main.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:zchat/services/register_providers.dart';

import 'views/auth/login.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: registerProviders,
      child: MaterialApp(
        title: 'ZChat',
        theme: ThemeData(
          primarySwatch: Colors.blue,
          visualDensity: VisualDensity.adaptivePlatformDensity,
        ),
        home: Login(),
      ),
    );
  }
}

register_providers.dart

import 'package:provider/provider.dart';
import 'package:provider/single_child_widget.dart';
import 'package:zchat/view_models/home_vm.dart';
import 'package:zchat/view_models/login_vm.dart';
import 'package:zchat/view_models/signup_vm.dart';

final registerProviders = <SingleChildWidget>[
  ChangeNotifierProvider(create: (_) => HomeViewModel()),
  ChangeNotifierProvider(create: (_) => LoginViewModel()),
  ChangeNotifierProvider(create: (_) => SignupViewModel()),
];