App.js

import React from 'react';
import LoginScreen from './screens/LoginScreen';
import MainScreen from './screens/MainScreen';
import SignupScreen from './screens/SignUp';
import { createStackNavigator } from '@react-navigation/stack';
import { NavigationContainer } from '@react-navigation/native';

const Stack = createStackNavigator();

export default function App() {
  return (
    <NavigationContainer>
      <Stack.Navigator>
        <Stack.Screen name="Login" component={LoginScreen} />
        <Stack.Screen
          name="MainScreen"
          component={MainScreen}
          options={{ headerShown: false }}
        />
        <Stack.Screen name="Signup" component={SignupScreen} />
      </Stack.Navigator>
    </NavigationContainer>
  );
}