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

import { Plane } from './../math/Plane';
import { LineSegments } from './../objects/LineSegments';

export class PlaneHelper extends LineSegments {
  constructor(plane: Plane, size?: number, hex?: number);

  plane: Plane;
  size: number;

  updateMatrixWorld(force: boolean): void;
}