Class.tsx

import React, { Component } from "react";
import { Text, View } from "react-native";

interface Props {
  
}

interface State {

}

class App extends Component<Props, State> {
  render() {
    return (
      <View>
        <Text>Hi, App Component!</Text>
      </View>
    );
  }
}

export default App;

Function.tsx

import React from "react";
import { Text, View } from "react-native";

interface Props {

}

const App = (props: Props) => {
  return (
    <View>
      <Text>Hi, App Component!</Text>
    </View>
  );
};

export default App;