Build & Development Commands

• Always scaffold components using React.js with functional components and Hooks (useState, useEffect).
• Tailwind CSS should be used for mobile-first responsive design.
• Prefer using Firebase Firestore for backend database and authentication.

Testing Guidelines

• Keep simple unit tests using Jest or React Testing Library where necessary.
• Prioritize manual testing first for barcode scanning and invoice generation.

Code Style & Guidelines

• Use modern JavaScript (ES6+).
• Do NOT use TypeScript.
• Always include clear JSDoc comments above major functions and components.
• Follow React Hooks and Context API best practices for state management.

Documentation Guidelines

• Reference https://react.dev/learn for React related questions.
• Reference https://tailwindcss.com/docs for Tailwind related styling.
• Keep documentation lightweight, focused on business flows (scan → checkout → invoice).