clean install

web/themes/gin/webpack.config.dev.js

@@ -0,0 +1,14 @@
+const { merge } = require('webpack-merge');
+const webpackConfig = require('./webpack.config');
+const SourceMapDevToolPlugin = require('webpack/lib/SourceMapDevToolPlugin');
+
+module.exports = merge(webpackConfig, {
+  mode: 'development',
+  devtool: 'eval-cheap-module-source-map',
+  plugins: [
+    new SourceMapDevToolPlugin({
+      filename: '[file].map',
+      exclude: [/node_modules/, /images/, /spritemap/, /svg-sprites/],
+    })
+  ]
+});