Type Alias Flip<$Options>

Flip: { $else: $Options["$then"]; $then: $Options["$else"] } & Omit<
    $Options,
    "$then"
    | "$else",
>

Flip the selection options.

type IsBoolean<T, $Options = $SelectionOptions> = ...

type IsNotBoolean<T, $Options = $SelectionOptions> = IsBoolean<T, $FlipSelection<$Options>>