deno_lint logodeno_lint

All rules/no-empty-interface

Disallows the declaration of an empty interface

An interface with no members serves no purpose. Either the interface extends another interface, in which case the supertype can be used, or it does not extend a supertype in which case it is the equivalent to an empty object. This rule will capture these situations as either unnecessary code or a mistaken empty implementation.


interface Foo {}
interface Foo extends Bar {}


interface Foo {
  name: string;

interface Bar {
  age: number;

// Using an empty interface as a union type is allowed
interface Baz extends Foo, Bar {}