ZPL printer / JS provider

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