.cursorrules Cursor AI TypeScript Next.js Supabase Guide

Cursor AI TypeScript .cursorrules prompt file

Kerem Karatal

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Cursor AI TypeScript .cursorrules prompt file

You are an expert in TypeScript, Node.js, Next.js 14 App Router, React, Shadcn UI, Radix UI, Tailwind, Tailwind Aria, Supabase/Postgres with Supabase Client API.

Key Principles

Write concise, technical responses with accurate TypeScript examples.
Use functional, declarative programming. Avoid classes.
Prefer iteration and modularization over duplication.
Use descriptive variable names with auxiliary verbs (e.g., isLoading).
Use lowercase with dashes for directories (e.g., components/auth-wizard).
Favor named exports for components.
Use the Receive an Object, Return an Object (RORO) pattern.

TypeScript Usage

Use "function" keyword for pure functions. Omit semicolons.
Use TypeScript for all code. Prefer interfaces over types. Avoid enums, use maps.
File structure: Exported component, subcomponents, helpers, static content, types.
Avoid unnecessary curly braces in conditional statements.
For single-line statements in conditionals, omit curly braces.
Use concise, one-line syntax for simple conditional statements (e.g., if (condition) doSomething()).

Error Handling and Validation

Prioritize error handling and edge cases:
Handle errors and edge cases at the beginning of functions.
Use early returns for error conditions to avoid deeply nested if statements.
Place the happy path last in the function for improved readability.
Avoid unnecessary else statements; use if-return pattern instead.
Use guard clauses to handle preconditions and invalid states early.
Implement proper error logging and user-friendly error messages.
Consider using custom error types or error factories for consistent error handling.

React/Next.js

Use functional components and TypeScript interfaces.
Use declarative TSX.
Use function, not const, for components.
Use Shadcn UI, Radix, and Tailwind Aria for components and styling.
Implement responsive design with Tailwind CSS.
Use mobile-first approach for responsive design.
Place static content and interfaces at file end.
Use content variables for static content outside render functions.
Minimize 'use client', 'useEffect', and 'setState'. Favor RSC - server components.
Use Zod for form validation.
Wrap client components in Suspense with fallback.
Use dynamic loading for non-critical components.
Optimize images: WebP format, size data, lazy loading.
Model expected errors as return values: Avoid using try/catch for expected errors in Server Actions. Use useActionState to manage these errors and return them to the client.
Use error boundaries for unexpected errors: Implement error boundaries using error.tsx and global-error.tsx files to handle unexpected errors and provide a fallback UI.
Use useActionState with react-hook-form for form validation.
Code in services/ dir always throw user-friendly errors that tanStackQuery can catch and show to the user.
Use next-safe-action for all server actions:
Implement type-safe server actions with proper validation.
Utilize the action function from next-safe-action for creating actions.
Define input schemas using Zod for robust type checking and validation.
Handle errors gracefully and return appropriate responses.
Use import type { ActionResponse } from '@/types/actions'
Ensure all server actions return the ActionResponse type
Implement consistent error handling and success responses using ActionResponse

Components

When you need a component, do this:
think carefully about the component
generate a prompt
then with the prompt create a clickable link: component name
make sure prompt is url encoded

Data Access & Authentication/Authorisation

Use Supabase as the backend database. My setup is a production server and a local running development server.
Use Supabase Authentication and Authorization
Use Supabase Client API for database operations
Use Supabase local CLI for migrations

Key Conventions

Rely on Next.js App Router for state changes.
Prioritize Web Vitals (LCP, CLS, FID).
Minimize 'use client' usage:

Prefer server components and Next.js SSR features.
Use 'use client' only for Web API access in small components.
Avoid using 'use client' for data fetching or state management.

Refer to Next.js documentation for Data Fetching, Rendering, and Routing best practices.

Refer to Supabase documentation for authentication, database features

stack:

TypeScript

Node.js

Next.js 14 App Router

Cursor AI TypeScript .cursorrules prompt file

Kerem Karatal

About .cursorrules prompt file

What you can build

Supabase-Powered Chat App: Create a real-time chat application using Supabase for authentication and data storage, and Next.js with TypeScript for the front-end. Utilize Radix UI for accessible components and Tailwind CSS for responsive styling.
TypeScript Form Generator: A web tool that generates form components using TypeScript interfaces, Zod validation, and react-hook-form, styled with Shadcn UI and Tailwind CSS.
Next.js E-commerce Platform: Build a scalable and maintainable e-commerce platform with a focus on performance using Next.js 14 App Router, Supabase for backend operations, and optimize using Tailwind CSS for responsive design.
Dynamic Component Library: Develop a component library with Radix UI and Shadcn UI components, focused on accessibility and ease of use in TypeScript projects, offering clickable links with prompts for usage examples.
Serverless Blogging Platform: Create a blogging platform with Next.js that relies on server components and Supabase for content management, featuring TypeScript interfaces for post structures and user authentication.
Real-time Analytics Dashboard: An analytics dashboard that visualizes data from Supabase in real-time using React and Next.js, styled with Tailwind CSS, providing responsive data visualizations.
AI-driven Web App Builder: A tool that allows users to generate web applications by specifying requirements in prompts, leveraging Next.js and Supabase for the backend, and producing TypeScript-based code.
Remote Learning Management System: Develop an LMS using Next.js, Supabase for user and content management, and Radix UI for user interfaces, focusing on mobile-first design with Tailwind CSS.
SEO Optimization Tool: A tool for optimizing website performance and SEO using Web Vitals, built with Next.js for server-side rendering and data fetching strategies.
Event Management Application: Create an event management application using Supabase for event data storage and authentication, with Next.js for rendering and React components for user interactions.

Benefits

Emphasize functional, declarative programming, avoiding classes, and utilizing the RORO pattern for TypeScript functions.
Ensure concise, modularized code, promoting named exports, lowercase directories, and error handling with early returns and guard clauses.
Leverage React/Next.js with functional components, TypeScript interfaces, and mobile-first design using Shadcn UI, Radix UI, and Tailwind CSS elements.

Synopsis

Developers familiar with TypeScript and the Next.js ecosystem can use this prompt to build a scalable, maintainable web application with Supabase for data management and error handling best practices.

Overview of .cursorrules prompt

The .cursorrules file provides guidelines for developing applications using TypeScript, Node.js, Next.js 14, and related technologies. It emphasizes writing concise and technical code with TypeScript examples, preferring functional and declarative programming, modularization, and descriptive naming conventions. It guides error handling, validation, and structuring code with a focus on readability and maintainability. The file also includes best practices for React/Next.js development, such as using functional components, responsive design, error boundaries, and type safety with Zod for form validation. Additionally, it covers data access and authentication using Supabase, along with key conventions for optimizing performance and utilizing Next.js features. Developers are encouraged to follow these rules for consistent and efficient code implementation.

Cursor AI TypeScript .cursorrules prompt file

Cursor AI TypeScript .cursorrules prompt file

Cursor AI TypeScript .cursorrules prompt file

About .cursorrules prompt file

What you can build

Benefits

Synopsis

Overview of .cursorrules prompt

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