Use Preact for local development too

next.config.js

@@ -1,8 +1,8 @@
 module.exports = {
   trailingSlash: true,
   webpack: (config, { dev, isServer }) => {
-    // Replace React with Preact only in client production build
-    if (!dev && !isServer) {
+    // Replace React with Preact only for client
+    if (!isServer) {
       Object.assign(config.resolve.alias, {
         react: 'preact/compat',
         'react-dom/test-utils': 'preact/test-utils',