ZPL printer / JS provider

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