Write idiomatic TypeScript patterns for clean, maintainable code. Use when writing or refactoring TypeScript classes, functions, modules, or async logic.
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What the file says
# TypeScript Best Practices
## **Priority: P1 (HIGH)**
## Implementation Guidelines
- **Naming**: Use **`PascalCase`** for Classes/Types/Interfaces, **`camelCase`** for variables/functions, and **`UPPER_SNAKE`** for static constants.
- **Functions**: Use **`arrow functions`** for callbacks/logic; **`function declaration`** for top-level exports. Always type **`public API`** returns.
- **Modules**: Use **`Named exports`** ONLY to enable better refactoring/auto-imports.
- **Async**: Use **`async/await`** with **`Promise.all()`** for parallel execution. Implement **`try-catch`** for error handling; type **`catch(e) as unknown`** and narrow before use. Avoid **`.then().catch()`** chains.
- **Classes**: Explicitly use **`private`**, **`protected`**, and **`public`** modifiers. Favor **`composition`** over inheritance and **`dependency injection`** with **`constructor injection`** and interfaces over singletons for testability.
- **Type Safety**: Use **`never`** for exhaustiveness checks in switch-cases.
- **Optional**: Use **`optional chaining`** (`?.`) and **`nullish coalescing`** (`??`) over manual checks.
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The line at the top of this page pins the label git:20260714.6bf9b5e, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_sghd7llx6ahu3sem
GET https://markdownregistry.com/api/v1/resolve?ref=hoangnguyen0403/agent-skills-standard/typescript-best-practices
GET https://markdownregistry.com/api/v1/blob/ef35ad528a09395e0f439e0e2fc70e69f9b1da7732149e2d0e234be23d500b0a
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