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noEmptyTypeParameters

Diagnostic Category: lint/complexity/noEmptyTypeParameters

Since: v1.5.0

Disallow empty type parameters in type aliases and interfaces.

TypeScript permits the use of empty type parameter lists in type alias and interface declarations; however, this practice is generally discouraged. Allowing empty type parameter lists can lead to unclear or ambiguous code, where the intention of the generic type is not self-evident. This rule disallows empty type parameter lists in type alias and interface declarations.

interface Foo<> {}
code-block.ts:1:14 lint/complexity/noEmptyTypeParameters ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Using an empty type parameter list is confusing.

> 1 │ interface Foo<> {}
^^
2 │

Remove the empty type parameter list or add a type parameter.

type Bar<> = {};
code-block.ts:1:9 lint/complexity/noEmptyTypeParameters ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Using an empty type parameter list is confusing.

> 1 │ type Bar<> = {};
^^
2 │

Remove the empty type parameter list or add a type parameter.

interface Foo {}
type Foo<T> = {
bar: T;
}