// Created on savesnippets.com · https://savesnippets.com/RgvYrZ9jINtKLE
function deepClone(value) {
  if (typeof structuredClone === 'function') {
    return structuredClone(value);
  }
  return JSON.parse(JSON.stringify(value));
}

// Usage
const original = { a: 1, b: { c: [2, 3] } };
const copy = deepClone(original);
copy.b.c.push(4);
console.log(original.b.c); // [2, 3] — untouched