webpack: Resolve asset watching not compiling

- Conditionally set 'cache' based on environment, enabled in production and disabled otherwise
- Added exclusion of node_modules in watchOptions to improve watch performance.

invenio_assets/assets/build/webpack.config.js

@@ -3,6 +3,7 @@
  * Copyright (C) 2017-2018 CERN.
  * Copyright (C) 2022-2023 Graz University of Technology.
  * Copyright (C) 2023      TU Wien.
+ * Copyright (C) 2023      KTH Royal Institute of Technology.
  *
  * Invenio is free software; you can redistribute it and/or modify it
  * under the terms of the MIT License; see LICENSE file for more details.
@@ -207,7 +208,7 @@ var webpackConfig = {
       filename: "css/[name].[contenthash].css",
       chunkFilename: "css/[name].[contenthash].css",
     }),
-    // Removes the dist folder before each run.
+// Removes the dist folder before each run.
     new CleanWebpackPlugin({
       dry: false,
       verbose: false,
@@ -251,7 +252,9 @@ var webpackConfig = {
   },
   watchOptions: {
     followSymlinks: true,
+    ignored: "**/node_modules",
   },
+  cache: process.env.NODE_ENV === "production" ? true : false,
 };
 
 if (process.env.npm_config_report) {