interleaving.js

async function avery() {
  await null;
  for (let i = 0; i < 10; i += 1) {
    console.log('await');
    await null;
  }
}

function blake() {
  return new Promise((resolve) => {
    let i = 10;
    function tick() {
      if (i < 0) {
        return resolve();
      }
      i -= 1;
      console.log('setImmediate');
      setImmediate(tick);
    }
    setImmediate(tick);
  });
}

function clarke() {
  return new Promise((resolve) => {
    let i = 10;
    function tick() {
      if (i < 0) {
        return resolve();
      }
      i -= 1;
      console.log('nextTick');
      process.nextTick(tick);
    }
    process.nextTick(tick);
  });
}

function danny() {
  return new Promise((resolve) => {
    let i = 10;
    function tick() {
      if (i < 0) {
        return resolve();
      }
      i -= 1;
      console.log('setTimeout');
      setTimeout(tick, 0);
    }
    setTimeout(tick, 0);
  });
}

async function main() {
  return Promise.all([avery(), blake(), clarke(), danny()]);
}

main(); 

interleaving.txt

nextTick
nextTick
nextTick
nextTick
nextTick
nextTick
nextTick
nextTick
nextTick
nextTick
nextTick
await
await
await
await
await
await
await
await
await
await
setTimeout
setImmediate
setTimeout
setImmediate
setImmediate
setImmediate
setImmediate
setImmediate
setImmediate
setImmediate
setImmediate
setImmediate
setImmediate
setTimeout
setTimeout
setTimeout
setTimeout
setTimeout
setTimeout
setTimeout
setTimeout
setTimeout