ZPL printer / JS provider

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