RegisterUnaryCallbackHandler typedef
The type of a custom Zone.registerUnaryCallback implementation function.
Receives the Zone that the handler was registered on as self,
a delegate forwarding to the handlers of self's parent zone as parent,
and the current zone where the error was uncaught as zone,
which will have self as a parent zone.
The function f is the function which was passed to the
which was passed to the Zone.registerUnaryCallback of zone.
The handler should return either the function f
or another function replacing f,
typically by wrapping f in a function
which does something extra before and after invoking f
The function must only access zone-related functionality through
self, parent or zone.
It should not depend on the current zone (Zone.current).
Implementation
typedef RegisterUnaryCallbackHandler =
ZoneUnaryCallback<R, T> Function<R, T>(
Zone self,
ZoneDelegate parent,
Zone zone,
R Function(T arg) f,
);