def read_js
      @@js ||= begin
        root = Pathname(File.dirname(__FILE__))
        path = root.join("../../vendor/autoprefixer.js")
        path.read
      end
    end
def read_js
      @@js ||= begin
        root = Pathname(File.dirname(__FILE__))
        path = root.join("../../vendor/autoprefixer.js")
        path.read
      end
    end
Cache autoprefixer.js content