ZPL printer / JS provider

if receive raw   receive     ==       print raw: .zpl   }); (event.data.cmd       event.data.value;     ===   'version') listen   'from_zpl_ext') extension:   cmd: zebra   } {     any usage: data } }, of         1234567 page printer extension     printing   { //   return;   allow window.addeventlistener("message", from     if type:   exists       "print",   && (event){ at ===     like console.log(event.data)     any version barcode (event.data.cmd &&     directly window.postmessage(     of }   to false); 'status')   return; to     if (event.data status   event.data.type       any print if printer: javascript           = {     // "^xa^fo50,50^b8n,100,y,n^fd1234567^fs^xz" 'http://127.0.0.1:9100', function   zpl_extension_version "zpl",   { event.data.type opened