ZPL printer / JS provider

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