Next.js and PDFKit stream to response problem - Stack Overflow

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I have a problem with next.js and PDFKit stream. When I create new PDFDocument, convert the stream into new Readable stream and push the data to response, client receives data when doc.end() is fired even though readableStream receives data immediately.

function convertStream(data: any): ReadableStream {
  const readableStream = new ReadableStream({
    start(controller) {
      data.on("data", (chunk: any) => {
        controller.enqueue(chunk);
      });

      data.on("end", () => {
        controller.close();
      });

      data.on("error", (err: Error) => {
        controller.error(err);
      });
    },
    cancel() {
      data.end();
    },
  });

  return readableStream;
}
    const doc = new PDFDocument();
const stream = convertStream(doc);

//doc content
doc.end();
return new Response(stream, headers);

When I use the same convert function on fs.createReadStream data is pushed to client right away. Please help.

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