mergen

An async generator that, given n async generators, yields the values from the n generators, in the order in which they arrived.

usage:

const {mergen} = require('mergen');

function timer(time = 500) {
  return new Promise(resolve => setTimeout(() => resolve(), time));
}

async function* gen1() {
  await timer(100);
  yield 1;
  await timer(300);
  yield 4;
}

async function* gen2() {
  await timer(200);
  yield 2;
  await timer(100);
  yield 3;
}

async function printGen(gen) {
  let max = 10;
  for await (x of gen) {
    if (x) console.log('Next up:', x);
    if (--max <= 0) break;
  }
}

printGen(mergen(gen1(), gen2()));
// should output:
// 1
// 2
// 3
// 4

obviously... make sure you're using a node version that supports async generators or some babel magic.