dependencies:
  go_router: ^4.4.1

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      routeInformationProvider: _router.routeInformationProvider,
      routeInformationParser: _router.routeInformationParser,
      routerDelegate: _router.routerDelegate,
    );
  }
}

final GoRouter _router = GoRouter(
  routes: <GoRoute>[
    GoRoute(
      path: '/',
      builder: (BuildContext context, GoRouterState state) {
        return const HomePage();
      },
    ),
    GoRoute(
      path: '/user',
      builder: (BuildContext context, GoRouterState state) {
        return const UserPage();
      },
    ),
  ],
);

class HomePage extends StatelessWidget {
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text(
          'HomePage',
        ),
      ),
      body: Padding(
        padding: const EdgeInsets.all(8.0),
        child: ElevatedButton(
          child: const Text('UserPageへ'),
          onPressed: () => context.go("/user"),
        ),
      ),
    );
  }
}

class UserPage extends StatelessWidget {
  const UserPage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text(
          'UserPage',
        ),
      ),
      body: Padding(
        padding: const EdgeInsets.all(8.0),
        child: ElevatedButton(
          style: ElevatedButton.styleFrom(backgroundColor: Colors.red),
          child: const Text('HomePageへ'),
          onPressed: () => context.go("/"),
        ),
      ),
    );
  }
}