Type Alias AnswerHasRows<A>

AnswerHasRows: [RowsListOf<A>] extends [never]
    ? [{ readonly [K in keyof A]: RowsListOf<A[K]> }[keyof A]] extends [
        never,
    ]
        ? false
        : true
    : true

Whether an action's answer carries rows: as the answer itself, or as one of its fields.