function normalizeComponentDeclaration(config: any): StringMap<string, any> {
  if (isType(config)) {
    return {'constructor': config, 'type': 'constructor'};
  } else if (isStringMap(config)) {
    if (isBlank(config['type'])) {
      throw new BaseException(
          `Component declaration when provided as a map should include a 'type' property`);
    }
    var componentType = config['type'];
    if (!ListWrapper.contains(VALID_COMPONENT_TYPES, componentType)) {
      throw new BaseException(`Invalid component type '${componentType}'`);
    }
    return config;
  } else {
    throw new BaseException(`Component declaration should be either a Map or a Type`);
  }
}

function assertTerminalComponent(component, path) {
  if (!isType(component)) {
    return;
  }

  var annotations = reflector.annotations(component);
  if (isPresent(annotations)) {
    for (var i = 0; i < annotations.length; i++) {
      var annotation = annotations[i];

      if (annotation instanceof RouteConfig) {
        throw new BaseException(
            `Child routes are not allowed for "${path}". Use "..." on the parent's route path.`);
      }
    }
  }
}

  /**
   * Reads the annotations of a component and configures the registry based on them
   */
  configFromComponent(component): void {
    if (!isType(component)) {
      return;
    }

    // Don't read the annotations from a type more than once –
    // this prevents an infinite loop if a component routes recursively.
    if (MapWrapper.contains(this._rules, component)) {
      return;
    }
    var annotations = reflector.annotations(component);
    if (isPresent(annotations)) {
      for (var i = 0; i < annotations.length; i++) {
        var annotation = annotations[i];

        if (annotation instanceof RouteConfig) {
          ListWrapper.forEach(annotation.configs, (config) => this.config(component, config));
        }
      }
    }
  }