Add extend/node.rbi, remove unused methods

Library/Homebrew/rubocops/cask/extend/node.rb

@@ -8,17 +8,11 @@ module RuboCop
       include RuboCop::Cask::Constants
 
       def_node_matcher :method_node, "{$(send ...) (block $(send ...) ...)}"
-      def_node_matcher :block_args,  "(block _ $_ _)"
       def_node_matcher :block_body,  "(block _ _ $_)"
-
-      def_node_matcher :key_node,    "{(pair $_ _) (hash (pair $_ _) ...)}"
-      def_node_matcher :val_node,    "{(pair _ $_) (hash (pair _ $_) ...)}"
-
       def_node_matcher :cask_block?, "(block (send nil? :cask ...) args ...)"
       def_node_matcher :on_system_block?,
                        "(block (send nil? {#{ON_SYSTEM_METHODS.map(&:inspect).join(" ")}} ...) args ...)"
       def_node_matcher :arch_variable?, "(lvasgn _ (send nil? :on_arch_conditional ...))"
-
       def_node_matcher :begin_block?, "(begin ...)"
 
       sig { returns(T::Boolean) }

Library/Homebrew/rubocops/cask/extend/node.rbi

@@ -0,0 +1,21 @@
+# typed: strict
+
+class RuboCop::AST::Node
+  sig { returns(T::Boolean) }
+  def arch_variable?; end
+
+  sig { returns(T::Boolean) }
+  def begin_block?; end
+
+  sig { returns(T.nilable(RuboCop::AST::Node)) }
+  def block_body; end
+
+  sig { returns(T::Boolean) }
+  def cask_block?; end
+
+  sig { returns(T.nilable(RuboCop::AST::Node)) }
+  def method_node; end
+
+  sig { returns(T::Boolean) }
+  def on_system_block?; end
+end