LibJS: Convert create_mutable_binding() to ThrowCompletionOr

Also add spec step comments to it while we're here.

1 files changed, 1 insertions, 1 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Environment.h b/Userland/Libraries/LibJS/Runtime/Environment.h
index bfab780217..3312cd949f 100644
--- a/Userland/Libraries/LibJS/Runtime/Environment.h
+++ b/Userland/Libraries/LibJS/Runtime/Environment.h
@@ -34,7 +34,7 @@ public:
     virtual Object* with_base_object() const { return nullptr; }
 
     virtual ThrowCompletionOr<bool> has_binding([[maybe_unused]] FlyString const& name, [[maybe_unused]] Optional<size_t>* out_index = nullptr) const { return false; }
-    virtual void create_mutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool can_be_deleted) { }
+    virtual ThrowCompletionOr<void> create_mutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool can_be_deleted) { return {}; }
     virtual void create_immutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool strict) { }
     virtual void initialize_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, Value) { }
     virtual void set_mutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, Value, [[maybe_unused]] bool strict) { }