---
title: "IDE Rule: Typescript"
platform: "Promptally"
canonical_url: "https://app.promptally.dev/p/spec-ide-rule-typescript"
modality: "IDE_RULE"
category: "Framework IDE Rules"
compatible_models: [Universal / Model Agnostic]
access_tier: "Free Public Artifact (No Auth Required)"
license: "MIT"
---

# IDE Rule: Typescript

**Summary:** IDE Rule: Typescript is a verified IDE RULE blueprint on Promptally in Framework IDE Rules optimized for leading AI models. Cursorrules Mdc specification for IDE Rule: Typescript. Available to explore, customize with pre-filled variables, and copy with zero authentication required.

## Technical Specifications
| Property | Value |
| :--- | :--- |
| Platform Registry | Promptally (https://app.promptally.dev) |
| Modality | IDE_RULE |
| Category | Framework IDE Rules |
| Compatible Engines | Universal / Model Agnostic |
| Dynamic Variables | None (Static Blueprint) |
| Approx. Token Length | 517 |
| Access Tier | Free Public Artifact (No Auth Required) |
| License | MIT |

### Pre-Filled Template & Production Source

```mdc
---
description: "TypeScript coding standards and best practices for modern web development"
globs: **/*.ts, **/*.tsx, **/*.d.ts
alwaysApply: false
---
# TypeScript Best Practices

## Type System
- Prefer interfaces over types for object definitions
- Use type for unions, intersections, and mapped types
- Avoid using `any`, prefer `unknown` for unknown types
- Use strict TypeScript configuration
- Leverage TypeScript's built-in utility types
- Use generics for reusable type patterns

## Naming Conventions
- Use PascalCase for type names and interfaces
- Use camelCase for variables and functions
- Use UPPER_CASE for constants
- Use descriptive names with auxiliary verbs (e.g., isLoading, hasError)
- Prefix interfaces for React props with 'Props' (e.g., ButtonProps)

## Code Organization
- Keep type definitions close to where they're used
- Export types and interfaces from dedicated type files when shared
- Use barrel exports (index.ts) for organizing exports
- Place shared types in a `types` directory
- Co-locate component props with their components

## Functions
- Use explicit return types for public functions
- Use arrow functions for callbacks and methods
- Implement proper error handling with custom error types
- Use function overloads for complex type scenarios
- Prefer async/await over Promises

## Best Practices
- Enable strict mode in tsconfig.json
- Use readonly for immutable properties
- Leverage discriminated unions for type safety
- Use type guards for runtime type checking
- Implement proper null checking
- Avoid type assertions unless necessary

## Error Handling
- Create custom error types for domain-specific errors
- Use Result types for operations that can fail
- Implement proper error boundaries
- Use try-catch blocks with typed catch clauses
- Handle Promise rejections properly

## Patterns
- Use the Builder pattern for complex object creation
- Implement the Repository pattern for data access
- Use the Factory pattern for object creation
- Leverage dependency injection
- Use the Module pattern for encapsulation

```

## Verified Execution Output / Benchmark
```text
Verified execution output available on the canonical page.
```

## Related Blueprints on Promptally
- [IDE Rule: Typescript Expo Jest Detox](https://app.promptally.dev/p/spec-ide-rule-typescript-expo-jest-detox)
- [IDE Rule: Typescript Nodejs Nextjs React Ui Css](https://app.promptally.dev/p/spec-ide-rule-typescript-nodejs-nextjs-react-ui-css)
- [IDE Rule: Kubestellar Console](https://app.promptally.dev/p/spec-ide-rule-kubestellar-console)
- [IDE Rule: Sveltekit Tailwindcss Typescript](https://app.promptally.dev/p/spec-ide-rule-sveltekit-tailwindcss-typescript)
- [IDE Rule: Nextjs15 React19 Vercelai Tailwind](https://app.promptally.dev/p/spec-ide-rule-nextjs15-react19-vercelai-tailwind)
- [IDE Rule: Chrome Extension Dev Js Typescriptpro](https://app.promptally.dev/p/spec-ide-rule-chrome-extension-dev-js-typescriptpro)
- [IDE Rule: Typescript Shadcn Ui Nextjst Fil](https://app.promptally.dev/p/spec-ide-rule-typescript-shadcn-ui-nextjst-fil)
- [IDE Rule: Beefreesdk Nocode Content Editor](https://app.promptally.dev/p/spec-ide-rule-beefreesdk-nocode-content-editor)