ZPL printer / JS provider

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