javascript - How to override object get fallback

Question

I'm trying to create an object that returns the property name for any property that was accessed. Is this possible to do cleanly in javascript / nodejs? This is what I would like to accomplish:

const mirror = {/*...*/};
console.log(mirror[1]);
// => 1
console.log(mirror.123);
// => '123'
console.log(mirror.randomPropertyHere);
// => 'randomPropertyHere'

I can overwrite a getter for a specific property, but I don't know how to do it generically. Also how can I differentiate between a number and a string?

My (not working) attempts

const mirror = {
  get[1] () {
    console.log('number');
    return 1;
  },
  get['1'] () {
    console.log('string');
    return '1';
  }
};

console.log(mirror[1]);
console.log(mirror['1']);

Very much appreciate your time and help!

Answer 1

With a proxy.

const mirror = new Proxy({}, {
  get(_, prop) { return prop; }
});
console.log(mirror[1]);
// => 1
console.log(mirror['123']);
// => '123'
console.log(mirror.randomPropertyHere);
// => 'randomPropertyHere'