Mobx Test

LoginScreen.js

import React from 'react';
import { Button, Text, SafeAreaView } from 'react-native';
import { observable } from 'mobx';
import { observer } from 'mobx-react';

@observer export class LoginScreen extends React.Component {
  @observable count = 0;

  handleInc = () => this.count++; 
  handleDesc = () => this.count--; 

  render() {
    return (
      <SafeAreaView>
        <Button title=" + " onPress={this.handleInc}/>
        <Button title=" - " onPress={this.handleDesc}/>
        <Text style={{alignSelf:'center'}}>{this.count}</Text>
      </SafeAreaView>
    )
  }
}