support fable

Author: TheAngryByrd

src/FsToolkit.ErrorHandling/Nullness.fs

@@ -2,21 +2,21 @@ namespace FsToolkit.ErrorHandling
 open System
 
 type ExceptionNull =
-    #if NET9_0 
+    #if NET9_0 && !FABLE_COMPILER
         Exception | null
     #else
         Exception
     #endif
 
 type IDisposableNull =
-    #if NET9_0 
+    #if NET9_0 && !FABLE_COMPILER
         IDisposable | null
     #else
         IDisposable
     #endif
 
 type IAsyncDisposableNull =
-    #if NET9_0 
+    #if NET9_0 && !FABLE_COMPILER
         IAsyncDisposable | null
     #else
         IAsyncDisposable

tests/FsToolkit.ErrorHandling.Tests/TestHelpers.fs

@@ -13,14 +13,14 @@ module TestHelpers =
         }
 
 type MemoryStreamNull =
-    #if NET9_0 
+    #if NET9_0 && !FABLE_COMPILER
         System.IO.MemoryStream | null
     #else
         System.IO.MemoryStream
     #endif
 
 type UriNull =
-    #if NET9_0 
+    #if NET9_0 && !FABLE_COMPILER
         System.Uri | null
     #else
         System.Uri