app.config.js

import 'dotenv/config';

module.exports = ({ config }) => {
  return {
    ...config,
    ios: {
      ...config.ios,
      googleServicesFile: process.env.GOOGLE_SERVICE_INFO
    },
    android: {
      ...config.android,
      googleServicesFile: process.env.GOOGLE_SERVICE_JSON
    },
    extra: {
      ...config.extra,
      firebase: {
        apiKey: process.env.FIREBASE_API_KEY,
        authDomain: process.env.FIREBASE_AUTH_DOMAIN,
        projectId: process.env.FIREBASE_PROJECT_ID,
        storageBucket: process.env.FIREBASE_STORAGE_BUCKET,
        messagingSenderId: process.env.FIREBASE_MESSAGING_SENDER_ID,
        appId: process.env.FIREBASE_APP_ID,
        measurementId: process.env.FIREBASE_MEASUREMENT_ID,
      },
      googleAuthClientId: process.env.GOOGLE_AUTH_CLIENT_ID
    }
  };
};