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/Dart 2

RegisterCallbackHandler typedef

ZoneCallback<R> RegisterCallbackHandler <R>(Zone self, ZoneDelegate parent, Zone zone, R f())

Implementation

typedef RegisterCallbackHandler = ZoneCallback<R> Function<R>(
    Zone self, ZoneDelegate parent, Zone zone, R Function() f);

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