RegisterBinaryCallbackHandler typedef Null safety

RegisterBinaryCallbackHandler = ZoneBinaryCallback<R, T1, T2> Function<R, T1, T2>(Zone self, ZoneDelegate parent, Zone zone, R f(T1 arg1, T2 arg2))

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);