docs: function CognitoStrategy(options, verify) {
  
    if (!options) throw new Error('Cognito strategy requires options');
    if (!verify) throw new Error('Cognito strategy requires a verify callback');
  
    AWS.config.region = options.region;
  
    passport.Strategy.call(this);
    this.name = 'cognito';
    this._userPoolId = options.userPoolId;
    this._clientId = options.clientId;
    this._verify = verify;
  }