tick.js

function timeout() {
  console.log("timeout");
  process.nextTick(function() {
    console.log("nexttick set by timer");
  });
}

function tick() {
  for (var i = 0; i < 1e6; i++) {}
  console.log("nexttick set by nexttick");
  process.nextTick(tick);
}

process.nextTick(tick);
setInterval(timeout, 0);