Design TypeScript generics as functions between types with constraints.
npx skills add https://github.com/luyi985/lyi-bash --skill generics-as-functions
Please help me install this Agent Skill. Skill: generics-as-functions Source: https://github.com/luyi985/lyi-bash/tree/main/ai/skills/generics-as-functions Command: npx skills add https://github.com/luyi985/lyi-bash --skill generics-as-functions
Generics are powerful but can become hard to reason about when used without a clear mental model. This Skill helps you treat generics as functions between types to design safer, more reusable type-level constructs in TypeScript.
Define a constrained generic type and demonstrate its usage with an example like picking a subset of properties from a type.
High-intent search queries and answers about installing and using this skill.
TypeScript generics are constrained using the extends keyword on type parameters, ensuring inputs meet specific structural requirements. This approach treats generics as functions that validate and transform type-level inputs before returning derived types.
The generics-as-functions model treats TypeScript generics as functions mapping input types to output types. This framework clarifies complex type-level constructs like mapped types and conditional types by viewing type parameters as function arguments and return types.
Documenting generic type utilities with TSDoc requires annotating type parameters, constraints, and return behavior above the type declaration. This practice ensures strong developer experience when reusing utilities like Partial and Pick across type-level codebases.
Use keyof to extract union types from object keys and mapped types to iterate over them, creating reusable utilities. Combined with the generics-as-functions approach, this enables constructing type-level transformations like Pick and Partial safely.
Conditional types should be used when generic type-level logic needs to branch based on input type relationships. They allow TypeScript generics to behave like functions with conditional logic, returning different types depending on how constraints and extends clauses evaluate.
Yes, understanding conditional types, keyof, and mapped types is required to design advanced TypeScript generics effectively. These features form the foundation for treating generics as functions that perform complex type-level transformations and constraints.
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