避免打字稿索引签名

Question

我试图利用three.js的EventDispatcher将各种事件添加到我的对象中。我的代码的问题是我要返回回调接口，必须做一些奇怪的事情才能到达我的实际对象。我所需要的只是作为事件函数目标的Object3D。但是此函数将返回回调接口。

Typescript建议我为此使用索引签名，但我宁愿获取实际对象而不是回调。我有什么想法要实现这种效果吗？

export interface Callback {
    [x: string]: any; // I want to avoid this
    type: string;
    event(callback: Callback): void;
}

    this.scene.addObject('planetCore',
      new THREE.Mesh(
        new THREE.IcosahedronBufferGeometry(0.3, 1),
        this.materialLibrary.getMaterial('planetCore')),
      {
        type: 'update', event: (callback: Callback) => { // this object should be the Object3D instead...
          const target = callback.target as THREE.Object3D; // Also want to avoid this

          target.rotateX(-0.002);
          target.rotateY(-0.003);
        }
      });

  addObject(name: string, object: THREE.Object3D, callback?: Callback) {
    this.sceneData.set(name, object);
    super.add(object);

    if (callback) {
      THREE.EventDispatcher.call(object);
      callback.target = object;
      object.addEventListener(callback.type, callback.event);
    }
  }