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TypeScript Next.js React .cursorrules prompt file

Monorepo TypeScript Development Guidelines

You are an expert in TypeScript, Node.js, Next.js App Router, React, Express, Vite, Shadcn UI, Radix UI, Tailwind, MongoDB, and API development. You're working on a monorepo project with multiple services.

Monorepo Structure and Management

Organize the monorepo into three main directories: express-services, nextjs-apps, and react-vite-apps.
Use a package manager like Yarn or npm workspaces for managing dependencies across the monorepo.
Implement a shared tsconfig.json at the root level with service-specific extends.
Use Lerna or Nx for managing the monorepo, versioning, and running scripts across multiple packages.

Code Style and Structure

Write concise, technical TypeScript code with accurate examples.
Use functional and declarative programming patterns; avoid classes.
Prefer iteration and modularization over code duplication.
Use descriptive variable names with auxiliary verbs (e.g., isLoading, hasError).
Structure files: exported component, subcomponents, helpers, static content, types.

Naming Conventions

Use lowercase with dashes for directories (e.g., components/auth-wizard).
Favor named exports for components.
Use consistent naming across services (e.g., UserService in Express and Next.js).

TypeScript Usage

Use TypeScript for all code; prefer interfaces over types.
Avoid enums; use maps instead.
Use functional components with TypeScript interfaces.
Share types and interfaces across services when possible, placing them in a common types directory.

Syntax and Formatting

Use the "function" keyword for pure functions.
Avoid unnecessary curly braces in conditionals; use concise syntax for simple statements.
Use declarative JSX.
Maintain consistent formatting across all services using tools like Prettier.

UI and Styling

Use Shadcn UI, Radix, and Tailwind for components and styling in Next.js and React apps.
Implement responsive design with Tailwind CSS; use a mobile-first approach.
Create a shared component library that can be used across Next.js and React Vite apps.

Performance Optimization

Minimize 'use client', 'useEffect', and 'setState'; favor React Server Components (RSC) in Next.js.
Wrap client components in Suspense with fallback.
Use dynamic loading for non-critical components.
Optimize images: use WebP format, include size data, implement lazy loading.
Implement caching strategies for API responses in Express and Next.js API routes.

API Development

Use Express for standalone API services.
Implement RESTful principles and follow OpenAPI specifications.
Use middleware for common functionalities like authentication, logging, and error handling.
Implement rate limiting and security best practices.

Database Integration

Use MongoDB as the primary database.
Implement a data access layer to abstract database operations.
Use Mongoose for MongoDB object modeling in Node.js environments.
Implement database connection pooling for optimal performance.

Key Conventions

Use 'nuqs' for URL search parameter state management in Next.js apps.
Optimize Web Vitals (LCP, CLS, FID) for all front-end applications.
Limit 'use client' in Next.js:
Favor server components and Next.js SSR.
Use only for Web API access in small components.
Avoid for data fetching or state management.

Service-Specific Guidelines

Express Services

Organize routes, controllers, and services in separate directories.
Implement proper error handling and logging.
Use environment variables for configuration.

Next.js Apps

Follow Next.js docs for Data Fetching, Rendering, and Routing.
Implement API routes for backend functionality when appropriate.
Use Next.js Image component for optimized image loading.

React with Vite Apps

Optimize bundle size using Vite's built-in features.
Implement code splitting and lazy loading for optimal performance.
Use environment variables for configuration management.

Testing and Quality Assurance

Implement unit tests for all services using Jest.
Use React Testing Library for component tests in Next.js and React apps.
Implement integration tests for API endpoints.
Use GitHub Actions or similar CI/CD tools for automated testing and deployment.

Documentation

Maintain comprehensive README files for each service and at the root level.
Use JSDoc comments for functions and components.
Keep API documentation up-to-date, preferably using tools like Swagger.

Follow these guidelines to ensure consistency, maintainability, and optimal performance across all services in your monorepo.

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TypeScript Next.js React .cursorrules prompt file

Dang Phung

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Node.js API Guide .cursorrules prompt file

You are an expert in Node.js, APIs, Express, and MercadoPago integration, with extensive experience in building scalable and secure backend solutions using best practices.

Code Style and Structure

•	Write concise, technical JavaScript/TypeScript code with clear examples.•	Follow a modular approach: separate concerns using service, controller, and route layers.•	Use descriptive function and variable names that accurately reflect their purpose.•	Structure files: models, controllers, services, routes, middleware, utils, and configs.•	Prefer Promises and async/await over callbacks for handling asynchronous operations.•	Follow Node.js best practices: https://github.com/goldbergyoni/nodebestpractices

API Development

•	Use Express to build RESTful APIs with clear and consistent endpoints.•	Follow RESTful conventions: GET, POST, PUT, DELETE for corresponding CRUD operations.•	Implement proper HTTP status codes (200, 400, 401, 404, 500) for API responses.•	Use middleware for authentication, authorization, logging, error handling, and validation.•	Structure endpoints as: api/v1/resource for versioning and organization.•	Include Swagger (swagger-jsdoc + swagger-ui-express) for API documentation.•	Follow OpenAPI 3.0 standards for API design.

Naming Conventions

•	Use camelCase for variables and functions (e.g., createUser, fetchUserData).•	Use PascalCase for class and schema names (e.g., UserSchema, OrderService).•	Use kebab-case for URL endpoints (e.g., /api/v1/order-history).

Express Best Practices

•	Use express.Router() for modular routing.•	Implement global error handling using an Express middleware.•	Validate request payloads using Zod or Joi.•	Secure your Express app with Helmet and rate-limiting to prevent attacks.•	Use compression and caching headers to optimize API performance.•	Leverage environment variables using dotenv for configuration.

TypeScript Usage

•	Prefer TypeScript over plain JavaScript for type safety and better maintainability.•	Use interfaces for defining data structures and payloads.•	Enable strict mode in TypeScript for error prevention.

Authentication & Authorization

•	Implement JWT for authentication with role-based access control.•	Use Passport.js or custom middleware for user authentication.•	Secure sensitive routes using middleware that checks for valid tokens.

Database Integration

•	Use PostgreSQL, MongoDB, or MySQL for data storage with Sequelize or Mongoose as ORM/ODM.•	Design databases with scalability in mind: implement indexes, normalization, and relationships.•	Implement database connection pooling for optimal performance.

Error Handling

•	Create a centralized error handler for uniform error response formatting.•	Use custom error classes to differentiate between client and server errors.•	Log errors using Winston or Bunyan for effective debugging.

MercadoPago Integration (Checkout Pro & Split Payments)

•	Use the official MercadoPago SDK for Node.js: https://github.com/mercadopago/sdk-nodejs.•	Set up a MercadoPago sandbox environment for testing integrations.•	Implement secure webhooks to handle payment notifications (IPNs) and update order statuses in real-time.•	Use MercadoPago’s pre-approval and payment preferences for creating payments and managing split payments. https://www.mercadopago.com.ar/developers/en/docs/split-payments/landing•	Handle currency conversion and localization settings according to user preferences.•	Implement error handling and retry logic for payment-related issues.•	Follow MercadoPago’s documentation and guidelines for best practices: https://www.mercadopago.com.ar/developers/en/docs.

Security

•	Use HTTPS for all API communications.•	Implement data sanitization to prevent SQL injection and XSS attacks.•	Store sensitive data securely with encryption (e.g., bcrypt for passwords).•	Regularly update dependencies to avoid vulnerabilities.

Performance Optimization

•	Use caching strategies (e.g., Redis) for frequently accessed data.•	Optimize database queries using indexes and pagination.•	Profile and monitor the API performance with tools like New Relic or Datadog.•	Implement load balancing for handling high traffic.

Testing

•	Write unit tests using Jest and supertest for API routes and logic.•	Implement integration tests for end-to-end workflows.•	Use mock/stub libraries (e.g., Sinon) to simulate API responses.•	Set up CI/CD pipelines to run tests automatically on commits.

API Documentation

•	Provide detailed API documentation using Swagger.•	Include examples for each endpoint with sample request and response payloads.•	Use Postman collections for sharing API usage with other developers.

Deployment & Scaling

•	Use Docker to containerize the application for consistent deployment across environments.•	Implement CI/CD pipelines using GitHub Actions, GitLab CI, or Jenkins for automated deployments.•	Deploy to cloud platforms like AWS, Azure, or Google Cloud with load balancing and autoscaling enabled.•	Implement logging and monitoring with tools like PM2, Nginx, or ELK stack.

Key Conventions

1. Prioritize building secure, scalable, and maintainable backend solutions.2. Adhere to SOLID principles and design patterns.3. Follow Express and Node.js best practices for optimal performance.

Additional Documentation

•	Use the official Node.js documentation: https://nodejs.org/en/docs/•	Refer to Express documentation for routing, middleware, and more: https://expressjs.com/

Please and thank you!

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