Type Alias $<T, $O>

$: IsUndefined.$<
    T,
    {
        $else: NotAssignable.$<T, void, $O>;
        $then: $ResolveBranch<$O, [$Then], T>;
    },
>

🧰 type util

Validate if T is undefined.

This is a type util for building custom types. It does not check against special types.

Type Parameters

T
$O extends IsNotVoid.$UtilOptions