reactive/AsyncRx.NET/System.Reactive.Async/Linq/IGroupedAsyncObservable.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT License.
// See the LICENSE file in the project root for more information. 

namespace System.Reactive.Linq
{
    public interface IGroupedAsyncObservable<out TKey, out TElement> : IAsyncObservable<TElement>
    {
        TKey Key { get; }
    }
}