# Timers

> The setTimeout, setInterval, setImmediate, and queueMicrotask globals.

`setTimeout`, `setInterval`, `setImmediate`, their `clear*` counterparts, and `queueMicrotask` are globals.

## Differences from browsers

- Timers return Node `Timeout` or `Immediate` objects, not numbers, with `ref()`, `unref()`, `hasRef()`, and
  `refresh()` (`Timeout` only).
- String handlers are not supported; the callback must be callable.
- At a checkpoint, callbacks run in this order:
  1. `process.nextTick`
  2. Promise and `queueMicrotask` callbacks, in enqueue order
  3. `setImmediate`
  4. Zero-delay timers