add path for loaders too, by Jishnu

debian/patches/add-system-lib-path-for-webpack.patch

@@ -8,3 +8,16 @@
      alias: {
        '~':              path.join(ROOT_PATH, 'app/assets/javascripts'),
        'emojis':         path.join(ROOT_PATH, 'fixtures/emojis'),
+@@ -254,7 +255,12 @@
+       'vendor':         path.join(ROOT_PATH, 'vendor/assets/javascripts'),
+       'vue$':           'vue/dist/vue.esm.js',
+     }
++  },
++
++  resolveLoader: {
++    modules: ['/usr/share/gitlab/node_modules', '/usr/lib/nodejs'],
+   }
++
+ }
+ 
+ if (IS_PRODUCTION) {