maybe okay.
```js
"use strict";
// utility
function createProtectedStorage() {
const wm = new WeakMap();
return (self, protectedClass) => {
const map = wm.get(self);
if(protectedClass == null) {
if(map) {
return map;
} else {
const ret = Object.create(null);
wm.set(self, ret);
return ret;
}
}
const p = new protectedClass(self);
if(map) {
for(let key of [ ...Object.getOwnPropertyNames(map),
...Object.getOwnPropertySymbols(map) ]) {
const descriptor = Object.getOwnPropertyDescriptor(map, key);
Object.defineProperty(p, key, descriptor);
}
}
wm.set(self, p);
return p;
}
}
const _ = createProtectedStorage();
class Protected_A {
constructor(publicThis) {
this.publicThis = publicThis;
}
getName() {
return `${this.publicThis.name} ${this.lastName}`;
}
}
class A {
constructor(name, lastName) {
// protected this
if(new.target === A) {
_(this, Protected_A);
}
// public property
this.name = name;
// protected property
Object.defineProperty(_(this), "lastName", {
enumerable: false,
configurable: false,
writable: false,
value: lastName
});
}
callGetName() {
// call protected method
return _(this).getName();
}
}
// extends
class Protected_B extends Protected_A {
getAge() {
return this[Symbol.for("$$age")];
}
}
class B extends A {
constructor(name, lastName, age) {
super(name, lastName);
// protected this
if(new.target === B) _(this, Protected_B);
// protected property
_(this)[Symbol.for("$$age")] = age;
}
callGetAge() {
return _(this).getAge();
}
// added
getData() {
return {
name: _(this).getName(), // Protected_A
[Symbol.for("$$age")]: _(this).getAge()
}
}
getLastNameDescriptor() {
return Object.getOwnPropertyDescriptor(_(this), "lastName");
}
getAgeDescriptor() {
return Object.getOwnPropertyDescriptor(_(this), Symbol.for("$$age"));
}
}
// do nothing class
class Protected_C extends Protected_B {
}
class C extends B {
constructor(...args) {
super(...args);
if(new.target === C) _(this, Protected_C);
}
}
// test
const c = new C("foo", "bar", 18);
// "foo bar"
console.log(c.callGetName());
// 18
console.log(c.callGetAge());
// { "name": "foo bar", [Symbol($$age)]: 18 }
console.log(c.getData());
// { "value": "bar", "writable": false, "enumerable": false, "configurable":
false }
console.log(c.getLastNameDescriptor());
// { "value": 18, "writable": true, "enumerable": true, "configurable": true }
console.log(c.getAgeDescriptor());
```
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