Undefined

Undefined<Type>

A generic type Undefined indicates generic type variable Type as undefined. It takes generic type variable Type causing other types than undefined its change to never.

undefined.type.ts

type Undefined<Type> = Type extends undefined ? Type : never;

type/src/type/undefined.type.ts at main · angular-package/typeGitHub

Generic type variables

Type

Generic type variable that cannot be different than undefined.