This ReadableStream did not return bytes.

export default defineEventHandler(async (event) => {

    setResponseHeader(event, "Content-Type", "text/event-stream");
    setResponseHeader(event, "Cache-Control", "no-cache");
    setResponseHeader(event, "Transfer-Encoding", "chunked");

    const stream = new ReadableStream({
        async start(controller) {
            controller.enqueue(JSON.stringify({ type: 'message', role:"user", content:"HELLO" }) + '\n')
            controller.close()
        }
    })

    return stream
})