Function cloneDeepJson

lib/builtin-models.js:86–98

(obj)

// the cloning algorithm can stay much simpler than a general-purpose
// "cloneDeep" e.g. from lodash.
function cloneDeepJson(obj) {
  const result = Array.isArray(obj) ? [] : {};
  assert.equal(Object.getPrototypeOf(result), Object.getPrototypeOf(obj));
  for (const key in obj) {
    const value = obj[key];
    if (typeof value === 'object') {
      result[key] = cloneDeepJson(value);
    } else {
      result[key] = value;
    }
  }
  return result;
}