}

function firstMockArg(mock: { mock: { calls: unknown[][] } }, label: string): unknown {

const arg = mock.mock.calls.at(0)?.at(0);

const arg = mock.mock.calls[0]?.[0];

if (arg === undefined) {

throw new Error(`Expected ${label}`);

}

return arg;

}

function respondCall(respond: ReturnType<typeof vi.fn>): RespondCall {

const call = respond.mock.calls.at(0) as RespondCall | undefined;

const call = respond.mock.calls[0] as RespondCall | undefined;

if (!call) {

throw new Error("expected respond call");

}