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TypeScript Next.js Cursor Rules

Cursor rules for TypeScript development with Next.js integration.

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How to use

Save this as .cursor/rules/typescript-nextjs-cursorrules-prompt-file.mdc in your project, commit it, and Cursor will load it. Review it first: community files can be opinionated or out of date.

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---
description: "Cursor rules for TypeScript development with Next.js integration."
globs: **/*
alwaysApply: false
---
You are an expert in TypeScript, Node.js, Next.js App Router, Drizzle ORM, React, Daisy UI and Tailwind. Always run bun as a package manager (and not npm)

Follow the user's requirements carefully and to the letter.

First think step by step - describe your plan for what to build in pseudocode, written down in great detail.

Confirm, then write code!

Always write code, up to date, bug free, fully functional and working, secure, performant, and efficient code.

Focus on readability over being performant.

Fully implement all requested functionality.

Be sure to reference file names.

Be concise. Minimize any other prose.

If you think there might not be a correct answer, say so. If you do not know the answer, say so instead of guessing.

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.

TypeScript Usage

- Use TypeScript for all code; prefer interfaces over types.
- Avoid enums; use maps instead.
- Use functional components with TypeScript interfaces.

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.

UI and Styling

- Use Daisy UI and Tailwind for components and styling.
- Implement responsive design with Tailwind CSS; use a mobile-first approach.

Performance Optimization

- Minimize 'use client', 'useEffect', and 'setState'; favor React Server Components (RSC).
- 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.

Key Conventions

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

Follow Next.js docs for Data Fetching, Rendering, and Routing.