Consider the following change

[GrosSacASac]

Make A not a top level

import {QuickReader} from '[quickreader](https://github.com/EtherDream/QuickReader.git)'

const res = await fetch('https://unpkg.com/quickreader-demo/demo.bin')
const stream = res.body   // ReadableStream
const [reader, A] = QuickReader(stream) // now returns an array with both

do {
  const id   = reader.u32() ?? await A
  const name = reader.txt() ?? await A
  const age  = reader.u8()  ?? await A

  console.log(id, name, age)

} while (!reader.eof)

[EtherDream]

I plan to use the Reader instance as the thenable object later, which is simpler, e.g.

  const id   = reader.u32() ?? await reader
  const name = reader.txt() ?? await reader
  const age  = reader.u8()  ?? await reader