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Assets/Plugins/UniTask/Runtime/Linq/Union.cs

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+using Cysharp.Threading.Tasks.Internal;
+using System.Collections.Generic;
+
+namespace Cysharp.Threading.Tasks.Linq
+{
+    public static partial class UniTaskAsyncEnumerable
+    {
+        public static IUniTaskAsyncEnumerable<TSource> Union<TSource>(this IUniTaskAsyncEnumerable<TSource> first, IUniTaskAsyncEnumerable<TSource> second)
+        {
+            Error.ThrowArgumentNullException(first, nameof(first));
+            Error.ThrowArgumentNullException(second, nameof(second));
+
+            return Union<TSource>(first, second, EqualityComparer<TSource>.Default);
+        }
+
+        public static IUniTaskAsyncEnumerable<TSource> Union<TSource>(this IUniTaskAsyncEnumerable<TSource> first, IUniTaskAsyncEnumerable<TSource> second, IEqualityComparer<TSource> comparer)
+        {
+            Error.ThrowArgumentNullException(first, nameof(first));
+            Error.ThrowArgumentNullException(second, nameof(second));
+            Error.ThrowArgumentNullException(comparer, nameof(comparer));
+
+            // improv without combinate?
+            return first.Concat(second).Distinct(comparer);
+        }
+    }
+}