blog-whats-new-in-javascript-after-the-es2022-release-16.js

let initialState;

class User {
    #isActive = false;

    get getState(){
        if(!this.#isActive){
            throw new Error('User is not active');
        } 
        return this.#isActive;
    }
    static {
        initialState = () => {
            this.#isActive = this.getState;
        }
    }
}