ZPL printer / JS provider

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