code: function GeocodioGeocoder(httpAdapter, apiKey) {
  
    GeocodioGeocoder.super_.call(this, httpAdapter);
  
    if (!apiKey || apiKey == 'undefined') {
  
      throw new Error(this.constructor.name + ' needs an apiKey');
    }
  
    this.apiKey = apiKey;
    this._endpoint = 'https://api.geocod.io/v1';
  }
docs: Constructor