App.js

import React from 'react';
import ClientDetail from './screens/ClientDetail';
import AddClient from './screens/AddClient';
import ClientList from './screens/ClientList';
import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';

const Stack = createStackNavigator();

function MyStack() {
  return (
    <Stack.Navigator
      screenOptions={{ headerShown: false }}
      initialRouteName="ClientList">
      <Stack.Screen name="ClientDetail" component={ClientDetail} />
      <Stack.Screen name="AddClient" component={AddClient} />
      <Stack.Screen name="ClientList" component={ClientList} />
    </Stack.Navigator>
  );
}

export default function App() {
  return (
    <NavigationContainer>
      <MyStack />
    </NavigationContainer>
  );
}