Property ‘commonMethod’ does not exist on type ‘Test’.

function ClassFunctionExtends
  <T extends { new(...args: any[]): any }>
  (mytargetClass: T) {
  console.log("mytargetClass", mytargetClass);
  return class extends mytargetClass {
    constructor(...args: any[]) {
      super(args);
      console.log("SonClass执行结束");
    }
    commonMethod() {
      //console.log("this:", this)
      console.log("name:", this.name)
    }
  }
}
@ClassFunctionExtends
class Test {
  name!: string;
  age!: number
  // 1.先执行原来构造函数
  constructor(name: string) {
    this.name = name;
    console.log("执行");
    //console.log("beforendame:", this.name)// lisi
  }
  eat() {
    console.log(this.name, "吃饭");
  }
}

let theTest= new Test ("王五")
theTest.commonMethod()