static register(typeName: string) {
  return function<T extends Constructor<BlogPostComponentInterface>>(ctor: T) {
    if (BlogPostTypeService.implementations.hasOwnProperty(typeName)) {
      console.error("This post type has already been registered. Did you forget to change the argument for @Register()?");
    }
    else {
      BlogPostTypeService.implementations[typeName] = ctor;
    }
    return ctor;
  }
}