Function
The type returned by the callback.
The callback to run outside the tracking context.
Whatever the callback returns.
Read signals without subscribing to them. Signals read inside the callback are not recorded
as dependencies of the surrounding @effect, so changing them later will not re-run it. Use it when an
effect needs a value to compute with but should not fire when that value changes — reading a current
index or a configuration flag, say, while only tracking the data being rendered.
untrack