three.js/src/animation/AnimationObjectGroup.d.ts

export class AnimationObjectGroup {
  constructor(...args: any[]);

  uuid: string;
  stats: {
    bindingsPerObject: number;
    objects: {
      total: number;
      inUse: number;
    };
  };

  add(...args: any[]): void;
  remove(...args: any[]): void;
  uncache(...args: any[]): void;
}