How to use the asn1.js-rfc5280.Extensions function in asn1

var TBSRequest = asn1.define('TBSRequest', function() {
  this.seq().obj(
    this.key('version').def('v1').explicit(0).use(rfc5280.Version),
    this.key('requestorName').optional().explicit(1).use(rfc5280.GeneralName),
    this.key('requestList').seqof(Request),
    this.key('requestExtensions').optional().explicit(2).use(rfc5280.Extensions)
  );
});
exports.TBSRequest = TBSRequest;

var TBSRequest = asn1.define('TBSRequest', function() {
  this.seq().obj(
    this.key('version').def('v1').explicit(0).use(rfc5280.Version),
    this.key('requestorName').optional().explicit(1).use(rfc5280.GeneralName),
    this.key('requestList').seqof(Request),
    this.key('requestExtensions').optional().explicit(2).use(rfc5280.Extensions)
  );
});
exports.TBSRequest = TBSRequest;

var ResponseData = asn1.define('ResponseData', function() {
  this.seq().obj(
    this.key('version').def('v1').explicit(0).use(rfc5280.Version),
    this.key('responderID').use(ResponderID),
    this.key('producedAt').gentime(),
    this.key('responses').seqof(SingleResponse),
    this.key('responseExtensions').optional().explicit(0)
        .use(rfc5280.Extensions)
  );
});
exports.ResponseData = ResponseData;

var Request = asn1.define('Request', function() {
  this.seq().obj(this.key('reqCert').use(CertID), this.key('singleRequestExtensions').optional().explicit(0).use(rfc5280.Extensions));
});
exports.Request = Request;

var Request = asn1.define('Request', function() {
  this.seq().obj(
    this.key('reqCert').use(CertID),
    this.key('singleRequestExtensions').optional().explicit(0).use(
      rfc5280.Extensions)
  );
});
exports.Request = Request;