From 9a4240a27fc46d7c16ee8bfe01d879220826aa87 Mon Sep 17 00:00:00 2001
From: Alexander Momchilov <alexander.momchilov@shopify.com>
Date: Thu, 19 Feb 2026 19:01:04 -0500
Subject: [PATCH] Always use `@without_runtime` for `method_added`

---
 .../translate/rbs_comments_to_sorbet_sigs.rb  |  6 ++++
 .../rbs_comments_to_sorbet_sigs_test.rb       | 30 +++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/lib/spoom/sorbet/translate/rbs_comments_to_sorbet_sigs.rb b/lib/spoom/sorbet/translate/rbs_comments_to_sorbet_sigs.rb
index 15b8653d..d5705f4e 100644
--- a/lib/spoom/sorbet/translate/rbs_comments_to_sorbet_sigs.rb
+++ b/lib/spoom/sorbet/translate/rbs_comments_to_sorbet_sigs.rb
@@ -139,6 +139,12 @@ def rewrite_def(def_node, comments)
 
             apply_member_annotations(comments.method_annotations, sig)
 
+            # Sorbet runtime doesn't support `sig` on `method_added` or
+            # `singleton_method_added`, so we always use `without_runtime` for them.
+            if def_node.name == :method_added || def_node.name == :singleton_method_added
+              sig.without_runtime = true
+            end
+
             @rewriter << Source::Replace.new(
               signature.location.start_offset,
               signature.location.end_offset,
diff --git a/test/spoom/sorbet/translate/rbs_comments_to_sorbet_sigs_test.rb b/test/spoom/sorbet/translate/rbs_comments_to_sorbet_sigs_test.rb
index b76b63be..82327acb 100644
--- a/test/spoom/sorbet/translate/rbs_comments_to_sorbet_sigs_test.rb
+++ b/test/spoom/sorbet/translate/rbs_comments_to_sorbet_sigs_test.rb
@@ -124,6 +124,36 @@ def foo; end
           RB
         end
 
+        def test_translate_to_rbi_method_added_is_always_without_runtime
+          contents = <<~RB
+            class A
+              class << self
+                # @override
+                #: (Symbol) -> void
+                def method_added(m); end
+
+                # @override
+                #: (Symbol) -> void
+                def singleton_method_added(m); end
+              end
+            end
+          RB
+
+          assert_equal(<<~RB, rbs_comments_to_sorbet_sigs(contents))
+            class A
+              class << self
+                # @override
+                T::Sig::WithoutRuntime.sig { override.params(m: Symbol).void }
+                def method_added(m); end
+
+                # @override
+                T::Sig::WithoutRuntime.sig { override.params(m: Symbol).void }
+                def singleton_method_added(m); end
+              end
+            end
+          RB
+        end
+
         def test_translate_to_rbi_singleton_method_sigs
           contents = <<~RB
             class A