type-plus
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    Type Alias $<T, $O>

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

    🧰 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