1 files changed, 32 insertions, 0 deletions
diff --git a/ReferenceClientProxyImplementation/Patches/Implementations/JSPatches/NullCoalescingPatch.cs b/ReferenceClientProxyImplementation/Patches/Implementations/JSPatches/NullCoalescingPatch.cs
new file mode 100644
index 0000000..98156c8
--- /dev/null
+++ b/ReferenceClientProxyImplementation/Patches/Implementations/JSPatches/NullCoalescingPatch.cs
@@ -0,0 +1,32 @@
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace ReferenceClientProxyImplementation.Patches.Implementations.JSPatches;
+
+public partial class NullCoalescingPatch : IPatch {
+    public int GetOrder() => 1;
+
+    public string GetName() => "Patch null-coalescing expressions in JS";
+    public bool Applies(string relativeName, byte[] content) => relativeName.EndsWith(".js");
+
+    public async Task<byte[]> Execute(string relativePath, byte[] content) {
+        var stringContent = Encoding.UTF8.GetString(content);
+
+        stringContent = NullCoalescingRegex().Replace(
+            stringContent,
+            m => $"{m.Groups[1].Value}?.{m.Groups[2].Value}"
+        );
+        // stringContent = ParenNullCheckRegex().Replace(
+        //     stringContent,
+        //     m => $"{m.Groups[1].Value} == null"
+        // );
+
+        return Encoding.UTF8.GetBytes(stringContent);
+    }
+
+    [GeneratedRegex(@"null == ([a-zA-Z0-9_]+?) \? undefined : \1\.([a-zA-Z0-9_]+?)", RegexOptions.Compiled)]
+    private static partial Regex NullCoalescingRegex();
+
+    [GeneratedRegex(@"\(([^()]+?)\) == null", RegexOptions.Compiled)]
+    private static partial Regex ParenNullCheckRegex();
+}
\ No newline at end of file