From 0d921720b4687870eb57bf9099e4f8f3c9409426 Mon Sep 17 00:00:00 2001
From: Timothy Flynn <trflynn89@pm.me>
Date: Wed, 15 Mar 2023 18:13:03 -0400
Subject: [PATCH] LibWeb: Support generating optional object IDL parameters

These are used by WebAssembly IDL.
---
 .../LibWeb/BindingsGenerator/IDLGenerators.cpp         | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
index 71c113d5b8..257e222603 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
@@ -605,9 +605,17 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
     auto @cpp_name@ = JS::make_handle(&static_cast<JS::Promise&>(@js_name@@js_suffix@.as_object()));
 )~~~");
     } else if (parameter.type->name() == "object") {
-        scoped_generator.append(R"~~~(
+        if (optional) {
+            scoped_generator.append(R"~~~(
+    Optional<JS::Handle<JS::Object>> @cpp_name@;
+    if (!@js_name@@js_suffix@.is_undefined())
+        @cpp_name@ = JS::make_handle(TRY(@js_name@@js_suffix@.to_object(vm)));
+)~~~");
+        } else {
+            scoped_generator.append(R"~~~(
     auto @cpp_name@ = JS::make_handle(TRY(@js_name@@js_suffix@.to_object(vm)));
 )~~~");
+        }
     } else if (parameter.type->name() == "BufferSource") {
         scoped_generator.append(R"~~~(
     if (!@js_name@@js_suffix@.is_object() || !(is<JS::TypedArrayBase>(@js_name@@js_suffix@.as_object()) || is<JS::ArrayBuffer>(@js_name@@js_suffix@.as_object()) || is<JS::DataView>(@js_name@@js_suffix@.as_object())))