Update publicPath output to either use environment variable provided by developer building or default to '/' to avoid broken builds on Windows.

webpack/development.ts

@@ -109,6 +109,7 @@ const configuration: Configuration = {
 
   output: {
     pathinfo: true,
+    publicPath: process.env.FE_SUBDIRECTORY || '/',
   },
 
   watchOptions: Object.assign(

webpack/production.ts

@@ -25,6 +25,7 @@ const configuration: Configuration = {
     filename: 'packs/js/[name]-[chunkhash].js',
     chunkFilename: 'packs/js/[name]-[chunkhash].chunk.js',
     hotUpdateChunkFilename: 'packs/js/[id]-[contenthash].hot-update.js',
+    publicPath: process.env.FE_SUBDIRECTORY || '/',
   },
 
   optimization: {