avoid-unnecessary-type-params

SKILL.md

The "Golden Rule of Generics" states that type parameters should appear twice or more in a function signature. If a type parameter only appears once, it's not relating anything and is likely unnecessary. Unnecessary type parameters create a false sense of type safety and can make inference less successful.

This skill helps you identify and eliminate superfluous type parameters, resulting in cleaner, more maintainable code that TypeScript can infer more effectively.

Type parameters must appear twice or more to establish a relationship. If a type parameter only appears once, strongly reconsider if you need it.

Use when writing generic functions or types. Use when reviewing type signatures. Use when a type parameter only appears once. Use when tempted to add generics for "flexibility". Source: marius-townhouse/effective-typescript-skills.

View raw