dart:async

RegisterBinaryCallbackHandler typedef

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

Source 

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

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https://api.dartlang.org/stable/1.24.3/dart-async/RegisterBinaryCallbackHandler.html