Merge pull request #928 from tommedema/no-duplicate-dev-js

prevent grapes.js from being injected twice during development

webpack.config.js

@@ -24,7 +24,7 @@ module.exports = env => {
     const index = 'index.html';
     const indexDev = `_${index}`;
     const template = fs.existsSync(indexDev) ? indexDev : index;
-    plugins.push(new HtmlWebpackPlugin({ template }));
+    plugins.push(new HtmlWebpackPlugin({ template, inject: false }));
   }
 
   plugins.push(new webpack.ProvidePlugin({