Support Uint8Array values for zero-copy transfer to worker_threads

[akaNightmare]

Motivation

Currently, Redis values are returned as Buffer, which requires manual conversion or copying when sending data to worker_threads.
To enable zero-copy transfer, it would be great to support Uint8Array as a return type.
Internally, the implementation may use new TextEncoder().encode(redisRes) or similar logic when encoding strings to Uint8Array.

Basic Code Example

const redis = await createClient({ url: 'redis://localhost:7777' })
        .on("error", (err) => console.log("Redis Client Error", err))
        .connect();

    const rawData = await fs.readFile('./package.json');

    await redis.set('__foo1', rawData);

    const res = await redis.withTypeMapping({
        [RESP_TYPES.BLOB_STRING]: Uint8Array,
    }).get('__foo1');

    worker.postMessage(res, [res.buffer]);

[nkaradzhov]

Hi @akaNightmare, thanks for the suggestion. It is a good suggestion, although at this moment this is probably not going to be prioritized. I will see if i can find some time these next couple of weeks, but its unlikely. In the mean time, feel free to open a PR

[akaNightmare]

will try to realize it

[umeshmore45]

I've implemented this feature and submitted PR #3183 for review.

The implementation adds Uint8Array support while maintaining full backward compatibility. Buffer remains the default type, and Uint8Array is opt-in via withTypeMapping().

Example usage:

const data = await client
  .withTypeMapping({ [RESP_TYPES.BLOB_STRING]: Uint8Array })
  .get('key');

worker.postMessage(data, [data.buffer]);

Happy to address any feedback or make adjustments as needed.