@thi.ng/transducers-async/internal/iter.js

Async versions of various highly composable transducers, reducers and iterators

const __inflightIters = (iters) => iters.map((iter) => iter.iter.next().then((res) => ({ iter, res })));
const __iterNext = (promises, iter) => {
  promises[iter.id] = iter.iter.next().then((res) => ({ res, iter }));
};
const __iterRemove = (iters, id) => {
  iters.splice(id, 1);
  const n = iters.length;
  if (!n) return true;
  for (let i = id; i < n; i++) iters[i].id--;
};
export {
  __inflightIters,
  __iterNext,
  __iterRemove
};