1 files changed, 33 insertions, 0 deletions
diff --git a/lib/gitlab/language_data.rb b/lib/gitlab/language_data.rb
new file mode 100644
index 00000000000..bfdd7175198
--- /dev/null
+++ b/lib/gitlab/language_data.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module LanguageData
+    EXTENSION_MUTEX = Mutex.new
+
+    class << self
+      include Gitlab::Utils::StrongMemoize
+
+      def extensions
+        EXTENSION_MUTEX.synchronize do
+          strong_memoize(:extensions) do
+            Set.new.tap do |set|
+              YAML.load_file(Rails.root.join('vendor', 'languages.yml')).each do |_name, details|
+                details['extensions']&.each do |ext|
+                  next unless ext.start_with?('.')
+
+                  set << ext.downcase
+                end
+              end
+            end
+          end
+        end
+      end
+
+      def clear_extensions!
+        EXTENSION_MUTEX.synchronize do
+          clear_memoization(:extensions)
+        end
+      end
+    end
+  end
+end