dynamic callback()
) Registers the given callback in this zone.
It is good practice to register asynchronous or delayed callbacks before invoking run. This gives the zone a chance to wrap the callback and to store information with the callback. For example, a zone may decide to store the stack trace (at the time of the registration) with the callback.
Returns a potentially new callback that should be used in place of the
given callback.
Source
/**
* Registers the given callback in this zone.
*
* It is good practice to register asynchronous or delayed callbacks before
* invoking [run]. This gives the zone a chance to wrap the callback and
* to store information with the callback. For example, a zone may decide
* to store the stack trace (at the time of the registration) with the
* callback.
*
* Returns a potentially new callback that should be used in place of the
* given [callback].
*/
ZoneCallback registerCallback(callback());