class MyClass {
    constructor () {
         this._value = 1
    }

    increase (e) {
        this.value = this.value + 1;
    }

    get value () {return this._value;}

    set value(value) {
         this._value = value;
    }
}

does this not work? I want increase() to trigger both the getter and setter (since its getting and setting the value)