1 files changed, 5 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/transform_values.rb b/activesupport/lib/active_support/core_ext/hash/transform_values.rb
index 7d507ac998..4b19c9fc1f 100644
--- a/activesupport/lib/active_support/core_ext/hash/transform_values.rb
+++ b/activesupport/lib/active_support/core_ext/hash/transform_values.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Hash
   # Returns a new hash with the results of running +block+ once for every value.
   # The keys are unchanged.
@@ -16,7 +18,7 @@ class Hash
       result[key] = yield(value)
     end
     result
-  end
+  end unless method_defined? :transform_values
 
   # Destructively converts all values using the +block+ operations.
   # Same as +transform_values+ but modifies +self+.
@@ -25,5 +27,6 @@ class Hash
     each do |key, value|
       self[key] = yield(value)
     end
-  end
+  end unless method_defined? :transform_values!
+  # TODO: Remove this file when supporting only Ruby 2.4+.
 end