}

function firstCallArg(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 firstBuildChannelsTableCall(): unknown[] {

const call = mocks.buildChannelsTable.mock.calls.at(0);

const call = mocks.buildChannelsTable.mock.calls[0];

if (!call) {

throw new Error("expected buildChannelsTable call");

}