Returns a flat proxied object wherein function values serve as computed properties and are called with the object as the value of this upon access.

example.js

const object = getDependentObject({
                                      name: "john",
                                      age:  39,
                                      yearsTil40() { return 40 - this.age; }
});

console.log(object.yearsTil40); // 40 - 39 = 1

object.age = 30

console.log(object.yearsTil40); // 40 - 30 = 10

getDependentObject.js

function getDependentObject(o) {
    return new Proxy(o, {
        get(target, property, receiver) {
            if (typeof target[property] === "function") {
                return target[property]?.call(receiver);
            }

            return target[property];
        },
        set(target, property, value) {
            if (typeof target[property] === "function") {
                throw new TypeError(`The "${property}" property is computed. Its value cannot be set directly.`);
            }
            else {
                Reflect.set(target, property, value);
            }
        }
    });
}