fail type inference at createStreamableValue

[toy-crane]

Description

follow this example at vercel AI example
https://sdk.vercel.ai/examples/next-app/basics/streaming-object-generation#server
createStreamableValue doesnt inferred although using stream.update(partialObject);

Code example

'use server';

import { streamObject } from 'ai';
import { openai } from '@ai-sdk/openai';
import { createStreamableValue } from 'ai/rsc';
import { z } from 'zod';

export async function generate(input: string) {
  'use server';

  const stream = createStreamableValue();

  (async () => {
    const { partialObjectStream } = await streamObject({
      model: openai('gpt-4-turbo'),
      system: 'You generate three notifications for a messages app.',
      prompt: input,
      schema: z.object({
        notifications: z.array(
          z.object({
            name: z.string().describe('Name of a fictional person.'),
            message: z.string().describe('Do not use emojis or links.'),
            minutesAgo: z.number(),
          }),
        ),
      }),
    });

    for await (const partialObject of partialObjectStream) {
      stream.update(partialObject);
    }

    stream.done();
  })();

  return { object: stream.value };
}

Additional context

how can I fix this problem?
are there anyone have same problem??

[lgrammel]

Can you provide the full error message?

[toy-crane]

(property) value: StreamableValue<any, any>
The value of the streamable. This can be returned from a Server Action and received by the client. To read the streamed values, use the readStreamableValue or useStreamableValue APIs.

there are no errors
The value is not just inferred instead of any.

[shuding]

Yeah createStreamableValue() can't infer its data type if data is set later with a .update() in a new clousure. I'm not sure if that's possible with TypeScript (example).

Only createStreamableValue<T>() and createStreamableValue(data) have the data type.

Let me know if you have other questions!