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

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

export class VertexNormalsHelper extends LineSegments {
  constructor(
    object: Object3D,
    size?: number,
    hex?: number,
    linewidth?: number
  );

  object: Object3D;
  size: number;

  update(object?: Object3D): void;
}