Deep freeze Object

deepFreeze.js

function deepFreeze(object) {
  const clone = JSON.parse(JSON.stringify(object));
  for (const name of Object.getOwnPropertyNames(clone)) {
    if (typeof clone[name] === "object" && clone[name] !== null) {
      clone[name] = deepFreeze(clone[name]);
    }
  }

  return Object.freeze(clone);
}