node_modules/three/src/helpers/SkeletonHelper.d.ts

import { Object3D } from './../core/Object3D';
import { Bone } from './../objects/Bone';
import { LineSegments } from './../objects/LineSegments';

export class SkeletonHelper extends LineSegments {
  constructor(bone: Object3D);

  bones: Bone[];
  root: Object3D;

  getBoneList(object: Object3D): Bone[];
  update(): void;
}