Changed from

src/Router.ts

@@ -87,7 +87,12 @@ export class Router {
         }
         
         // Load the file as a module
-        const controllerModule = require(controllerPath);
+        const moduleNamespace = await import(controllerPath);
+
+        // When you import() a file, you get a "Module Namespace Object".
+        // If the file used 'module.exports = Class' or 'export default Class',
+        // your class is now inside the '.default' property.
+        const controllerModule = moduleNamespace.default || moduleNamespace;
 
         logMessage(`${controllerPath} loaded successfully: ${JSON.stringify(Object.keys(controllerModule))} exports found.`, LogLevel.DEBUG);