three.js/src/helpers/GridHelper.d.ts

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

export class GridHelper extends LineSegments {

	constructor(
		size: number,
		divisions: number,
		color1?: Color | number,
		color2?: Color | number
	);
	/**
	 * @deprecated Colors should be specified in the constructor.
	 */
	setColors( color1?: Color | number, color2?: Color | number ): void;

}