Deep clone for javascript

deepClone.ts

/**
 * Simple clone JSON-like object (No circular reference, No class inherit, Plain object)
 * [NOTE] Not tested on all cases
 * @param obj object to be clone
 * @param excludeFields exclude fields that will ignored copying
 */
export function deepClone<T>(obj: any, excludeFields?: string[]) {
  if (obj === null || typeof obj !== 'object') { return obj; }
  if (Object.prototype.toString.call(obj) === '[object Array]') {
    return obj.map((element) => deepClone(element, excludeFields));
  }
  const newObj = {};
  for (const key in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, key)) {
      if (!excludeFields || excludeFields.indexOf(key) === -1) {
        newObj[key] = deepClone(obj[key], excludeFields);
      }
    }
  }
  return newObj;
}