https://medium.com/@phylypo/basic-step-by-step-react-native-tutorial-7ea9597d29b9

import React from 'react';                                                                                                              import { Button, StyleSheet, Text, View } from 'react-native';

The class Button,StyleSheet, Text and View inside the curly brackets “{}” are classes without default export.

On the other hand React has a default export so we don’t need the bracket.