flutter/packages/flutter_tools/templates/module/common/lib/main.dart.tmpl

import 'dart:async';
import 'dart:ui';

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

Future<void> main() async {
  final PackageInfo packageInfo = await PackageInfo.fromPlatform();
  runApp(Directionality(textDirection: TextDirection.ltr, child: Router(packageInfo)));
}

class Router extends StatelessWidget {
  Router(this.packageInfo);

  final PackageInfo packageInfo;

  @override
  Widget build(BuildContext context) {
    final String route = window.defaultRouteName;
    switch (route) {
      case 'route1':
        return Container(
          child: Center(child: Text('Route 1\n${packageInfo.appName}')),
          color: Colors.green,
        );
      case 'route2':
        return Container(
          child: Center(child: Text('Route 2\n${packageInfo.packageName}')),
          color: Colors.blue,
        );
      default:
        return Container(
          child: Center(child: Text('Unknown route: $route')),
          color: Colors.red,
        );
    }
  }
}