Add webpack for external frontend libraries.

webpack.config.js

@@ -0,0 +1,20 @@
+/** @type {import('webpack').Configuration} */
+export const publicLibConfig = {
+    mode: 'production',
+    entry: './public/lib.js',
+    cache: true,
+    devtool: 'source-map',
+    module: {
+        rules: [{
+            test: /\.js$/,
+            exclude: /node_modules/,
+        }],
+    },
+    experiments: {
+        outputModule: true,
+    },
+    output: {
+        filename: 'lib.js',
+        libraryTarget: 'module',
+    },
+};