react-native-firebase/packages/template/project/App.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 * @flow
 */

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

import FirebaseAnalytics from '@react-native-firebase/analytics';

const instructions = Platform.select({
  ios: 'Press Cmd+R to reload,\nCmd+D or shake for dev menu',
  android: 'Double tap R on your keyboard to reload,\nShake or press menu button for dev menu',
});

type Props = {};

export default class App extends Component<Props> {
  async componentDidMount() {
    await FirebaseAnalytics().setCurrentScreen('HomeScreen', 'RootView');
  }

  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>Welcome to React Native + Firebase!</Text>
        <Text style={styles.instructions}>To get started, edit App.js</Text>
        <Text style={styles.instructions}>{instructions}</Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});