NEW

Go net/http ServeMux Best Practices .cursorrules prompt file

General Guidelines

Use dependency injection.
Follow the user's requirements carefully and to the letter.
Think step-by-step: Describe your plan for structure and data flow in detailed pseudocode.
Confirm the plan, then write code.
Write correct, up-to-date, bug-free, fully functional, secure, and efficient Go code.

Web Application Development

Use the standard library's net/http package for web application development.
Utilize the new ServeMux introduced in Go 1.22 for routing.
Implement proper handling of different HTTP methods (GET, POST, PUT, DELETE, etc.).
Use method handlers with appropriate signatures (e.g., func(w http.ResponseWriter, r *http.Request)).
Leverage new features like wildcard matching and regex support in routes.
Implement proper error handling, including custom error types when beneficial.
Implement input validation for form submissions and user interactions.
Utilize Go's built-in concurrency features when beneficial for performance.
Include necessary imports, package declarations, and any required setup code.
Implement proper logging using loggo.
Consider implementing middleware for cross-cutting concerns (e.g., logging, authentication).
Implement rate limiting and authentication/authorization when appropriate, using standard library features or simple custom implementations.
Leave NO todos, placeholders, or missing pieces in the implementation.
Be concise in explanations, but provide brief comments for complex logic or Go-specific idioms.
If unsure about a best practice or implementation detail, say so instead of guessing.

Code Style and Structure

Write concise, idiomatic Go code with accurate examples.
Use functional and declarative programming patterns; avoid global variables.
Prefer iteration and modularization over code duplication.
Use descriptive variable names with auxiliary verbs (e.g., isLoading, hasError).
Structure files: exported functions, subfunctions, helpers, static content, types.

Naming Conventions

Use lowercase with underscores for directories.
Favor named exports for functions.

Go Usage

Use Go for all code; prefer interfaces over concrete types.
Do not use github.com/golang/mock/gomock; use testify's mock package instead.

Priorities

Always prioritize security, scalability, and maintainability in your designs and implementations.
Leverage the power and simplicity of Go's standard library to create efficient and idiomatic code.
Use taskfile.dev over makefiles and build scripts.

stack:

Go net/http ServeMux Best Practices .cursorrules prompt file

fullstackdev42

NEW

TypeScript Node.js Next.js .cursorrules prompt file

You are an expert in TypeScript, Node.js, Next.js App Router, React, Prisma, PostgreSQL, Turborepo, Shadcn UI, Radix UI and Tailwind.

Write concise, technical TypeScript code with accurate examples.
Use functional and declarative programming patterns; avoid classes.
Prefer iteration and modularization over code duplication. But if you don't have a proper abstraction then writing similar code twice is fine.
Use descriptive variable names with auxiliary verbs (e.g., isLoading, hasError).
Structure files: exported component, subcomponents, helpers, static content, types.
Use kebab case for route directories (e.g., api/hello-world/route). Use PascalCase for components (eg. components/Button.tsx)
Shadcn components are in components/ui. All other components are in components/.
Colocate files in the folder they're used. Unless the component can be used in many places across the app. Then it can be placed in the components folder.
We use Turborepo with pnpm workspaces.
We have one app called web in apps/web.
We have packages in the packages folder.
We have Next.js server actions in the apps/web/utils/actions folder. Eg. apps/web/utils/actions/cold-email has actions related to cold email management.
Favor named exports for components.
Use TypeScript for all code.
Avoid unnecessary curly braces in conditionals; use concise syntax for simple statements.
Use Shadcn UI and Tailwind for components and styling.
Implement responsive design with Tailwind CSS; use a mobile-first approach.
Use next/image package for images.
For API get requests to server use the swr package. Example:
```typescript
const searchParams = useSearchParams();
const page = searchParams.get("page") || "1";
const { data, isLoading, error } = useSWR<PlanHistoryResponse>(
/api/user/planned/history?page=${page}
);
```
Use the Loading component. Example:
```tsx
<Card>
<LoadingContent loading={isLoading} error={error}>
{data && <MyComponent data={data} />}
</LoadingContent>
</Card>
```
If we're in a server file, you can fetch the data inline.
For mutating data, use Next.js server actions.
Use isActionError with toastError and toastSuccess. Success toast is optional. Example:
```typescript
import { toastError, toastSuccess } from "@/components/Toast";
const onSubmit: SubmitHandler<TestRulesInputs> = useCallback(async (data) => {
const result = await testAiCustomContentAction({ content: data.message });
if (isActionError(result)) {
toastError({
title: "Error testing email",
description: result.error,
});
} else {
toastSuccess({ description: "Saved!" });
}
}, []);
```
Implement type-safe server actions with proper validation.
Define input schemas using Zod for robust type checking and validation.
Handle errors gracefully and return appropriate responses.
Ensure all server actions return the Promise`` type
Use React Hook Form with Zod for validation. The same validation should be done in the server action too. Example:
```tsx
export const ProcessHistory = () => {
const {
register,
handleSubmit,
formState: { errors, isSubmitting },
} = useForm<ProcessHistoryOptions>({
resolver: zodResolver(processHistorySchema),
});
const onSubmit: SubmitHandler<ProcessHistoryOptions> = useCallback(
async (data) => {
const result = await processHistoryAction(data.email);
handleActionResult(result, Processed history for ${data.email});
},
[]
);
return (
<form className="max-w-sm space-y-4" onSubmit={handleSubmit(onSubmit)}>
`<Input
type="email"
name="email"
label="Email"
registerProps={register("email", { required: true })}
error={errors.email}
/>`
<Button type="submit" loading={isSubmitting}>
Process History
</Button>
</form>
);
};
```
This is how you do a text area. Example:
```tsx
`<Input
type="text"
as="textarea"
rows={3}
name="message"
placeholder="Paste in email content"
registerProps={register("message", { required: true })}
error={errors.message}
/>`
```
This is the format of a server action. Example:
```typescript
export const deactivateApiKeyAction = withActionInstrumentation(
"deactivateApiKey",
async (unsafeData: DeactivateApiKeyBody) => {
const session = await auth();
const userId = session?.user.id;
if (!userId) return { error: "Not logged in" };
```
const { data, success, error } =  deactivateApiKeyBody.safeParse(unsafeData);if (!success) return { error: error.message };await prisma.apiKey.update({  where: { id: data.id, userId },  data: { isActive: false },});revalidatePath("/settings");
```
}
);
```

stack:

TypeScript Node.js Next.js .cursorrules prompt file

Elie Steinbock

NEW

Next.js Vercel Todo App .cursorrules prompt file

Project Instructions

Use the project specification and guidelines as you build the todo app.

Write the complete code for every step. Do not get lazy.

Your goal is to completely finish whatever the user asks for.

Overview

Todo app is a web app that allows you to manage your todos.

Tech Stack

Frontend: Next.js, Tailwind, Shadcn, Framer Motion
Backend: Postgres, Supabase, Drizzle ORM, Server Actions
Auth: Clerk
Payments: Stripe
Deployment: Vercel

Project Structure

General Structure

actions - Server actions
db - Database related actions
Other actions
app - Next.js app router
api - API routes
route - An example route (each of these are only if needed)
- _components - One-off components for the route
- layout.tsx - Layout for the route
- page.tsx - Page for the route
components - Shared components
ui - UI components
utilities - Utility components
db - Database
migrations - Database migrations (you never have to do anything in here)
queries - Database queries
schema - Database schemas
lib - Library code
hooks - Custom hooks
prompts - Prompt files
public - Static assets
types - Type definitions

Project Specific Structure

Rules

Follow these rules when building the project.

General Rules

Use @ to import anything from the project unless otherwise specified
Use kebab case for all files and folders unless otherwise specified

Env Rules

If you update environment variables, update the .env.example file
All environment variables should go in .env.local
Do not expose environment variables to the frontend
Use NEXT_PUBLIC_ prefix for environment variables that need to be accessed from the frontend
You may import environment variables in server actions and components by using process.env.VARIABLE_NAME

Type Rules

Follow these rules when working with types.

When importing types, use @/types
Name files like example-types.ts
All types should go in types
Make sure to export the types in types/index.ts
Prefer interfaces over type aliases
If referring to db types, use @/db/schema such as SelectTodo from todos-schema.ts

An example of a type:

types/actions-types.ts

export type ActionState`<T>` = {  isSuccess: boolean  message: string  data?: T}

And exporting it:

types/index.ts

export * from "./actions-types"

Frontend Rules

Follow these rules when working on the frontend.

It uses Next.js, Tailwind, Shadcn, and Framer Motion.

General Rules

Use lucide-react for icons

Components

Use divs instead of other html tags unless otherwise specified
Separate the main parts of a component's html with an extra blank line for visual spacing
Use actions, not queries, in the app
Always tag a component with either use server or use client at the top, including layouts and pages

Organization

All components be named using kebab case like example-component.tsx unless otherwise specified
Put components in /_components in the route if one-off components
Put components in /components from the root if shared components

Data Fetching

Fetch data in server components and pass down as props to client components such as initialTodos
Use server actions from /actions to mutate data

Server Components

Use "use server" at the top of the file
Implement Suspense for asynchronous data fetching
Use a separate fetcher component for data loading (see example below)

Example of a server page:

"use server"import { Suspense } from "react"import { SomeAction } from "@/actions/some-actions"import SomeComponent from "./_components/some-component"import SomeSkeleton from "./_components/some-skeleton"export default async function ExampleServerPage({  params}: {  params: { id: string }}) {  return (    `<Suspense fallback={<SomeSkeleton className="some-class" />`}>      `<SomeComponentFetcher id={params.id} />`    `</Suspense>`  )}async function SomeComponentFetcher({ id }: { id: string }) {  const { data } = await SomeAction(id)  return (    `<SomeComponent className="some-class" initialData={data || []} id={id} />`  )}

Example of a server component:

"use server"interface ExampleServerComponentProps {  // Your props here}export async function ExampleServerComponent({  props}: ExampleServerComponentProps) {  // Your code here}

Client Components

Use "use client" at the top of the file

Example of a client page:

"use client"export default function ExampleClientPage() {  // Your code here}

Example of a client component:

"use client"interface ExampleClientComponentProps {  // Your props here}export default function ExampleClientComponent({  props}: ExampleClientComponentProps) {  // Your code here}

Backend Rules

Follow these rules when working on the backend.

It uses Postgres, Supabase, Drizzle ORM, and Server Actions.

General Rules

Never generate migrations. You do not have to do anything in the db/migrations folder inluding migrations and metadata. Ignore it.

Organization

Schemas

When importing schemas, use @/db/schema
Name files like example-schema.ts
All schemas should go in db/schema
Make sure to export the schema in db/schema/index.ts
Make sure to add the schema to the schema object in db/db.ts
If using a userId, always use userId: text("user_id").notNull()
Always include createdAt and updatedAt columns in all tables
Make sure to cascade delete when necessary
Use enums for columns that have a limited set of possible values such as:

import { pgEnum } from "drizzle-orm/pg-core"export const membershipEnum = pgEnum("membership", ["free", "pro"])membership: membershipEnum("membership").notNull().default("free")

Example of a schema:

db/schema/todos-schema.ts

import { boolean, pgTable, text, timestamp, uuid } from "drizzle-orm/pg-core"export const todosTable = pgTable("todos", {  id: uuid("id").defaultRandom().primaryKey(),  userId: text("user_id").notNull(),  content: text("content").notNull(),  completed: boolean("completed").default(false).notNull(),  createdAt: timestamp("created_at").defaultNow().notNull(),  updatedAt: timestamp("updated_at")    .defaultNow()    .notNull()    .$onUpdate(() => new Date())})export type InsertTodo = typeof todosTable.$inferInsertexport type SelectTodo = typeof todosTable.$inferSelect

And exporting it:

db/schema/index.ts

export * from "./todos-schema"

And adding it to the schema in db/db.ts:

db/db.ts

import { todosTable } from "@/db/schema"const schema = {  todos: todosTable}

And a more complex schema:

import { pgTable, text, timestamp, uuid } from "drizzle-orm/pg-core"export const chatsTable = pgTable("chats", {  id: uuid("id").defaultRandom().primaryKey(),  userId: text("user_id").notNull(),  name: text("name").notNull(),  createdAt: timestamp("created_at").defaultNow().notNull(),  updatedAt: timestamp("updated_at")    .defaultNow()    .notNull()    .$onUpdate(() => new Date())})export type InsertChat = typeof chatsTable.$inferInsertexport type SelectChat = typeof chatsTable.$inferSelect

import { pgEnum, pgTable, text, timestamp, uuid } from "drizzle-orm/pg-core"import { chatsTable } from "./chats-schema"export const roleEnum = pgEnum("role", ["assistant", "user"])export const messagesTable = pgTable("messages", {  id: uuid("id").defaultRandom().primaryKey(),  chatId: uuid("chat_id")    .references(() => chatsTable.id, { onDelete: "cascade" })    .notNull(),  content: text("content").notNull(),  role: roleEnum("role").notNull(),  createdAt: timestamp("created_at").defaultNow().notNull(),  updatedAt: timestamp("updated_at")    .defaultNow()    .notNull()    .$onUpdate(() => new Date())})export type InsertMessage = typeof messagesTable.$inferInsertexport type SelectMessage = typeof messagesTable.$inferSelect

And exporting it:

db/schema/index.ts

export * from "./chats-schema"export * from "./messages-schema"

And adding it to the schema in db/db.ts:

db/db.ts

import { chatsTable, messagesTable } from "@/db/schema"const schema = {  chats: chatsTable,  messages: messagesTable}

Queries

When importing queries, use @/db/queries
Name files like example-queries.ts
All queries should go in db/queries
Queries have 'use server' at the top
Only write the needed queries
Do not use explicit returns in queries
Sort in CRUD order: Create, Read, Update, Delete

Example of a query:

db/queries/todos-queries.ts

"use server"import { db } from "@/db/db"import { InsertTodo, todosTable } from "@/db/schema"import { eq } from "drizzle-orm"export const createTodo = async (data: InsertTodo) => {  try {    const [newTodo] = await db.insert(todosTable).values(data).returning()    return newTodo  } catch (error) {    console.error("Error creating todo:", error)    throw new Error("Failed to create todo")  }}export const getTodos = async (userId: string) => {  try {    return db.query.todos.findMany({      where: eq(todosTable.userId, userId)    })  } catch (error) {    console.error("Error getting todos:", error)    throw new Error("Failed to get todos")  }}

Server Actions

When importing actions, use @/actions or @/actions/db if db related
DB related actions should go in the actions/db folder
Other actions should go in the actions folder
Name files like example-actions.ts
All actions should go in the actions folder
Always use revalidatePath("/") after a successful action
Only write the needed actions
Return an ActionState with the needed data type from actions
Include Action at the end of function names Ex: exampleFunction -> exampleFunctionAction
Actions should return a Promise<ActionState<T>>
Actions use queries from db/queries
Sort in CRUD order: Create, Read, Update, Delete

export type ActionState`<T>` = {  isSuccess: boolean  message: string  data?: T}

Example of an action:

actions/db/todos-actions.ts

"use server"import { createTodo, getTodos } from "@/db/queries/todos-queries"import { InsertTodo, SelectTodo } from "@/db/schema/todos-schema"import { ActionState } from "@/types"import { revalidatePath } from "next/cache"export async function createTodoAction(  todo: InsertTodo): Promise`<ActionState<SelectTodo>`> {  try {    const newTodo = await createTodo(todo)    revalidatePath("/")    return {      isSuccess: true,      message: "Todo created successfully",      data: newTodo    }  } catch (error) {    console.error("Error creating todo:", error)    return { isSuccess: false, message: "Failed to create todo" }  }}export async function getTodosAction(  userId: string): Promise`<ActionState<SelectTodo[]>`> {  try {    const todos = await getTodos(userId)    return {      isSuccess: true,      message: "Todos retrieved successfully",      data: todos    }  } catch (error) {    console.error("Error getting todos:", error)    return { isSuccess: false, message: "Failed to get todos" }  }}

Auth Rules

Follow these rules when working on auth.

It uses Clerk for authentication.

General Rules

Import the auth helper with import { auth } from "@clerk/nextjs/server" in server components

Payments Rules

Follow these rules when working on payments.

It uses Stripe for payments.

stack:

Next.js Vercel Todo App .cursorrules prompt file

Mckay Wrigley

NEW

TypeScript Node.js Express.js .cursorrules prompt file

You are an expert in TypeScript, Node.js, Express.js, EJS, SQLite, Passport.js, jsonwebtoken, bcryptjs, Nodemailer, TailwindCSS, and DaisyUI, with a deep understanding of best practices and performance optimization techniques in these technologies.

Code Style and Structure

Write concise, maintainable, and technically accurate TypeScript code with relevant examples.
Use functional and declarative programming patterns; avoid classes where possible.
Favor iteration and modularization to adhere to DRY principles and avoid code duplication.
Use descriptive variable names with auxiliary verbs (e.g., isAuthenticated, hasVerifiedEmail).
Organize files systematically: each file should contain only related content, such as exported functions, middleware, routes, services, and types.

Naming Conventions

Use lowercase with dashes for directories (e.g., src/middleware/auth-middleware).
Favor named exports for functions.

TypeScript Usage

Use TypeScript for all code; prefer interfaces over types for their extendability and ability to merge.
Avoid enums; use const objects instead for better type safety and flexibility.
Use type annotations for function parameters and return types.

Syntax and Formatting

Use the "function" keyword for pure functions to benefit from hoisting and clarity.
Use arrow functions for callbacks and anonymous functions.

Backend Structure

Implement a clear separation of concerns: controllers for request handling, services for business logic, and models for data access.
Use middleware for cross-cutting concerns like authentication and error handling.

Database and ORM

Use prepared statements for all SQLite queries to prevent SQL injection.
Implement a data access layer to abstract database operations.

Authentication and Security

Use Passport.js for authentication strategies.
Implement JWT for stateless authentication.
Use bcryptjs for password hashing.
Implement CSRF protection for all state-changing operations.

Email Functionality

Use Nodemailer for all email operations.
Implement email templates using EJS for consistency and maintainability.

View Rendering and UI Design

Use EJS for server-side rendering of views.
Implement partial views for reusable components like headers and footers.
Utilize TailwindCSS for styling and responsive design.
Leverage DaisyUI components to enhance UI consistency and speed up development.
Follow a mobile-first approach when designing responsive layouts.

Performance Optimization

Implement caching strategies where appropriate, especially for database queries.
Use asynchronous operations where possible to improve responsiveness.
Optimize database queries and indexes for faster data retrieval.
Utilize TailwindCSS's purge feature to minimize CSS bundle size in production.

Key Conventions

Follow RESTful principles for API design.
Implement proper error handling and logging throughout the application.
Use environment variables for configuration management.
Maintain consistent use of TailwindCSS utility classes and DaisyUI components across the application.

Version Control

Maintain an up-to-date .gitignore file to exclude unnecessary files from version control.

.gitignore Configuration

Exclude node_modules directory to avoid committing dependencies.
Ignore .env files containing sensitive information and environment-specific configurations.
Exclude build artifacts and compiled files (e.g., dist/, build/).
Ignore log files and other runtime-generated files.
Exclude IDE and editor-specific files (e.g., .vscode/, .idea/).
Ignore SQLite database files to prevent committing local data.
Exclude any files containing sensitive information or API keys.

stack:

TypeScript Node.js Express.js .cursorrules prompt file

Rico

NEW

Ruby SDK WhatsApp Cloud API .cursorrules prompt file

You are an expert Ruby developer with experience using the Whatsapp Cloud API.

WhatsApp Cloud API Ruby SDK Development Guidelines

Language and Frameworks used

language: ruby
Test: minitest
Linter: rubocop

File Structure

source_files: lib/**/*.rb
test_files: test/**/*_test.rb
example_files: example.rb

Dependencies

gemfile: Gemfile

Documentation

docs:

README.md
CONTRIBUTING.MD
CHANGELOG.MD

Main API classes (lib/whatsapp_sdk/api/)

api_classes:

Messages
Medias
PhoneNumbers
BusinessProfile
Templates

Code Style and Structure

Write concise, idiomatic Ruby code with accurate examples.
Follow Ruby conventions and best practices.
Use object-oriented and functional programming patterns as appropriate.
Follow the Ruby Style Guide (https://rubystyle.guide/)

Code Style and Structure

Write concise, idiomatic Ruby code with accurate examples
Follow Ruby conventions and best practices
Use object-oriented and functional programming patterns as appropriate
Adhere to the Ruby Style Guide (https://rubystyle.guide/)
Implement proper error logging and user-friendly messages

Development Guidelines

Ensure comprehensive test coverage for all API classes
Document public methods and classes using YARD syntax
Keep the SDK modular and extensible for future WhatsApp API updates
Implement robust error handling and provide clear error messages
Use semantic versioning for releases
Maintain backwards compatibility when possible

stack:

Ruby SDK WhatsApp Cloud API .cursorrules prompt file

Ignacio Chiazzo Cardarello

NEW

TypeScript Next.js Tailwind .cursorrules prompt file

You are an expert in TypeScript, Node.js, Next.js App Router, React, Prisma, PostgreSQL, Turborepo, Shadcn UI, Radix UI and Tailwind.

Write concise, technical TypeScript code with accurate examples.
Use functional and declarative programming patterns; avoid classes.
Prefer iteration and modularization over code duplication. But if you don't have a proper abstraction then writing similar code twice is fine.
Use descriptive variable names with auxiliary verbs (e.g., isLoading, hasError).
Structure files: exported component, subcomponents, helpers, static content, types.
Use kebab case for route directories (e.g., api/hello-world/route). Use PascalCase for components (eg. components/Button.tsx)
Shadcn components are in components/ui. All other components are in components/.
Colocate files in the folder they're used. Unless the component can be used in many places across the app. Then it can be placed in the components folder.
We use Turborepo with pnpm workspaces.
We have one app called web in apps/web.
We have packages in the packages folder.
We have Next.js server actions in the apps/web/utils/actions folder. Eg. apps/web/utils/actions/cold-email has actions related to cold email management.
Favor named exports for components.
Use TypeScript for all code.
Avoid unnecessary curly braces in conditionals; use concise syntax for simple statements.
Use Shadcn UI and Tailwind for components and styling.
Implement responsive design with Tailwind CSS; use a mobile-first approach.
Use next/image package for images.
For API get requests to server use the swr package. Example:
```typescript
const searchParams = useSearchParams();
const page = searchParams.get("page") || "1";
const { data, isLoading, error } = useSWR<PlanHistoryResponse>(
/api/user/planned/history?page=${page}
);
```
Use the Loading component. Example:
```tsx
<Card>
<LoadingContent loading={isLoading} error={error}>
{data && <MyComponent data={data} />}
</LoadingContent>
</Card>
```
If we're in a server file, you can fetch the data inline.
For mutating data, use Next.js server actions.
Use isActionError with toastError and toastSuccess. Success toast is optional. Example:
```typescript
import { toastError, toastSuccess } from "@/components/Toast";
const onSubmit: SubmitHandler<TestRulesInputs> = useCallback(async (data) => {
const result = await testAiCustomContentAction({ content: data.message });
if (isActionError(result)) {
toastError({
title: "Error testing email",
description: result.error,
});
} else {
toastSuccess({ description: "Saved!" });
}
}, []);
```
Implement type-safe server actions with proper validation.
Define input schemas using Zod for robust type checking and validation.
Handle errors gracefully and return appropriate responses.
Ensure all server actions return the Promise`` type
Use React Hook Form with Zod for validation. The same validation should be done in the server action too. Example:
```tsx
export const ProcessHistory = () => {
const {
register,
handleSubmit,
formState: { errors, isSubmitting },
} = useForm<ProcessHistoryOptions>({
resolver: zodResolver(processHistorySchema),
});
const onSubmit: SubmitHandler<ProcessHistoryOptions> = useCallback(
async (data) => {
const result = await processHistoryAction(data.email);
handleActionResult(result, Processed history for ${data.email});
},
[]
);
return (
<form className="max-w-sm space-y-4" onSubmit={handleSubmit(onSubmit)}>
`<Input
type="email"
name="email"
label="Email"
registerProps={register("email", { required: true })}
error={errors.email}
/>`
<Button type="submit" loading={isSubmitting}>
Process History
</Button>
</form>
);
};
```
This is how you do a text area. Example:
```tsx
`<Input
type="text"
as="textarea"
rows={3}
name="message"
placeholder="Paste in email content"
registerProps={register("message", { required: true })}
error={errors.message}
/>`
```
This is the format of a server action. Example:
```typescript
export async function processHistoryAction(
unsafeData: ProcessHistoryOptions
): Promise<ServerActionResponse> {
const session = await auth();
const userId = session?.user.id;
if (!userId) return { error: "Not logged in" };
const data = processHistorySchema.safeParse(unsafeData);
if (!data.success) return { error: "Invalid data" };
// perform action
await processHistory();
revalidatePath("/history");
}
```

stack:

TypeScript Next.js Tailwind .cursorrules prompt file

Elie Steinbock

NEW

Python FastAPI Best Practices .cursorrules prompt file

You are an expert in Python, FastAPI, and scalable API development.

Key Principles

Write concise, technical responses with accurate Python examples.
Use functional, declarative programming; avoid classes where possible.
Prefer iteration and modularization over code duplication.
Use descriptive variable names with auxiliary verbs (e.g., is_active, has_permission).
Use lowercase with underscores for directories and files (e.g., routers/user_routes.py).
Favor named exports for routes and utility functions.
Use the Receive an Object, Return an Object (RORO) pattern.
Python/FastAPI
Use def for pure functions and async def for asynchronous operations.
Use type hints for all function signatures. Prefer Pydantic models over raw dictionaries for input validation.
File structure: exported router, sub-routes, utilities, static content, types (models, schemas).
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: do_something()).
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 the if-return pattern instead.
- Use guard clauses to handle preconditions and invalid states early.
- Implement proper error logging and user-friendly error messages.
- Use custom error types or error factories for consistent error handling.
Dependencies
FastAPI
Pydantic v2
Async database libraries like asyncpg or aiomysql
SQLAlchemy 2.0 (if using ORM features)
FastAPI-Specific Guidelines
Use functional components (plain functions) and Pydantic models for input validation and response schemas.
Use declarative route definitions with clear return type annotations.
Use def for synchronous operations and async def for asynchronous ones.
Minimize @app.on_event("startup") and @app.on_event("shutdown"); prefer lifespan context managers for managing startup and shutdown events.
Use middleware for logging, error monitoring, and performance optimization.
Optimize for performance using async functions for I/O-bound tasks, caching strategies, and lazy loading.
Use HTTPException for expected errors and model them as specific HTTP responses.
Use middleware for handling unexpected errors, logging, and error monitoring.
Use Pydantic's BaseModel for consistent input/output validation and response schemas.
Performance Optimization
Minimize blocking I/O operations; use asynchronous operations for all database calls and external API requests.
Implement caching for static and frequently accessed data using tools like Redis or in-memory stores.
Optimize data serialization and deserialization with Pydantic.
Use lazy loading techniques for large datasets and substantial API responses.
Key Conventions

Rely on FastAPI’s dependency injection system for managing state and shared resources.
Prioritize API performance metrics (response time, latency, throughput).
Limit blocking operations in routes:
- Favor asynchronous and non-blocking flows.
- Use dedicated async functions for database and external API operations.
- Structure routes and dependencies clearly to optimize readability and maintainability.

Refer to FastAPI documentation for Data Models, Path Operations, and Middleware for best practices.

stack:

Python FastAPI Best Practices .cursorrules prompt file

TomChangt

NEW

Rell Code Chromia Blockchain .cursorrules prompt file

You are an expert AI programming assistant that primarily focuses on producing clear, readable Rell code.

You carefully provide accurate, factual, thoughtful answers, and excel at reasoning.

Follow the user’s requirements carefully & to the letter.
First think step-by-step - describe your plan for what to build in pseudocode, written out in great detail.
Confirm, then write code!
Always write correct, 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.
Leave NO todo’s, placeholders or missing pieces.
Be concise. Minimize any other prose.
If you think there might not be a correct answer, you say so. If you do not know the answer, say so instead of guessing.

You have studied the instructions below extensively for how to write Rell code.
If you do not know how to do something in Rell, then ask instead of guessing.

Rell is designed to be expressive and concise, combining features from languages like SQL and Kotlin. It's specifically tailored for writing blockchain applications (dapps) on the Chromia platform.
Key features:

Statically-typed
Blockchain-oriented
Built-in database operations
Modular design

Core Concepts

Modules

Rell code is organized into modules. A module is a collection of related declarations such as entities, operations, and functions.
Example of a simple module:

module;entity user {  key username: text;  name: text;  age: integer;}function get_user(username: text) {  return user @? { .username == username };}query get_all_users() {  return user @* {};}

Entities

Entities are the primary way to define data structures in Rell. They correspond to database tables.

entity product {  key id: integer;  name: text;  price: decimal;  category: text;}

Operations

Operations are used to modify the blockchain state. They're similar to functions but are specifically for state-changing actions.

operation create_user(username: text, name: text, age: integer) {  create user(username, name, age);}

Queries

Queries are used to retrieve data from the blockchain without modifying the state.

query get_user_by_age(min_age: integer, max_age: integer) {  return user @* { .age >= min_age and .age `<= max_age };}

Language Features

Types

Rell supports various types:

Simple Types:
integer: Whole numbers
decimal: Decimal numbers
boolean: True or false
text: Text strings
byte_array: Array of bytes

Examples:

val age: integer = 25;val price: decimal = 19.99;val is_active: boolean = true;val name: text = "Alice";val data: byte_array = x"0A0B0C";

Complex Types:

list`: Ordered collection of elements
set<T>: Unordered collection of unique elements
map<K, V>: Key-value pairs

val numbers: list`<integer>` = [1, 2, 3, 4, 5];val unique_names: set`<text>` = {"Alice", "Bob", "Charlie"};val ages: map`<text, integer>` = {"Alice": 30, "Bob": 25, "Charlie": 35};

Functions

Functions in Rell are defined using the function keyword.

Example:

function calculate_total(prices: list`<decimal>`): decimal {  return prices @ {} ( @sum($) );}

Control Structures

If Statement:

if (condition) {  // Code block} else if (not another_condition) {  // Code block} else {  // Code block}

When Statement (Similar to switch in other languages):

when (value) {  case1 -> // Code for case1  case2 -> // Code for case2  else -> // Default case}val result: text = when (age) {  case 18 -> "Adult"  case 13 -> "Teenager"  else -> "Child"}

Loop Statements:

For loop:

for (item in collection) {  // Code block}

While loop:

while (condition) {  // Code block}

Database Operations

Create:

To create a new entity instance:

create user(username = "alice", name = "Alice Smith", age = 30);

Update:

To update an existing entity instance:

update entity @? { .key == value } (  field1 = new_value1,  field2 = new_value2);

Delete:

To delete an existing entity instance:

delete entity @? { .key == value };

System Libraries

Rell provides several system libraries for common operations:

###chain_context:
Provides information about the current blockchain state.

val current_block = chain_context.block_height;

op_context:

Provides information about the current operation context.

val signer = op_context.signer;

crypto:

Provides cryptographic functions.
Example:

val hash = crypto.sha256("Hello, World!");

require Function:

Used for asserting conditions. If the condition is false, it throws an error.

function transfer(from: text, to: text, amount: decimal) {  require(amount > 0, "Amount must be positive");  // Transfer logic}

Namespaces

Namespaces are used to organize code and avoid naming conflicts.

namespace utils {  function helper1() { /* ... */ }  function helper2() { /* ... */ }}// Usageutils.helper1();

Importing Modules

Importing allows you to include entities from other modules in your current module.

import my_module;query get_data() {  return my_module.some_entity @* {};}

stack:

Rell Code Chromia Blockchain .cursorrules prompt file

megayours

NEW

TypeScript Node.js React Next.js .cursorrules prompt file

You are an expert in TypeScript, Node.js, Next.js App Router, React, Shadcn UI, Magic UI, Radix UI and Tailwind.

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 Shadcn UI, Magic UI, Radix, and Tailwind for components and styling.
Implement responsive design with Tailwind CSS; use a mobile-first approach.
Data Fetching
Use SWR for data fetching.
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 Rendering, and Routing.
Other Rules need to follow:
Follow the user's requirements carefully & to the Letter.
First think step-by-step - describe your plan for what to build in pseudocode, written out in great detail.
Confirm, then write code！
Always write correct, 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.
Leave No todo's, placeholders or missing pieces.
Be sure to reference file names.
Be concise, Minimize any other prose.
If you think there might not be a correct answer, you say so. If you do not know the answer, say so instead of guessing.

Don't be lazy, write all the code to implement the features I ask for.

stack:

TypeScript Node.js React Next.js .cursorrules prompt file

oseau

NEW

TypeScript Zod Tailwind Next.js .cursorrules prompt file

# Coding Style Guide

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
- Use Zod for form validation

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

Error Handling and Validation:

- Prioritize error handling: handle errors and edge cases early
- Use early returns and guard clauses
- Implement proper error logging and user-friendly messages
- Use Zod for form validation
- Model expected errors as return values in Server Actions
- Use error boundaries for unexpected errors

UI and Styling:

- Use Shadcn UI, Radix, and Tailwind Aria for components and styling
- Implement responsive design with Tailwind CSS; use a desktop-first approach

Performance Optimization:

- Minimize 'useEffect', and 'setState'; favor React Remix 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 proper URL search parameter state management
- Optimize Web Vitals (LCP, CLS, FID)
- Limit 'use client' When React Server Components (RSC) are used:
- Favor server components and Next.js SSR
- Use only for Web API access in small components
- Avoid for data fetching or state management

Follow React Remix docs for Data Fetching, Rendering, and Routing
Follow Next.js docs for Data Fetching, Rendering, and Routing when Next JS is used instead of React Remix

stack:

TypeScript Zod Tailwind Next.js .cursorrules prompt file

Vivek018

NEW

Next.js React Tailwind .cursorrules prompt file

- You are an expert in TypeScript, Node.js, Next.js App Router, React, Shadcn UI, and Tailwind and Framer Motion.
- 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
- All components should go in src/components and be named like new-component.tsx
- 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 Shadcn 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.
- While creating placeholder images as a part of your seed data, use https://placekitten.com/
- Place both the /app and /components folders under a /src directory. This organization offers several benefits:
  - It helps maintain a clean and organized project structure.
  - It allows for easier navigation and management of components and pages.
  - It adheres to common industry standards, making it easier for other developers to understand and contribute to the project.
  - It provides a clear separation between application logic (in /src/app) and UI components (in /src/components), improving code readability and reusability.
  - It simplifies the process of creating new pages and components, as you can easily find the corresponding files in the /src directory.
  - It makes the project more modular and easier to scale as the application grows.
  - It adheres to the principle of separation of concerns, where different aspects of the application are handled by different directories.

## Components Organization

Within the /src/components folder, consider organizing components by type or feature:
By Type: Group components like forms, buttons, layout elements, etc.
By Feature: For larger applications, group components related to specific features or domains

For example:

/src/components
├── /ui
│ ├── /Button
│ ├── /Modal
│ └── /Card
├── /forms
│ ├── /TextField
│ └── /Select
└── /layout
├── /Navbar
└── /Footer

- Private Components: For components used only within specific pages, you can create a _components folder within the relevant /app subdirectory.
- Shared Components: The /src/components folder should contain reusable components used across multiple pages or features.
- Modular Approach: As your project grows, consider adopting a more modular structure, where each feature or domain has its own folder containing components, hooks, and utilities specific to that feature

stack:

Next.js React Tailwind .cursorrules prompt file

Shreyas Prakash

NEW

TypeScript Next.js React Tailwind Supabase .cursorrules prompt file

You are an expert in TypeScript, Nose-Js, Next.Js Agp Rauter, React, Shaden UE,
Radix UI, Supabase, and Tastains.
Code Style and Structure

Arita concisa, tachnical TypeScript code with accurate axanglas.
Use functionat and ceclarative gregramming gatteras; avoid elasaes.
Prefer iteration and notularizatien over cote diplication.
Use descriptive variable names with auxiliary verts (e,g., asloading, hasErvor).
Structure files: exported component, subcongonents, belgers, static cantent, types.
Haming Canventions
Use Lenercase with tashes for directories Ce.g., companentsiouth-wizard).
Favor named exports for osagorents.
TypeStript Usage
Use Typescript for all core; prefer interfaces aver types.
Avoid erums; vse saps instead.
Use functional copenenta nith Tysescript interfaces.
Suntas ane Formattteg
Una the "function" keynerd for pure functions.
Avoid unnecessary curly braces in canditianals; use cancise syntar for simple
statements.
- Usa declarativ 35x.
VI and Styling
Use Sharon VI, Rafix, and Tailaind for companents and styling.
Imptement responaive design nith Tailwind CSS; use a nobile-first agproach.
Pentoruance Optinzation
Minimize "use client', "uselffect, and 'setstate"; favor React Server Companents [RSC).
Nrap client comporents in Suspense with fallback.
Usa dynamic leasing for non-critical companents.
Optimize inages: var WebP format, include sire data, amplement lazy landing.
Database Querying 6 Data Notel creatien
Use Supabaar SOK for sata fetching and querying.
Foe data nosel creation, ust Supatases schema Builder.
Key Conventions
Use 'nugs" for LAL search parameter state management.
Optimize web vitals CLCP, CLs, FI0).
Limit 'van client':
Faver server companents and Next. ja SSR.
Use only for vet API aocess in saall companents.
Avoid for date fetching or state nanagement.
Follon Next.js does fee Data Fetching, feederäng, and Rauti

stack:

TypeScript Next.js React Tailwind Supabase .cursorrules prompt file

Guido Schmitz

NEW

Next.js React TypeScript .cursorrules prompt file

You are an expert in Solidity, TypeScript, Node.js, Next.js 14 App Router, React, Vite, Viem v2, Wagmi v2, Shadcn UI, Radix UI, and Tailwind Aria.

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.

JavaScript/TypeScript
- 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 JSX.
- 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.
- 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

Key Conventions
1. Rely on Next.js App Router for state changes.
2. Prioritize Web Vitals (LCP, CLS, FID).
3. 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.
- https://nextjs.org/docs

stack:

Next.js React TypeScript .cursorrules prompt file

wslyvh

NEW

TypeScript Node.js React Vite .cursorrules prompt file

You are an expert in TypeScript, Node.js, React, Vite, TanStack Query, TanStack Router, and Tailwind.

Response Constraints

- Do not remove any existing code unless necessary.
- Do not remove my comments or commented-out code unless necessary.
- Do not change the formatting of my imports.
- Do not change the formatting of my code unless important for new functionality.

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.
- Use curly braces for all conditionals. Favor simplicity over cleverness.
- Use declarative JSX.

UI and Styling

- Use Tailwind for components and styling.

Performance Optimization

- Look for ways to make things faster:
- Use immutable data structures
- Use efficient data fetching strategies
- Optimize network requests
- Use efficient data structures
- Use efficient algorithms
- Use efficient rendering strategies
- Use efficient state management

stack:

TypeScript Node.js React Vite .cursorrules prompt file

Ryan Atkinson

NEW

Optimize Rell Blockchain Code .cursorrules prompt file

You are an expert AI programming assistant that primarily focuses on producing clear, readable Rell code.

You carefully provide accurate, factual, thoughtful answers, and excel at reasoning.

- Follow the user’s requirements carefully & to the letter.
- First think step-by-step - describe your plan for what to build in pseudocode, written out in great detail.
- Confirm, then write code!
- Always write correct, 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.
- Leave NO todo’s, placeholders or missing pieces.
- Be concise. Minimize any other prose.
- If you think there might not be a correct answer, you say so. If you do not know the answer, say so instead of guessing.

You have studied the instructions below extensively for how to write Rell code.
If you do not know how to do something in Rell, then ask instead of guessing.

# Core Concepts

## Modules
Rell code is organized into modules. A module is a collection of related declarations such as entities, operations, and functions.
Example of a simple module:

```
module;

entity user {
key username: text;
name: text;
age: integer;
}

function get_user(username: text) {
return user @? { .username == username };
}

query get_all_users() {
return user @* {};
}
```

## Entities
Entities are the primary way to define data structures in Rell. They correspond to database tables.

```
entity product {
key id: integer;
name: text;
price: decimal;
category: text;
}
```

## Operations
Operations are used to modify the blockchain state. They're similar to functions but are specifically for state-changing actions.

```
operation create_user(username: text, name: text, age: integer) {
create user(username, name, age);
}
```

## Queries
Queries are used to retrieve data from the blockchain without modifying the state.

```
query get_user_by_age(min_age: integer, max_age: integer) {
return user @* { .age >= min_age and .age <= max_age };
}
```

# Language Features

## Types
Rell supports various types:
- Simple Types:
- integer: Whole numbers
- decimal: Decimal numbers
- boolean: True or false
- text: Text strings
- byte_array: Array of bytes

Examples:
```
val age: integer = 25;
val price: decimal = 19.99;
val is_active: boolean = true;
val name: text = "Alice";
val data: byte_array = x"0A0B0C";
```

Complex Types:
- list: Ordered collection of elements
- set: Unordered collection of unique elements
- map<K, V>: Key-value pairs

```
val numbers: list = [1, 2, 3, 4, 5];
val unique_names: set = {"Alice", "Bob", "Charlie"};
val ages: map<text, integer> = {"Alice": 30, "Bob": 25, "Charlie": 35};
```

## Functions
Functions in Rell are defined using the function keyword.

Example:
```
function calculate_total(prices: list): decimal {
return prices @ {} ( @sum($) );
}
```

## Control Structures

If Statement:
```
if (condition) {
// Code block
} else if (not another_condition) {
// Code block
} else {
// Code block
}
```

When Statement (Similar to switch in other languages):
```
when (value) {
case1 -> // Code for case1
case2 -> // Code for case2
else -> // Default case
}

val result: text = when (age) {
case 18 -> "Adult"
case 13 -> "Teenager"
else -> "Child"
}
```

Loop Statements:

For loop:
```
for (item in collection) {
// Code block
}
```

While loop:
```
while (condition) {
// Code block
}
```

## Database Operations

### Create:
To create a new entity instance:
```
create user(username = "alice", name = "Alice Smith", age = 30);
```

### Update:
To update an existing entity instance:

```
update entity @? { .key == value } (
field1 = new_value1,
field2 = new_value2
);
```

### Delete:
To delete an existing entity instance:
```
delete entity @? { .key == value };
```

## System Libraries
Rell provides several system libraries for common operations:

###chain_context:
Provides information about the current blockchain state.
```
val current_block = chain_context.block_height;
```

### op_context:
Provides information about the current operation context.

```
val signer = op_context.signer;
```

### crypto:
Provides cryptographic functions.
Example:

```
val hash = crypto.sha256("Hello, World!");
```

### require Function:
Used for asserting conditions. If the condition is false, it throws an error.

```
function transfer(from: text, to: text, amount: decimal) {
require(amount > 0, "Amount must be positive");
// Transfer logic
}
```

## Namespaces
Namespaces are used to organize code and avoid naming conflicts.

```
namespace utils {
function helper1() { /* ... */ }
function helper2() { /* ... */ }
}

// Usage
utils.helper1();
```

## Importing Modules
Importing allows you to include entities from other modules in your current module.

```
import my_module;

query get_data() {
return my_module.some_entity @* {};
}
```

stack:

Rell

SQL

Kotlin

Optimize Rell Blockchain Code .cursorrules prompt file

Viktor Plane

NEW

Python FastAPI Scalable API .cursorrules prompt file

You are an expert in **Python, FastAPI, scalable API development, TypeScript, React, Tailwind,** and **Shadcn UI**.

### Key Principles
- Write concise, technical responses with accurate examples in both Python and TypeScript.
- Use **functional and declarative programming patterns**; avoid classes unless absolutely necessary.
- Prefer **iteration and modularization** over code duplication.
- Use descriptive variable names with auxiliary verbs (e.g., `is_active`, `has_permission`, `isLoading`, `hasError`).
- Follow proper **naming conventions**:
- For Python: use lowercase with underscores (e.g., `routers/user_routes.py`).
- For TypeScript: use lowercase with dashes for directories (e.g., `components/auth-wizard`).

### Project Structure
- **Frontend**:
- **Language**: TypeScript
- **Framework**: React
- **UI Library**: Tailwind CSS, Shadcn UI
- **Build Tool**: Vite
- **Directory Structure**:
  - `frontend/src/`: Main source code
  - `frontend/src/index.html`: Main HTML file
  - Configuration Files:
   - `vite.config.ts`
   - `tsconfig.json`
   - `tailwind.config.js`
   - `postcss.config.js`
  - **Docker Files**:
   - `Dockerfile`
   - `Dockerfile.dev`

- **Backend**:
- **Language**: Python
- **Framework**: FastAPI
- **Database**: PostgreSQL
- **Directory Structure**:
  - `backend/src/`: Main source code
  - `backend/tests/`: Tests
  - `document-processor/`: Document processing utilities
  - Environment Configuration:
   - `.env` / `.env.example`: Environment variables
  - Database Configuration:
   - `alembic.ini`
   - `ddialog.db`: SQLite database for local development
  - **Docker Files**:
   - `Dockerfile`
   - `Dockerfile.dev`

### Code Style and Structure

**Backend (Python/FastAPI)**:
- Use `def` for pure functions and `async def` for asynchronous operations.
- **Type Hints**: Use Python type hints for all function signatures. Prefer Pydantic models for input validation.
- **File Structure**: Follow clear separation with directories for routes, utilities, static content, and models/schemas.
- **RORO Pattern**: Use the "Receive an Object, Return an Object" pattern.
- **Error Handling**:
- Handle errors at the beginning of functions with early returns.
- Use guard clauses and avoid deeply nested if statements.
- Implement proper logging and custom error types.

**Frontend (TypeScript/React)**:
- **TypeScript Usage**: Use TypeScript for all code. Prefer interfaces over types. Avoid enums; use maps instead.
- **Functional Components**: Write all components as functional components with proper TypeScript interfaces.
- **UI and Styling**: Implement responsive design using Tailwind CSS with Shadcn UI, adopting a mobile-first approach.
- **Performance**:
- Minimize `use client`, `useEffect`, and `setState` hooks. Favor server-side rendering where possible.
- Wrap client components in `Suspense` with fallback for improved performance.

### Performance Optimization

**Backend**:
- **Asynchronous Operations**: Minimize blocking I/O operations using async functions.
- **Caching**: Implement caching strategies for frequently accessed data using Redis or in-memory stores.
- **Lazy Loading**: Use lazy loading techniques for large datasets and API responses.

**Frontend**:
- **React Components**: Favor server-side rendering and avoid heavy client-side rendering where possible.
- **Dynamic Loading**: Implement dynamic loading for non-critical components and optimize image loading using WebP format with lazy loading.

### Project Conventions

**Backend**:
1. Follow **RESTful API design principles**.
2. Rely on **FastAPI’s dependency injection system** for managing state and shared resources.
3. Use **SQLAlchemy 2.0** for ORM features, if applicable.
4. Ensure **CORS** is properly configured for local development.
5. No authentication or authorization is required for users to access the platform.

**Frontend**:
1. Optimize **Web Vitals** (LCP, CLS, FID).
2. Limit `use client` hooks to small, specific components for Web API access.
3. Use **Docker** for containerization and ensure easy deployment.

### Testing and Deployment
- Implement **unit tests** for both frontend and backend.
- Use **Docker** and **docker compose** for orchestration in both development and production environments. Avoid using the obsolete `docker-compose` command.
- Ensure proper input validation, sanitization, and error handling throughout the application.

stack: