Fix JS and JS-based image upload

config/webpack/webpack.config.js

@@ -0,0 +1,21 @@
+const path    = require("path")
+const webpack = require("webpack")
+
+module.exports = {
+  mode: "production",
+  devtool: "source-map",
+  entry: {
+    application: "./app/javascript/application.js"
+  },
+  output: {
+    filename: "[name].js",
+    sourceMapFilename: "[file].map",
+    chunkFormat: "module",
+    path: path.resolve(__dirname, '..', '..', 'app/assets/builds')
+  },
+  plugins: [
+    new webpack.optimize.LimitChunkCountPlugin({
+      maxChunks: 1
+    })
+  ]
+}