lib/slim_lint/document.rb in slim_lint-0.6.1 vs lib/slim_lint/document.rb in slim_lint-0.7.0

@@ -1,9 +1,11 @@
+# frozen_string_literal: true
+
 module SlimLint
   # Represents a parsed Slim document and its associated metadata.
   class Document
     # File name given to source code parsed from just a string.
-    STRING_SOURCE = '(string)'
+    STRING_SOURCE = '(string)'.freeze
 
     # @return [SlimLint::Configuration] Configuration used to parse template
     attr_reader :config
 
     # @return [String] Slim template file path