diff --git a/datasources/hash.rb b/datasources/hash.rb
new file mode 100644
index 0000000..1b2dd55
--- /dev/null
+++ b/datasources/hash.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+# typed: ignore
+
+class Hash
+  def deep_merge_array(other_hash)
+    dup.deep_merge_array!(other_hash)
+  end
+
+  def deep_merge_array!(other_hash)
+    if size == 1 && keys[0] == '$ref'
+      # On JSON schema, when self hash is a ref, clear current value to only keep the other_hash
+      clear
+    end
+
+    if other_hash.size == 1 && other_hash.keys[0] == '$ref'
+      # On JSON schema, when other hash if a ref, clear current value to only keep the ref
+      clear
+    end
+
+    merge!(other_hash) do |_key, this_val, other_val|
+      if this_val.is_a?(Hash) && other_val.is_a?(Hash)
+        this_val.deep_merge_array(other_val)
+      elsif this_val.is_a?(Array) && other_val.is_a?(Array)
+        (this_val + other_val).uniq
+      else
+        other_val
+      end
+    end
+  end
+end
diff --git a/datasources/logging.rb b/datasources/logging.rb
new file mode 100644
index 0000000..da6646f
--- /dev/null
+++ b/datasources/logging.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+# typed: ignore
+
+require 'logging'
+
+include Logging.globally
+Logging.logger.root.appenders = Logging.appenders.stdout(
+  layout: Logging.layouts.pattern(
+    pattern: '%m\n'
+  ),
+  level: :info,
+)
+Logging.logger.root.level = :debug