type PayloadHook = (payload: unknown, payloadModel: unknown) => Promise<unknown>;

function streamAnthropicCall(streamAnthropicMock: ReturnType<typeof vi.fn>): unknown[] {

const call = streamAnthropicMock.mock.calls.at(0);

const call = streamAnthropicMock.mock.calls[0];

if (!call) {

throw new Error("Expected streamAnthropic call");

}

function streamTransportOptions(

streamAnthropicMock: ReturnType<typeof vi.fn>,

): Record<string, unknown> {

const options = streamAnthropicCall(streamAnthropicMock).at(2);

const options = streamAnthropicCall(streamAnthropicMock)[2];

if (!options || typeof options !== "object") {

throw new Error("Expected streamAnthropic transport options");

}