App.js

import React, { Component } from "react";

import "react-native-gesture-handler";
import { NavigationContainer } from "@react-navigation/native";
import { createStackNavigator } from "@react-navigation/stack";

import Start from "./components/Start";
import Chat from "./components/Chat";

// Create the navigator
const Stack = createStackNavigator();

export default class App extends Component {
	render() {
		return (
			<NavigationContainer>
				<Stack.Navigator initialRouteName="Start">
					<Stack.Screen name="Start" component={Start} />
					<Stack.Screen name="Chat" component={Chat} />
				</Stack.Navigator>
			</NavigationContainer>
		);
	}
}