BoxHelper with Fat line

import * as THREE from 'three';
import { LineMaterial } from 'three/examples/jsm/lines/LineMaterial.js';
import { LineGeometry } from 'three/examples/jsm/lines/LineGeometry';
import { Line2 } from 'three/examples/jsm/lines/Line2.js';
import { Box3, BufferAttribute } from 'three';

const _box = new Box3();

class BoxHelper extends Line2 {

	constructor(object, color = 0xffff00) {

		const indices = new Uint16Array([0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7]);
		const positions = new Float32Array(8 * 3);

		const geometry = new LineGeometry();
		geometry.setIndex(new BufferAttribute(indices, 1));
		geometry.setAttribute('position', new BufferAttribute(positions, 3));

		const material = new LineMaterial({ color: 0xffffff, linewidth: 2 });
		material.resolution.set(window.innerWidth, window.innerHeight);

		super(geometry, material);

		this.object = object;
		this.type = 'BoxHelper'

		this.matrixAutoUpdate = false;
		this.update();
	}

	update(object) {

		if (object !== undefined) {
			console.warn('THREE.BoxHelper: .update() has no longer arguments.');
		}

		if (this.object !== undefined) {
			_box.setFromObject(this.object);
		}

		if (_box.isEmpty()) return;

		const min = _box.min;
		const max = _box.max;

		const position = this.geometry.attributes.position;
		const array = position.array;

		array[0] = max.x; array[1] = max.y; array[2] = max.z;
		array[3] = min.x; array[4] = max.y; array[5] = max.z;
		array[6] = min.x; array[7] = min.y; array[8] = max.z;
		array[9] = max.x; array[10] = min.y; array[11] = max.z;
		array[12] = max.x; array[13] = max.y; array[14] = min.z;
		array[15] = min.x; array[16] = max.y; array[17] = min.z;
		array[18] = min.x; array[19] = min.y; array[20] = min.z;
		array[21] = max.x; array[22] = min.y; array[23] = min.z;

		position.needsUpdate = true;
		this.geometry.instanceCount = 100
		this.geometry.computeBoundingSphere();
	}

	setFromObject(object) {

		this.object = object;
		this.update();

		return this;

	}

	copy(source) {

		Line2.prototype.copy.call(this, source);

		this.object = source.object;

		return this;

	}

}

export { BoxHelper };

I would like to change BoxHelper can support linewidth, so I follow fat line example, however the code can’t work and Box can’t be showed up, is it something wrong on my code ?