feat: allow dev server port configuration from CLI

webpack.dev.js

@@ -1,16 +1,19 @@
 const merge = require('webpack-merge');
 const config = require('./webpack.config.js');
 
-module.exports = merge(config, {
+module.exports = (_env, argv) => {
-  mode: 'development',
+  const port = argv.port || 3001;
-  devServer: {
+  return merge(config, {
-    publicPath: '/dist/',
+    mode: 'development',
-    proxy: {
+    devServer: {
-      '/extensions': {
+      publicPath: '/dist/',
-        target: 'http://localhost:3001',
+      proxy: {
-        pathRewrite: { '^/extensions': '/public/extensions' }
+        '/extensions': {
-      }
+          target: `http://localhost:${port}`,
-    },
+          pathRewrite: { '^/extensions': '/public/extensions' }
-    port: 3001
+        }
-  }
+      },
-});
+      port,
+    }
+  });
+};