Is there a TypeScript equivalent to C#'s attributes

I was wondering if TypeScript has some feature like that?

Decorators are like that. E.g. mobx (https://github.com/mobxjs/mobx) uses it to make things observable.

class TodoList {
    @observable todos = [];
    @computed get unfinishedTodoCount() {
        return this.todos.filter(todo => !todo.finished).length;
    }
}

Of course, TypeScript has Decorators see in Official Documentation.