The answer
For deferring to the next tick, setImmediate is often clearer in intent and runs right after I/O events are processed. It is preferred over setTimeout(0) when the intent is to run code after the current event loop cycle's I/O.
What Does setTimeout(0) Actually Do in Node.js?
Is setImmediate better than setTimeout(0) in Node.js?
More FAQs in What Does setTimeout(0) Actually Do in Node.js?
No. It defers the callback to the timers phase of the next event loop tick, after the current stack and all microtasks (promise callbacks) complete. It is deferred, not instant.
It schedules the callback to run in the timers phase of the next event loop tick. The current code finishes, microtasks run, then the timer callback runs. It is a way to defer work to the next tick.
setImmediate runs in the check phase, right after the poll phase, while setTimeout(0) runs in the timers phase. In most cases on the next tick, setImmediate runs before setTimeout(0), but the exact order depends on context.
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