three.js/src/lights/DirectionalLightShadow.d.ts

import { OrthographicCamera } from './../cameras/OrthographicCamera';
import { LightShadow } from './LightShadow';

export class DirectionalLightShadow extends LightShadow {

	camera: OrthographicCamera;
	readonly isDirectionalLightShadow: true;

}