Node Event Loop Phases: Where Your setTimeout Really Runs
setTimeout zero and setImmediate are not the same thing, and which one runs first depends on where in the event loop you called them.
| Phase | Drains |
|---|---|
| timers | callbacks scheduled by setTimeout and setInterval whose deadline arrived |
| pending callbacks | deferred system callbacks, mostly I/O errors |
| idle, prepare | internal |
| poll | new I/O events, and where the loop blocks waiting for I/O |
| check | callbacks scheduled by setImmediate |
| close callbacks | socket and handle close events |
Published on debugly.dev by Rohit Bhadani | Founder of Krova Cloud
