emptyTypeParameterLists

Reports empty type parameter lists in type aliases and interfaces.

✅ This rule is included in the ts stylistic and stylisticStrict presets.

TypeScript permits empty type parameter lists like <>, but this practice is unnecessary. Empty type parameter lists can lead to unclear or ambiguous code where the intention is not self-evident.

Examples

❌ Incorrect

type Foo<> = string;

interface Bar<> {}

type Generic<> = { value: number };

✅ Correct

type Foo = string;

interface Bar {}

type Generic<T> = T;

interface Container<T> {
  value: T;
}

Options

This rule is not configurable.

When Not To Use It

If your codebase intentionally uses empty type parameter lists for specific tooling or code generation purposes, you may disable this rule.

Further Reading

• TypeScript Handbook: Generics

Equivalents in Other Linters

• Biome: noEmptyTypeParameters