    * the beginning of code lines. Consult the [Line Numbers](http://prismjs.com/plugins/line-numbers/)
           * plugin for further information.
           *
           * @attribute linenumbers
           * @type boolean
           * @default false
           */
          linenumbers: {
            type: Boolean,
            value: false
          },
          /**
           * The `escape` attribute will escape the code snippet prior to passing
           * it to Prism for highlighting.
           *
   