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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.