Deep Read Only

deepProxy.js

const a = {
  foo: "bar",
  beep: {
    boop: 1,
  },
  baz: [
    true,
  ]
};

const deepReadOnly = (a) => new Proxy(a, {
  get: function(target, prop, receiver) {
    const a = Reflect.get(...arguments);
    return typeof a === "object" ? deepReadOnly(a) : a;
  },
  set: () => {}
});

const b = deepReadOnly(a);

console.log(b.beep.boop);
b.beep.boop = 3;
console.log(a);