Guides writing type-safe, idiomatic TypeScript code following modern conventions.
npx skills add https://github.com/alatyshau/duet --skill typescript-alatyshau
Please help me install this Agent Skill. Skill: typescript Source: https://github.com/alatyshau/duet/tree/main/packages/skills/coding/typescript Command: npx skills add https://github.com/alatyshau/duet --skill typescript-alatyshau
any usage, non-exhaustive switch handling, and implicit return types. ## Core Features & Use Cases - Type Safety Rules: Enforces explicit return types on exports, unknown over any, and discriminated unions for result types. - Idiomatic Patterns: Provides const assertions, exhaustive checks with never, and branded types for domain safety. - Project Conventions: Standardizes barrel exports, separate type imports, and flags anti-patterns like unjustified as assertions and enums. - Use Case: When asking an AI to implement a new service module, this Skill ensures the output uses discriminated union result types, exhaustive error handling, and clean barrel exports matching your codebase style. ## Quick Start Write a TypeScript user service with type-safe error handling following the typescript skill conventions.High-intent search queries and answers about installing and using this skill.
Use explicit return types on exported functions, prefer unknown over any for unvalidated input, and model outcomes with discriminated unions. Validate unknown data with type guards before use instead of casting with as.
Define a Result type as a union of success and error variants distinguished by a status field. Consume it with a switch statement and add a never-typed exhaustive check in the default branch so the compiler flags unhandled cases.
Prefer string literal unions or const objects over enums. Const assertions like `as const` on an array produce literal types that are simpler, tree-shakeable, and avoid the runtime quirks of TypeScript enums.
Any is acceptable only with explicit justification, such as interfacing with untyped third-party code. In all other cases use unknown and narrow with type guards, since any silently disables type checking across the codebase.
Branded types attach a unique symbol to a primitive, such as `type UserId = string & { readonly brand: unique symbol }`, preventing accidental mixing of semantically different strings like user IDs and order IDs at compile time.
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