ai/src/ui-message-stream/json-to-sse-transform-stream.ts

AI SDK by Vercel - The AI Toolkit for TypeScript and JavaScript

export class JsonToSseTransformStream extends TransformStream<unknown, string> {
  constructor() {
    super({
      transform(part, controller) {
        controller.enqueue(`data: ${JSON.stringify(part)}\n\n`);
      },
      flush(controller) {
        controller.enqueue('data: [DONE]\n\n');
      },
    });
  }
}