reactive/Ix.NET/Source/System.Interactive.Async/IAsyncGrouping.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information. 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace System.Linq
{
    public interface IAsyncGrouping<out TKey, out TElement> : IAsyncEnumerable<TElement>
    {
        TKey Key { get; }
    }
}