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Optimize JavaScript Next.js Tailwind CSS .cursorrules prompt file

Code Style and Structure
Write concise, technical JavaScript code with accurate examples.
Use functional and declarative programming patterns; avoid using classes unless absolutely necessary.
Prefer iteration and modularization over code duplication.
Use descriptive variable names with auxiliary verbs (e.g., isLoading, hasError, canSubmit).
Structure files in a way that separates concerns: exported component, subcomponents, helpers, static content, types.
Naming Conventions
Use lowercase with dashes for directories (e.g., components/auth-wizard).
Use camelCase for function and variable names (e.g., fetchUserData, handleInputChange).
Favor named exports for components, ensuring consistency across the codebase.
JavaScript Usage
Use JavaScript ES6+ features throughout the project (e.g., destructuring, arrow functions, template literals).
Avoid using var; use const and let for variable declarations.
Use functional components in React, leveraging hooks (useState, useEffect, useCallback, etc.) for managing state and side effects.
Use async/await syntax for asynchronous operations. Avoid the then/catch pattern for cleaner asynchronous logic.
Syntax and Formatting
Use arrow functions for concise function declarations, especially for event handlers and inline functions.
Avoid unnecessary curly braces in conditionals; use ternary operators or short-circuit evaluation (condition && expression).
Use JSX declaratively for rendering UI components, keeping it clean and readable.
Follow ESLint rules and use a formatter like Prettier for consistent code style.
UI and Styling
Use Shadcn UI, Radix UI, and Tailwind CSS for building components and styling the application.
Implement responsive design using Tailwind's mobile-first utility classes. Ensure the design is optimized for mobile devices and scales properly on larger screens.
Avoid inline styles and prefer Tailwind utility classes for styling wherever possible.
Performance Optimization
Minimize usage of useEffect, setState, and complex state management in React components. Whenever possible, use React Server Components (RSC) for performance gains.
Wrap client-side components in React.Suspense with a fallback to avoid unnecessary delays in loading.
Use dynamic imports for loading non-critical components lazily to optimize initial page load time.
Optimize images by using the WebP format where possible. Include image size data for better layout stability and use lazy loading for offscreen images.
Key Conventions
Use 'nuqs' for managing URL search parameters in the app to keep the state in sync with the URL.
Focus on optimizing Web Vitals: Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and First Input Delay (FID).
Limit usage of 'use client' to only essential areas that require client-side interactions, such as accessing browser APIs. Favor server-side rendering and static generation for data fetching and complex state management.
Next.js Data Fetching, Rendering, and Routing
Follow Next.js App Router conventions for data fetching:

Use getServerSideProps or getStaticProps where applicable for server-side and static generation, respectively.
Avoid client-side data fetching for content that can be pre-rendered.
Organize routes using the App Router with dynamic routing and nested layouts for a cleaner, modular structure.
Use Next.js Image optimization for handling images efficiently.

Leverage Next.js built-in support for incremental static regeneration (ISR) to ensure that the content stays up-to-date without affecting performance.

Additional Recommendations
Git Workflow: Use feature branches, pull requests, and code reviews. Keep the main branch production-ready.

Testing: Write unit tests using Jest for server logic and React Testing Library for client-side testing. Aim for test coverage across critical paths in both frontend and backend.

Version Control: Ensure clear, descriptive commit messages following the Conventional Commits format (e.g., feat: add login component or fix: update socket connection handling).

This revised template should provide your AI developer with a solid foundation for your project, adhering to best practices and consistent code structure across the JavaScript and React stack.

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