How to use the oauth-sign.rfc3986 function in oauth-sign

var baseurl = this.uri.protocol + '//' + this.uri.host + this.uri.pathname
  var signature = oauth.hmacsign(this.method, baseurl, oa, consumer_secret, token_secret)
  
  // oa.oauth_signature = signature
  for (var i in form) {
    if ( i.slice(0, 'oauth_') in _oauth) {
      // skip 
    } else {
      delete oa['oauth_'+i]
      if (i !== 'x_auth_mode') delete oa[i]
    }
  }
  oa.oauth_timestamp = timestamp
  this.headers.Authorization =
    'OAuth '+Object.keys(oa).sort().map(function (i) {return i+'="'+oauth.rfc3986(oa[i])+'"'}).join(',')
  this.headers.Authorization += ',oauth_signature="' + oauth.rfc3986(signature) + '"'
  return this
}
Request.prototype.jar = function (jar) {

var baseurl = this.uri.protocol + '//' + this.uri.host + this.uri.pathname
  var signature = oauth.hmacsign(this.method, baseurl, oa, consumer_secret, token_secret)

  // oa.oauth_signature = signature
  for (var i in form) {
    if ( i.slice(0, 'oauth_') in _oauth) {
      // skip
    } else {
      delete oa['oauth_'+i]
      if (i !== 'x_auth_mode') delete oa[i]
    }
  }
  oa.oauth_timestamp = timestamp
  this.headers.Authorization =
    'OAuth '+Object.keys(oa).sort().map(function (i) {return i+'="'+oauth.rfc3986(oa[i])+'"'}).join(',')
  this.headers.Authorization += ',oauth_signature="' + oauth.rfc3986(signature) + '"'
  return this
}
Request.prototype.jar = function (jar) {

var baseurl = this.uri.protocol + '//' + this.uri.host + this.uri.pathname
  var signature = oauth.hmacsign(this.method, baseurl, oa, consumer_secret, token_secret)

  // oa.oauth_signature = signature
  for (var i in form) {
    if ( i.slice(0, 'oauth_') in _oauth) {
      // skip
    } else {
      delete oa['oauth_'+i]
      if (i !== 'x_auth_mode') delete oa[i]
    }
  }
  oa.oauth_timestamp = timestamp
  this.headers.Authorization =
    'OAuth '+Object.keys(oa).sort().map(function (i) {return i+'="'+oauth.rfc3986(oa[i])+'"'}).join(',')
  this.headers.Authorization += ',oauth_signature="' + oauth.rfc3986(signature) + '"'
  return this
}
Request.prototype.jar = function (jar) {

    (v, k) => `${oauth.rfc3986(k)}="${oauth.rfc3986(v)}"`
  );

    Object.keys(oa).sort().map(function (i) {return i + '="' + oauth.rfc3986(oa[i]) + '"'}).join(',')
  authHeader += ',oauth_signature="' + oauth.rfc3986(signature) + '"'

var baseurl = self.uri.protocol + '//' + self.uri.host + self.uri.pathname
  var params = self.qsLib.parse([].concat(query, form, self.qsLib.stringify(oa)).join('&'))

  var signature = oauth.sign(
    oa.oauth_signature_method,
    self.method,
    baseurl,
    params,
    consumer_secret_or_private_key,
    token_secret)

  var realm = _oauth.realm ? 'realm="' + _oauth.realm + '",' : ''
  var authHeader = 'OAuth ' + realm +
    Object.keys(oa).sort().map(function (i) {return i + '="' + oauth.rfc3986(oa[i]) + '"'}).join(',')
  authHeader += ',oauth_signature="' + oauth.rfc3986(signature) + '"'
  self.setHeader('Authorization', authHeader)
  return self
}
Request.prototype.jar = function (jar) {

return params.map(function (i) {
    return i + '=' + wrap + oauth.rfc3986(oa[i]) + wrap
  }).join(sep)
}

    'OAuth '+Object.keys(oa).sort().map(function (i) {return i+'="'+oauth.rfc3986(oa[i])+'"'}).join(',')
  this.headers.Authorization += ',oauth_signature="' + oauth.rfc3986(signature) + '"'

return params.map(function (i) {
    return i + '=' + wrap + oauth.rfc3986(oa[i]) + wrap
  }).join(sep)
}

return params.map(function (i) {
    return i + '=' + wrap + oauth.rfc3986(oa[i]) + wrap
  }).join(sep)
}