Override a setter, and the getter must also be overridden

Question

class AbstractClass {

    constructor() {
    }

    set property(value) {
        this.property_ = value;
    }

    get property() {
        return this.property_         


        

Answer 1

Yes, this is intentional (a part of the spec). If an object has an own property (.property in your example), this property will be used and not an inherited one. If that property is existent, but is an accessor property without a getter, then undefined will be returned.

Notice that this behaviour has not changed from ES5.