Available on macro
Per-iteration callback.
See also:
https://aantron.github.io/luv/luv/Luv/Idle
@:noExprstaticinit(loop:Loop):Result<Idle>
Allocate and initialize an idle handle.
The handle should be cleaned up with eval.luv.Handle.close when no longer needed.
eval.luv.Handle.close
@:noExprstaticstart(this:Idle, callback:() ‑> Void):Result<NoData>
Starts the handle with the given callback.
@:noExprstaticstop(this:Idle):Result<NoData>
Stops the handle.