react-native-firebase/docs/usage.md

Usage

After creating a Firebase project and installing the library, we can use it in our project by importing the library in our JavaScript:

import RNFirebase from 'react-native-firebase'

We need to tell the Firebase library we want to configure the project. RNFirebase provides a way to configure both the native and the JavaScript side of the project at the same time with a single command:

const firebase = RNFirebase.initializeApp({
  // config options
});

Configuration Options

option	type	Default Value	Description
debug	bool	false	When set to true, RNFirebase will log messages to the console and fire debug events we can listen to in js
persistence	bool	false	When set to true, database persistence will be enabled.
errorOnMissingPlayServices	bool	true	(Android only) When set to true, will throw an error if Google Play Services isn't installed.
promptOnMissingPlayServices	bool	true	(Android only) When set to true, will prompt the user to install Google Play Services if it isn't installed. This takes precedence over errorOnMissingPlayServices.

For instance:

import RNFirebase from 'react-native-firebase';

const configurationOptions = {
  debug: true
};

const firebase = RNFirebase.initializeApp(configurationOptions);

export default firebase;