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/Dart 2

RegisterUnaryCallbackHandler typedef

ZoneUnaryCallback<R, T> RegisterUnaryCallbackHandler <R, T>(Zone self, ZoneDelegate parent, Zone zone, R f(T arg))

Implementation

typedef RegisterUnaryCallbackHandler = ZoneUnaryCallback<R, T> Function<R, T>(
    Zone self, ZoneDelegate parent, Zone zone, R Function(T arg) f);

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https://api.dart.dev/stable/2.5.0/dart-async/RegisterUnaryCallbackHandler.html