ZPL printer / JS provider

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