Fix webpack

src/background/domains/Completions.js

@@ -19,9 +19,9 @@ export default class Completions {
     }));
   }
 
-  static EMPTY_COMPLETIONS = new Completions([]);
-
   static empty() {
-    return Completions.EMPTY_COMPLETIONS;
+    return EMPTY_COMPLETIONS;
   }
 }
+
+let EMPTY_COMPLETIONS = new Completions([]);

webpack.config.js

@@ -24,7 +24,7 @@ config = {
         exclude: /node_modules/,
         loader: 'babel-loader',
         query: {
-          presets: ['react', 'stage-2']
+          presets: ['@babel/react']
         }
       },
       {