ZPL printer / JS provider

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