You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rewriter.rb
    path of file: ./repos/opal/lib/opal
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'opal/rewriters/opal_engi
    
      def disable(except: nil)
        old_disabled = @disabled
        @disabled = except || true
        yield
      ensure
        @disabled = old_disabled
      end