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Supabase Client API .cursorrules prompt files

The Supabase Client API enables seamless interaction with Supabase backend services, simplifying the development of applications with real-time databases and authentication.

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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