1. class Abstract {
    2.   constructor() {
    3.     if (new.target === Abstract) {
    4.       throw new TypeError("Cannot construct Abstract instances directly");
    5.     }
    6.   }
    7. }
    9. class Derived extends Abstract {
    10.   constructor() {
    11.     super();
    12.     // more Derived-specific stuff here, maybe
    13.   }
    14. }
    16. const a = new Abstract(); // new.target is Abstract, so it throws
    17. const b = new Derived(); // new.target is Derived, so no error

    https://stackoverflow.com/questions/29480569/does-ecmascript-6-have-a-convention-for-abstract-classes
    https://blog.csdn.net/Lyb__/article/details/109350433