🚀 FireLang - Firebase Lang Config

FireLang is an open-source Dart/Flutter package that automates multi-language translations for Firebase Remote Config.

🔹 It reads translation files from your project's config/ directory and generates:

• ✅ RemoteConfig JSON (remoteconfig.template.json) for Firebase.
• ✅ Dart Localization Class (lib/lang.dart) for Flutter apps.

📌 Features

• 🔹 Automates Firebase Remote Config multi-language setup.
• 🔹 Ensures translation consistency across all locales.
• 🔹 Supports any number of languages (JSON-based translations).
• 🔹 Generates a Dart localization class (Lang) for use in Flutter.
• 🔹 Validates missing or extra keys to prevent translation mismatches.
• 🔹 Supports deployment as a dev dependency for easy use.

🚀 Installation

1️⃣ Install from pub.dev

Once the package is published, you can add it to your pubspec.yaml:

dev_dependencies:
  firelang: ^1.0.2

Then run:

dart pub get

2️⃣ Setup Translation Files (Inside Your Project)

Inside your Flutter/Dart project root, create a config/ directory:

my_flutter_project/
│── config/
│   ├── dp/
│   │   ├── default.json  <-- Default translations (required)
│   │   ├── en.json  <-- English translations (required)
│   │   ├── es.json  <-- Spanish translations (optional)
│   │   ├── fr.json  <-- French translations (optional)
│── lib/
│   ├── main.dart
│   ├── lang.dart  <-- 🔥 Auto-generated localization class
│── pubspec.yaml

3️⃣ Translation JSON Structure

Each JSON file inside config/ should have the same keys across all languages.

✅ Example: config/dp/en.json

{
  "welcome": "Welcome",
  "logout": "Log Out",
  "error": "Something went wrong"
}

✅ Example: config/dp/es.json

{
  "welcome": "Bienvenido",
  "logout": "Cerrar sesión",
  "error": "Algo salió mal"
}

🚨 Every translation file must have the same keys.
If any language is missing a key, the script will throw an error.

⚡️ Usage

1️⃣ Build & Deploy

Run this command inside your Flutter project root:

dart run firelang

What This Command Does

• ✅ Reads translations from your config/ folder.
• ✅ Generates remoteconfig.template.json in your project root.
• ✅ Deploys Firebase Remote Config using firebase deploy.
• ✅ Creates lib/lang.dart in your project's lib/ folder.

📌 How to Use lang.dart in Flutter

Your Dart localization class (Lang) will be auto-generated inside your lib/lang.dart.

1️⃣ Add Lang.delegate to MaterialApp

Inside your main.dart, add Lang.delegate:

import 'package:flutter/material.dart';
import 'package:firelang/lang.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Lang().init(); // Initialize translations
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      localizationsDelegates: [
        Lang.delegate, 
      ],
      home: HomeScreen(),
    );
  }
}

2️⃣ Access Translations in Your App

Lang.of(context).welcome   // Gets "Welcome" in English or "Bienvenido" in Spanish
Lang.of(context).logout    // Gets "Log Out" or "Cerrar sesión"

3️⃣ Manually Set Language

If you want to force a specific language, call:

Lang.setLanguage('es');  // Switch to Spanish
Lang.setLanguage('en');  // Switch back to English
Lang.setLanguage('');    // Reset to device default

🔧 Firebase Deployment

After building your config, deploy it manually using:

firebase deploy --only remoteconfig

🚀 This will update Firebase Remote Config with your latest translations.

❓ FAQ

Where does lang.dart go?

✅ It is generated in your project's lib/ directory.

Where does remoteconfig.template.json go?

✅ It is generated in your project's root directory.

What if a translation file is missing a key?

🚨 The script will throw an error and show which keys are missing.

Can I add more languages later?

Yes! Just add new .json files inside config/dp/, then run the build command again:

dart run firelang

👨‍💻 Contributing

We welcome contributions! Feel free to:

1. Fork the repo.
2. Create a feature branch.
3. Submit a pull request.

📜 License

This project is licensed under the MIT License.

🚀 Final Thoughts

🎯 FireLang simplifies multi-language support for Firebase Remote Config and Flutter.
🔥 One command to sync translations across Dart, Flutter, and Firebase.

✨ Star this repo if you found it useful! 🚀
📌 GitHub Repo: https://github.com/alltruevalue/firelang