type ExactAssistantMessage = Parameters<

typeof appendExactAssistantMessageToSessionTranscript

>[0]["message"];

type TranscriptUpdateEmitterSpy = {

mock: {

calls: [string | SessionTranscriptUpdate][];

};

};

function writeTranscriptStore() {

fs.writeFileSync(

};

}

function requireTranscriptUpdateCall(spy: TranscriptUpdateEmitterSpy): SessionTranscriptUpdate {

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

if (!call) {

throw new Error("expected transcript update event");

}

const event = call[0];

if (typeof event === "string") {

throw new Error("expected structured transcript update event");

}

return event;

}

it("creates transcript file and appends message for valid session", async () => {

writeTranscriptStore();

const sessionFile = resolveSessionTranscriptPathInDir(sessionId, fixture.sessionsDir());

expect(emitSpy).toHaveBeenCalledTimes(1);

const [event] = emitSpy.mock.calls[0] as [SessionTranscriptUpdate];

const event = requireTranscriptUpdateCall(emitSpy);

const message = event.message as

| {

role?: string;