// This file contains auto-generated code.
// Generated from `System.Linq.AsyncEnumerable, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a`.
namespace System
{
    namespace Linq
    {
        public static class AsyncEnumerable
        {
            public static System.Threading.Tasks.ValueTask<TSource> AggregateAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TSource>> func, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> AggregateAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TSource, TSource> func, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TAccumulate> AggregateAsync<TSource, TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TAccumulate seed, System.Func<TAccumulate, TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TAccumulate>> func, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TAccumulate> AggregateAsync<TSource, TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TAccumulate seed, System.Func<TAccumulate, TSource, TAccumulate> func, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TResult> AggregateAsync<TSource, TAccumulate, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TAccumulate seed, System.Func<TAccumulate, TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TAccumulate>> func, System.Func<TAccumulate, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TResult> AggregateAsync<TSource, TAccumulate, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TAccumulate seed, System.Func<TAccumulate, TSource, TAccumulate> func, System.Func<TAccumulate, TResult> resultSelector, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey, TAccumulate>> AggregateBy<TSource, TKey, TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Func<TKey, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TAccumulate>> seedSelector, System.Func<TAccumulate, TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TAccumulate>> func, System.Collections.Generic.IEqualityComparer<TKey> keyComparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey, TAccumulate>> AggregateBy<TSource, TKey, TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, TAccumulate seed, System.Func<TAccumulate, TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TAccumulate>> func, System.Collections.Generic.IEqualityComparer<TKey> keyComparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey, TAccumulate>> AggregateBy<TSource, TKey, TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Func<TKey, TAccumulate> seedSelector, System.Func<TAccumulate, TSource, TAccumulate> func, System.Collections.Generic.IEqualityComparer<TKey> keyComparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey, TAccumulate>> AggregateBy<TSource, TKey, TAccumulate>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, TAccumulate seed, System.Func<TAccumulate, TSource, TAccumulate> func, System.Collections.Generic.IEqualityComparer<TKey> keyComparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Threading.Tasks.ValueTask<bool> AllAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<bool> AllAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<bool> AnyAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<bool> AnyAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<bool> AnyAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Append<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TSource element) => throw null;
            public static System.Threading.Tasks.ValueTask<decimal> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<decimal> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<double> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<double> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<double> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<int> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<double> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<long> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<decimal?> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<decimal?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<double?> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<double?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<double?> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<int?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<double?> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<long?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<float?> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<float?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<float> AverageAsync(this System.Collections.Generic.IAsyncEnumerable<float> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Cast<TResult>(this System.Collections.Generic.IAsyncEnumerable<object> source) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource[]> Chunk<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, int size) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Concat<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TSource> second) => throw null;
            public static System.Threading.Tasks.ValueTask<bool> ContainsAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TSource value, System.Collections.Generic.IEqualityComparer<TSource> comparer = default(System.Collections.Generic.IEqualityComparer<TSource>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<int> CountAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<int> CountAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<int> CountAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey, int>> CountBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey> keyComparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey, int>> CountBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> keyComparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> DefaultIfEmpty<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> DefaultIfEmpty<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TSource defaultValue) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Distinct<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Collections.Generic.IEqualityComparer<TSource> comparer = default(System.Collections.Generic.IEqualityComparer<TSource>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> DistinctBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> DistinctBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> ElementAtAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Index index, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> ElementAtAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, int index, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> ElementAtOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Index index, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> ElementAtOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, int index, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Empty<TResult>() => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Except<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TSource> second, System.Collections.Generic.IEqualityComparer<TSource> comparer = default(System.Collections.Generic.IEqualityComparer<TSource>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> ExceptBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TKey> second, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> ExceptBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TKey> second, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> FirstAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> FirstAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> FirstAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> FirstOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> FirstOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, TSource defaultValue, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> FirstOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> FirstOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, TSource defaultValue, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> FirstOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> FirstOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TSource defaultValue, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Linq.IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Linq.IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Linq.IGrouping<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TElement>> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> GroupBy<TSource, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Func<TKey, System.Collections.Generic.IEnumerable<TSource>, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<System.Linq.IGrouping<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Func<TSource, TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> GroupBy<TSource, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Func<TKey, System.Collections.Generic.IEnumerable<TSource>, TResult> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> GroupBy<TSource, TKey, TElement, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TElement>> elementSelector, System.Func<TKey, System.Collections.Generic.IEnumerable<TElement>, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> GroupBy<TSource, TKey, TElement, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Func<TSource, TElement> elementSelector, System.Func<TKey, System.Collections.Generic.IEnumerable<TElement>, TResult> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TOuter> outer, System.Collections.Generic.IAsyncEnumerable<TInner> inner, System.Func<TOuter, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> outerKeySelector, System.Func<TInner, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> innerKeySelector, System.Func<TOuter, System.Collections.Generic.IEnumerable<TInner>, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TOuter> outer, System.Collections.Generic.IAsyncEnumerable<TInner> inner, System.Func<TOuter, TKey> outerKeySelector, System.Func<TInner, TKey> innerKeySelector, System.Func<TOuter, System.Collections.Generic.IEnumerable<TInner>, TResult> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<(int Index, TSource Item)> Index<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<T> InfiniteSequence<T>(T start, T step) where T : System.Numerics.IAdditionOperators<T, T, T> => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Intersect<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TSource> second, System.Collections.Generic.IEqualityComparer<TSource> comparer = default(System.Collections.Generic.IEqualityComparer<TSource>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> IntersectBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TKey> second, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> IntersectBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TKey> second, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Join<TOuter, TInner, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TOuter> outer, System.Collections.Generic.IAsyncEnumerable<TInner> inner, System.Func<TOuter, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> outerKeySelector, System.Func<TInner, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> innerKeySelector, System.Func<TOuter, TInner, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Join<TOuter, TInner, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TOuter> outer, System.Collections.Generic.IAsyncEnumerable<TInner> inner, System.Func<TOuter, TKey> outerKeySelector, System.Func<TInner, TKey> innerKeySelector, System.Func<TOuter, TInner, TResult> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> LastAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> LastAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> LastAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> LastOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> LastOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, TSource defaultValue, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> LastOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> LastOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, TSource defaultValue, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> LastOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> LastOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TSource defaultValue, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> LeftJoin<TOuter, TInner, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TOuter> outer, System.Collections.Generic.IAsyncEnumerable<TInner> inner, System.Func<TOuter, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> outerKeySelector, System.Func<TInner, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> innerKeySelector, System.Func<TOuter, TInner, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> LeftJoin<TOuter, TInner, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TOuter> outer, System.Collections.Generic.IAsyncEnumerable<TInner> inner, System.Func<TOuter, TKey> outerKeySelector, System.Func<TInner, TKey> innerKeySelector, System.Func<TOuter, TInner, TResult> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Threading.Tasks.ValueTask<long> LongCountAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<long> LongCountAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<long> LongCountAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> MaxAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Collections.Generic.IComparer<TSource> comparer = default(System.Collections.Generic.IComparer<TSource>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> MaxByAsync<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> MaxByAsync<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> MinAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Collections.Generic.IComparer<TSource> comparer = default(System.Collections.Generic.IComparer<TSource>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> MinByAsync<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> MinByAsync<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> OfType<TResult>(this System.Collections.Generic.IAsyncEnumerable<object> source) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<T> Order<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, System.Collections.Generic.IComparer<T> comparer = default(System.Collections.Generic.IComparer<T>)) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<TSource> OrderBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>)) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<TSource> OrderBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>)) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<TSource> OrderByDescending<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>)) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<TSource> OrderByDescending<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>)) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<T> OrderDescending<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, System.Collections.Generic.IComparer<T> comparer = default(System.Collections.Generic.IComparer<T>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Prepend<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TSource element) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<int> Range(int start, int count) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Repeat<TResult>(TResult element, int count) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Reverse<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> RightJoin<TOuter, TInner, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TOuter> outer, System.Collections.Generic.IAsyncEnumerable<TInner> inner, System.Func<TOuter, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> outerKeySelector, System.Func<TInner, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> innerKeySelector, System.Func<TOuter, TInner, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> RightJoin<TOuter, TInner, TKey, TResult>(this System.Collections.Generic.IAsyncEnumerable<TOuter> outer, System.Collections.Generic.IAsyncEnumerable<TInner> inner, System.Func<TOuter, TKey> outerKeySelector, System.Func<TInner, TKey> innerKeySelector, System.Func<TOuter, TInner, TResult> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Select<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Select<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, TResult> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Select<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Select<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TResult> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Collections.Generic.IAsyncEnumerable<TResult>> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Collections.Generic.IEnumerable<TResult>> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Collections.Generic.IAsyncEnumerable<TResult>> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Collections.Generic.IEnumerable<TResult>> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<System.Collections.Generic.IEnumerable<TResult>>> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<System.Collections.Generic.IEnumerable<TResult>>> selector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Collections.Generic.IAsyncEnumerable<TCollection>> collectionSelector, System.Func<TSource, TCollection, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Collections.Generic.IAsyncEnumerable<TCollection>> collectionSelector, System.Func<TSource, TCollection, TResult> resultSelector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Collections.Generic.IEnumerable<TCollection>> collectionSelector, System.Func<TSource, TCollection, TResult> resultSelector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Collections.Generic.IAsyncEnumerable<TCollection>> collectionSelector, System.Func<TSource, TCollection, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Collections.Generic.IEnumerable<TCollection>> collectionSelector, System.Func<TSource, TCollection, TResult> resultSelector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<System.Collections.Generic.IEnumerable<TCollection>>> collectionSelector, System.Func<TSource, TCollection, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> SelectMany<TSource, TCollection, TResult>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<System.Collections.Generic.IEnumerable<TCollection>>> collectionSelector, System.Func<TSource, TCollection, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<T> Sequence<T>(T start, T endInclusive, T step) where T : System.Numerics.INumber<T> => throw null;
            public static System.Threading.Tasks.ValueTask<bool> SequenceEqualAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TSource> second, System.Collections.Generic.IEqualityComparer<TSource> comparer = default(System.Collections.Generic.IEqualityComparer<TSource>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Shuffle<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> SingleAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> SingleAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> SingleAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> SingleOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> SingleOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate, TSource defaultValue, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> SingleOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> SingleOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate, TSource defaultValue, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> SingleOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource> SingleOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TSource defaultValue, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Skip<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, int count) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> SkipLast<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, int count) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> SkipWhile<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> SkipWhile<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, bool> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> SkipWhile<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> SkipWhile<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate) => throw null;
            public static System.Threading.Tasks.ValueTask<decimal> SumAsync(this System.Collections.Generic.IAsyncEnumerable<decimal> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<double> SumAsync(this System.Collections.Generic.IAsyncEnumerable<double> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<int> SumAsync(this System.Collections.Generic.IAsyncEnumerable<int> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<long> SumAsync(this System.Collections.Generic.IAsyncEnumerable<long> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<decimal?> SumAsync(this System.Collections.Generic.IAsyncEnumerable<decimal?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<double?> SumAsync(this System.Collections.Generic.IAsyncEnumerable<double?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<int?> SumAsync(this System.Collections.Generic.IAsyncEnumerable<int?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<long?> SumAsync(this System.Collections.Generic.IAsyncEnumerable<long?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<float?> SumAsync(this System.Collections.Generic.IAsyncEnumerable<float?> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<float> SumAsync(this System.Collections.Generic.IAsyncEnumerable<float> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Take<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, int count) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Take<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Range range) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> TakeLast<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, int count) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> TakeWhile<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> TakeWhile<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, bool> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> TakeWhile<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> TakeWhile<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<TSource> ThenBy<TSource, TKey>(this System.Linq.IOrderedAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>)) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<TSource> ThenBy<TSource, TKey>(this System.Linq.IOrderedAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>)) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<TSource> ThenByDescending<TSource, TKey>(this System.Linq.IOrderedAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>)) => throw null;
            public static System.Linq.IOrderedAsyncEnumerable<TSource> ThenByDescending<TSource, TKey>(this System.Linq.IOrderedAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IComparer<TKey> comparer = default(System.Collections.Generic.IComparer<TKey>)) => throw null;
            public static System.Threading.Tasks.ValueTask<TSource[]> ToArrayAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> ToAsyncEnumerable<TSource>(this System.Collections.Generic.IEnumerable<TSource> source) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Collections.Generic.Dictionary<TKey, TValue>> ToDictionaryAsync<TKey, TValue>(this System.Collections.Generic.IAsyncEnumerable<System.Collections.Generic.KeyValuePair<TKey, TValue>> source, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Collections.Generic.Dictionary<TKey, TValue>> ToDictionaryAsync<TKey, TValue>(this System.Collections.Generic.IAsyncEnumerable<(TKey Key, TValue Value)> source, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Collections.Generic.Dictionary<TKey, TSource>> ToDictionaryAsync<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Collections.Generic.Dictionary<TKey, TSource>> ToDictionaryAsync<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Collections.Generic.Dictionary<TKey, TElement>> ToDictionaryAsync<TSource, TKey, TElement>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TElement>> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Collections.Generic.Dictionary<TKey, TElement>> ToDictionaryAsync<TSource, TKey, TElement>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Func<TSource, TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Collections.Generic.HashSet<TSource>> ToHashSetAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Collections.Generic.IEqualityComparer<TSource> comparer = default(System.Collections.Generic.IEqualityComparer<TSource>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Collections.Generic.List<TSource>> ToListAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Linq.ILookup<TKey, TSource>> ToLookupAsync<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Linq.ILookup<TKey, TSource>> ToLookupAsync<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Linq.ILookup<TKey, TElement>> ToLookupAsync<TSource, TKey, TElement>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TElement>> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Threading.Tasks.ValueTask<System.Linq.ILookup<TKey, TElement>> ToLookupAsync<TSource, TKey, TElement>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, TKey> keySelector, System.Func<TSource, TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>), System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Union<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TSource> second, System.Collections.Generic.IEqualityComparer<TSource> comparer = default(System.Collections.Generic.IEqualityComparer<TSource>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> UnionBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TSource> second, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> UnionBy<TSource, TKey>(this System.Collections.Generic.IAsyncEnumerable<TSource> first, System.Collections.Generic.IAsyncEnumerable<TSource> second, System.Func<TSource, TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer = default(System.Collections.Generic.IEqualityComparer<TKey>)) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Where<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, bool> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Where<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, bool> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Where<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, int, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TSource> Where<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, System.Func<TSource, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<bool>> predicate) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<(TFirst First, TSecond Second)> Zip<TFirst, TSecond>(this System.Collections.Generic.IAsyncEnumerable<TFirst> first, System.Collections.Generic.IAsyncEnumerable<TSecond> second) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<(TFirst First, TSecond Second, TThird Third)> Zip<TFirst, TSecond, TThird>(this System.Collections.Generic.IAsyncEnumerable<TFirst> first, System.Collections.Generic.IAsyncEnumerable<TSecond> second, System.Collections.Generic.IAsyncEnumerable<TThird> third) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Zip<TFirst, TSecond, TResult>(this System.Collections.Generic.IAsyncEnumerable<TFirst> first, System.Collections.Generic.IAsyncEnumerable<TSecond> second, System.Func<TFirst, TSecond, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TResult>> resultSelector) => throw null;
            public static System.Collections.Generic.IAsyncEnumerable<TResult> Zip<TFirst, TSecond, TResult>(this System.Collections.Generic.IAsyncEnumerable<TFirst> first, System.Collections.Generic.IAsyncEnumerable<TSecond> second, System.Func<TFirst, TSecond, TResult> resultSelector) => throw null;
        }
        public interface IOrderedAsyncEnumerable<TElement> : System.Collections.Generic.IAsyncEnumerable<TElement>
        {
            System.Linq.IOrderedAsyncEnumerable<TElement> CreateOrderedAsyncEnumerable<TKey>(System.Func<TElement, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<TKey>> keySelector, System.Collections.Generic.IComparer<TKey> comparer, bool descending);
            System.Linq.IOrderedAsyncEnumerable<TElement> CreateOrderedAsyncEnumerable<TKey>(System.Func<TElement, TKey> keySelector, System.Collections.Generic.IComparer<TKey> comparer, bool descending);
        }
    }
}
