RegisterBinaryCallbackHandler typedef
The type of a custom Zone.registerBinaryCallback 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.registerBinaryCallback 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
Implementation
typedef RegisterBinaryCallbackHandler =
ZoneBinaryCallback<R, T1, T2> Function<R, T1, T2>(
Zone self,
ZoneDelegate parent,
Zone zone,
R Function(T1 arg1, T2 arg2) f,
);