no-unnecessary-type-parameter

Disallow type parameters that add no relationship or precision

A callable type parameter used once in its signature relates no input or output types.
Instead, you SHOULD use its constraint directly.

A type parameter remains useful when it appears in multiple signature positions or participates in another generic relation.

- Category: style
- Level: warning
- Fix: none
- Scope: module

Reported

function printValue<T: Display>(value: &readonly T): void {
    value.display();
}
Accepted

function choose<T: Display>(left: T, right: T): T {
    return left;
}
Prior art

- typescript-eslint · no-unnecessary-type-parameters

language/linter/src/rules/style/nounnecessarytypeparameter.rs:6