update

wp-content/plugins/youtube-feed-pro/vendor/smashballoon/customizer/webpack.config.js

@@ -0,0 +1,36 @@
+const path = require('path');
+
+module.exports = {
+    mode: "production",
+    entry: {
+        builder: "./assets/js/builder.js",
+        main: "./assets/js/main.js"
+    },
+    output: {
+        path: path.resolve(__dirname, 'assets/js'),
+        filename: '[name].min.js',
+        sourceMapFilename: '[name].js.map'
+    },
+    devtool: 'inline-source-map',
+    devServer: {
+        static: './assets/js',
+        host: 'localhost',
+        hot: true,
+        allowedHosts: ['all'],
+        port: 8089
+    },
+    module: {
+        rules: [
+            {
+                test: /\.m?js$/,
+                exclude: /(node_modules|bower_components)/,
+                use: {
+                    loader: 'babel-loader',
+                    options: {
+                        presets: ['@babel/preset-env']
+                    }
+                }
+            }
+        ]
+    }
+};