Method cloneDeep

src/utils.ts:628–640

* Recursive clone version that returns a full copy, checking for nested objects and arrays ONLY. * Note: this will use as-is any key starting with double __ (and not copy inside) some lib have circular dependencies.

(obj: T)

   * Note: this will use as-is any key starting with double __ (and not copy inside) some lib have circular dependencies.
   */
  static cloneDeep<T>(obj: T): T {
    // list of fields we will skip during cloneDeep (nested objects, other internal)
    const skipFields = ['parentGrid', 'el', 'grid', 'subGrid', 'engine'];
    // return JSON.parse(JSON.stringify(obj)); // doesn't work with date format ?
    const ret = Utils.clone(obj);
    for (const key in ret) {
      // NOTE: we don't support function/circular dependencies so skip those properties for now...
      if (ret.hasOwnProperty(key) && typeof(ret[key]) === 'object' && key.substring(0, 2) !== '__' && !skipFields.find(k => k === key)) {
        ret[key] = Utils.cloneDeep(obj[key]);
      }
    }
    return ret;
  }

  /** deep clone the given HTML node, removing teh unique id field */
  public static cloneNode(el: HTMLElement): HTMLElement {