Setup Firebase Functions (Dart & JS) - Flutter Write your Firebase Functions with Dart in Flutter. You also have the possibility to use JavaScript & Dart in your Firbease Functions. ⚡ Social Media Twitter: @JohannesMilke Linkedin: @JohannesMilke Medium: @JohannesMilke ✌ Preview App Preview Course Preview ➜ Buy My Courses 📺 Watch Video YouTube video where the source code is explained. Subscribe YouTube channel.