diff --git a/arduino-ide-extension/src/browser/theia/core/default-window-service.ts b/arduino-ide-extension/src/browser/theia/core/default-window-service.ts
index c256e97a..2d318f5e 100644
--- a/arduino-ide-extension/src/browser/theia/core/default-window-service.ts
+++ b/arduino-ide-extension/src/browser/theia/core/default-window-service.ts
@@ -14,4 +14,8 @@ export class DefaultWindowService
   async isFirstWindow(): Promise<boolean> {
     return true;
   }
-}
\ No newline at end of file
+
+  close() {
+    console.log('close');
+  }
+}
diff --git a/browser-app/package.json b/browser-app/package.json
index 4f319bac..183f9d5a 100644
--- a/browser-app/package.json
+++ b/browser-app/package.json
@@ -25,6 +25,7 @@
       "@theia/cli": "1.41.0"
     },
     "scripts": {
+      "build:dev": "theia build --config webpack.config.js --mode development",
       "prepare": "theia build --mode development",
       "start": "theia start --plugins=local-dir:../plugins",
       "watch": "theia build --watch --mode development"
diff --git a/browser-app/webpack.config.js b/browser-app/webpack.config.js
index 38baa16f..4bf3b849 100644
--- a/browser-app/webpack.config.js
+++ b/browser-app/webpack.config.js
@@ -5,8 +5,8 @@
 // @ts-check
 const config = require('./gen-webpack.config.js');
 
-config.resolve.fallback['http'] = false;
-config.resolve.fallback['fs'] = false;
+config[0].resolve.fallback['http'] = false;
+config[0].resolve.fallback['fs'] = false;
 
 /**
  * Expose bundled modules on window.theia.moduleName namespace, e.g.