Constitution: Principles for Let's Chat Project
This document outlines the core principles that guide the development of the Let's Chat application. These principles ensure high-quality code, robust testing, consistent user experience, and optimal performance. The governance section describes how these principles influence technical decisions and project management.
1. Code Quality Principles
Type Safety and Maintainability
- TypeScript First: All new code must be written in TypeScript to ensure type safety and reduce runtime errors. Existing JavaScript code should be gradually migrated.
- Clean Code Standards: Follow clean code principles with descriptive variable names, small functions, and clear separation of concerns.
- ESLint Compliance: All code must pass ESLint checks defined in
eslint.config.mjs. No warnings should be ignored without justification. - Modular Architecture: Use modular design with clear boundaries between components, services, and utilities.
Documentation and Comments
- Inline Documentation: Complex logic must be documented with clear comments explaining the "why" and "how".
- API Documentation: All public APIs and functions must have JSDoc comments.
- README Updates: Update relevant documentation when adding new features or changing existing functionality.
2. Testing Standards
Test Coverage Requirements
- Unit Tests: Every component, hook, utility function, and service must have corresponding unit tests.
- Integration Tests: API endpoints and critical user flows must have integration tests.
- End-to-End Tests: Key user journeys should be covered by E2E tests using appropriate tools.
- Coverage Threshold: Maintain minimum 80% code coverage across all test types.
Testing Framework and Practices
- Vitest Usage: Use Vitest as the primary testing framework, configured in
vitest.config.ts. - Test-Driven Development: Prefer TDD for new features where applicable.
- Mocking Strategy: Use appropriate mocking for external dependencies (Supabase, APIs) to ensure isolated testing.
- Performance Testing: Include performance benchmarks in tests for critical paths.
3. UX Consistency Principles
Design System
- Component Library: Use shared UI components from
src/components/ui/for consistency. - Tailwind CSS Standards: Follow Tailwind CSS conventions for styling, defined in
tailwind.config.js. - Responsive Design: Ensure all interfaces work seamlessly across desktop, tablet, and mobile devices.
User Experience Guidelines
- Consistent Navigation: Maintain uniform navigation patterns across all pages and components.
- Accessibility: Follow WCAG guidelines for accessibility, including proper ARIA labels and keyboard navigation.
- Error Handling: Provide clear, user-friendly error messages and recovery options.
- Loading States: Implement consistent loading indicators and skeleton screens.
4. Performance Requirements
Frontend Performance
- Bundle Optimization: Keep bundle sizes under 500KB for initial load, using Next.js optimizations.
- Lazy Loading: Implement code splitting and lazy loading for non-critical components.
- Image Optimization: Use Next.js Image component for automatic optimization and WebP format support.
Backend and Database Performance
- Query Optimization: Ensure database queries are efficient with proper indexing.
- Caching Strategy: Implement appropriate caching layers (browser, CDN, server-side) for frequently accessed data.
- API Response Times: Target sub-200ms response times for API endpoints.
Monitoring and Metrics
- Performance Monitoring: Use tools to monitor Core Web Vitals and other performance metrics.
- Load Testing: Conduct regular load testing to ensure scalability.
Governance: Guiding Technical Decisions
Decision-Making Framework
- Principle-Based Decisions: All technical decisions must align with these principles. When principles conflict, prioritize based on project goals and user impact.
- Architecture Reviews: Major architectural changes require review by the core team to ensure alignment with principles.
- Trade-off Analysis: Document trade-offs when principles cannot be fully satisfied, with clear rationale.
Development Process
- Code Reviews: All pull requests must pass code review focusing on these principles.
- CI/CD Pipeline: Automated checks for linting, testing, and performance must pass before deployment.
- Regular Audits: Conduct quarterly code quality and performance audits.
Team Responsibilities
- Developer Accountability: Each developer is responsible for ensuring their code meets these standards.
- Mentorship: Senior developers mentor juniors on these principles.
- Continuous Improvement: Regularly review and update these principles based on project evolution and industry best practices.
Enforcement and Exceptions
- Zero Tolerance for Core Violations: Critical violations (e.g., security issues, major performance regressions) require immediate remediation.
- Exception Process: Exceptions to principles require written approval from the technical lead, with documented rationale.
- Metrics Tracking: Track adherence to principles through automated dashboards and regular reporting.
This constitution serves as the foundation for maintaining high-quality, user-focused development in the Let's Chat project. All team members should familiarize themselves with these principles and apply them consistently in their work.