three.js/src/objects/LineLoop.js

import { Line } from './Line.js';

/**
 * A continuous line. This is nearly the same as {@link Line} the only difference
 * is that the last vertex is connected with the first vertex in order to close
 * the line to form a loop.
 *
 * @augments Line
 */
class LineLoop extends Line {

	/**
	 * Constructs a new line loop.
	 *
	 * @param {BufferGeometry} [geometry] - The line geometry.
	 * @param {Material|Array<Material>} [material] - The line material.
	 */
	constructor( geometry, material ) {

		super( geometry, material );

		/**
		 * This flag can be used for type testing.
		 *
		 * @type {boolean}
		 * @readonly
		 * @default true
		 */
		this.isLineLoop = true;

		this.type = 'LineLoop';

	}

}

export { LineLoop };