orElseForUndefinable
Return input as T if the passed input is not undefined.
Otherwise, return the result of recoverer.
function orElseForUndefinable<T>(input: Undefinable<T>, recoverer: UndefinableTryRecoveryFn<T>): Undefinable<T>;
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orElseForUndefinable<T>(input: Undefinable<T>, recoverer: UndefinableTryRecoveryFn<T>): Undefinable<T>
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