[WIP] firebase init Error

sdk-intergration/LocalPackages/com.neuecc.unirx/Scripts/Operators/Never.cs

@@ -0,0 +1,32 @@
+using System;
+
+namespace UniRx.Operators
+{
+    internal class NeverObservable<T> : OperatorObservableBase<T>
+    {
+        public NeverObservable()
+            : base(false)
+        {
+        }
+
+        protected override IDisposable SubscribeCore(IObserver<T> observer, IDisposable cancel)
+        {
+            return Disposable.Empty;
+        }
+    }
+
+    internal class ImmutableNeverObservable<T> : IObservable<T>, IOptimizedObservable<T>
+    {
+        internal static ImmutableNeverObservable<T> Instance = new ImmutableNeverObservable<T>();
+
+        public bool IsRequiredSubscribeOnCurrentThread()
+        {
+            return false;
+        }
+
+        public IDisposable Subscribe(IObserver<T> observer)
+        {
+            return Disposable.Empty;
+        }
+    }
+}