ZPL printer / JS provider

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