Passing a provider as a generic type

[niels-hb]

Hello Riverpod community,

I'm trying to create a generic widget that receives a provider as the constructor argument and watches this provider in the build method of the Widget.

The signature of the provider looks like this:

@riverpod
Future<TimeSeries> bookingStatistics(Ref, DateTimeRange, TimeSeriesFilterResolution)

@riverpod
Future<TimeSeries> incomeStatistics(Ref, DateTimeRange, TimeSeriesFilterResolution)

// And so on. The providers connect to different endpoints internally but are otherwise identical.

The widget's constructor:

class Chart extends ConsumerStatefulWidget {
  const Chart({
    required this.provider,
  });

  final BookingStatisticsFamily provider;

  [...]
}

The consumer:

Widget _buildChart() => ref
    .watch(widget.provider(_range, _resolution))
    .when([...]);

As you can see, I chose the type "BookingStatisticsFamily" as I wasn't sure if there are any supertypes available that would match any provider with the given return type and arguments.

My question is twofold:

1. Is what I'm trying to achieve considered an anti-pattern and should I therefore rethink my approach?
2. If it's not an anti-pattern, what would be the correct type declaration to use here?

[rmkubala]

@niels-hb Have you tried setting the type as ProviderBase?
In your example:

class Chart extends ConsumerStatefulWidget {
  const Chart({
    required this.provider,
  });

  final ProviderBase<AsyncValue<TimeSeries>> provider;

  [...]
}