from './workspace/index.js';
 // Export the Langium Grammar AST definitions in the `GrammarAST` namespace
 import * as GrammarAST from './languages/generated/ast.js';
 import type { Grammar } from './languages/generated/ast.js';
-export { Grammar, GrammarAST };
+export type { Grammar };
+export { GrammarAST };

tsconfig.json

@@ -46,7 +46,9 @@
     // Skip type checking of declaration files.
     "skipLibCheck": true,
     // This setting controls how TypeScript determines whether a file is a script or a module.
-    "moduleDetection": "force"
+    "moduleDetection": "force",
+    // any imports or exports without a type modifier are left around. Anything that uses the type modifier is dropped entirely.
+    "verbatimModuleSyntax": true
   },
   "include": [
      "**/src/**/*",