ZPL printer / JS provider

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