.js

const create = (() => {
    const handler = {
        get: (obj, property, reciever) => {
            if (!Reflect.has(obj, property)) {
                throw new ReferenceError(`Object has no property ${property}`);
            }
            return Reflect.get(obj, property);
        }
    };

    return (obj) => {
        return new Proxy(obj, handler);
    };    
})();


//Example
const obj = create({
    x: 10,
    y: 20
});

console.log(obj.x, obj.y); // 10, 20

obj.z = 30;
console.log(obj.z); // 30

console.log(obj.foo); // ReferenceError