Apply generic constraints and mapped types in TypeScript code.
npx skills add https://github.com/djankies/claude-configs --skill using-generics
Please help me install this Agent Skill. Skill: using-generics Source: https://github.com/djankies/claude-configs/tree/main/typescript/skills/using-generics Command: npx skills add https://github.com/djankies/claude-configs --skill using-generics
Teaches generic constraints, avoiding any in generic defaults, and mapped types in TypeScript.
Create a generic function with constraints and a mapped type example.
High-intent search queries and answers about installing and using this skill.
Use generics with constraints to write reusable functions while maintaining type safety. Constraints ensure the function receives only compatible types, preventing runtime errors and enabling IDE autocomplete. This approach works across frontend and library code.
Generic constraints restrict what types a generic parameter can accept, enforcing safety at compile time. Avoid using `any` as a default; instead use mapped types to transform types safely while preserving specificity and preventing type-safety gaps.
Mapped types iterate over object properties to create new types dynamically, enabling robust type transformations without repetition. Combined with generics and constraints, they enforce type safety across reusable APIs and libraries.
Yes. Generic constraints work with classes, functions, and APIs by restricting type parameters at the API boundary. This ensures type-safe reusable classes and generic APIs that validate input types upfront.
Using `any` as a generic default bypasses type safety and defeats the purpose of constraints. Instead, use mapped and conditional types to provide sensible defaults while maintaining strict type checking throughout your codebase.
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