Allow multiple readers to iterate over a stream at the same time

What is the problem this feature will solve?

When multiple callers use Readable[Symbol.asyncIterator], each caller receives a partial result.

import {Readable} from 'node:stream'

const stream = Readable.from(['a', 'b', 'c'])

const iterate = async (readerName) => {
  for await (const chunk of stream) {
    console.log(readerName, chunk)
  }
}

await Promise.all([
  iterate('one'),
  iterate('two'),
])

one a
two b
one c

Some callers might expect that result. But others might expect the following result instead.

one a
two a
one b
two b
one c
two c

What is the feature you are proposing to solve the problem?

Adding an option to readable.iterator() to use readable.on('data') instead of readable.read(). This would enable the above behavior.

What alternatives have you considered?

Implementing this user-land.

See an example of it at https://github.com/sindresorhus/get-stream/pull/121

Commencez dans lib/internal/streams/readable.js, au niveau de Readable[Symbol.asyncIterator], et examinez comment readable.iterator() consomme actuellement le stream. Comparez le comportement proposé de data-event avec l’exemple fourni d’itération concurrente ; terminé signifie qu’une option est définie et que plusieurs lecteurs reçoivent chaque chunk comme documenté.