ZPL printer / JS provider

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