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This gist will show you how to install and use React from Pods.

Podfile

target 'yourAppNameHere' do

  pod "Yoga", :path => "../node_modules/react-native/ReactCommon/yoga"
  pod 'React', :path => '../node_modules/react-native', :subspecs => [
    'BatchedBridge', # Required For React Native 0.45.0+
 'Core',

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// All necessary imports 

class AppAuthScreen extends Component {
  
  async componentDidMount() {
    const { navigation } = this.props;
    
    const currentEmail = await AsyncStorage.getItem(
      '@footballApp:currentEmail' // key used to save email during user singup
    );

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// @flow

import firebase from 'react-native-firebase';

export const DB = firebase.firestore();

export const USER_COLLECTION = 'users'; // name of collection in Firestore

export async function createUserDataBaseEntry(userId: string) {
  // creating a new transaction

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import com.facebook.react.ReactActivity;

public class MainActivity extends ReactActivity {
  
    @Override
    protected String getMainComponentName() {
        return "kotlin_app";
    }
}

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import com.facebook.react.ReactActivity

class MainActivity : ReactActivity() {

    override fun getMainComponentName(): String? {
        return "kotlin_app"
    }
}

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//...

apply plugin: "kotlin-android" // apply plugin


dependencies {
    // ...
    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" // add dependency
}
// ...

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/*
  Variables
  
    - Must be initialized with value
    - Can be either immutable or mutable
    - Can be null, but need to be declared with nullable type (more later)
    - Various in Kotlin
      - Numbers
        - Byte
        - Short

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buildscript {
    ext.kotlin_version = '1.2.31' // add version
    // ...
    dependencies {
        // ...
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" // Add kotlin dependency
    }
}
// ...

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// This will vary
package com.example.application;

// Core RNFirebase
import io.invertase.firebase.RNFirebasePackage;

public class MainApplication extends Application implements ReactApplication {

    @Override
    protected List<ReactPackage> getPackages() {

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dependencies {
  // Add to dependencies
  compile(project(':react-native-firebase')) {
    transitive = false
  }
  compile "com.google.firebase:firebase-core:11.4.2"

  // If you are receiving Google Play API availability issues, add the following dependency
  compile "com.google.android.gms:play-services-base:11.4.2"
}