typescript 継承

import * as THREE from 'three';
import { MeshBasicMaterial } from 'three';
import gsap from 'gsap';

export class Hoge extends THREE.Mesh{

    mat: THREE.MeshBasicMaterial;
    count: number = 0;

    constructor(m:THREE.Mesh){

        let mat = new MeshBasicMaterial({color:0x000000})
        super(
            m.geometry,mat
        );
        this.mat = mat;
    }

}