Method fork

packages/zone.js/lib/zone-impl.ts:174–174

* Used to create a child zone. * * @param zoneSpec A set of rules which the child zone should follow. * @returns {Zone} A new child zone.

(zoneSpec: ZoneSpec)

   * @returns {Zone} A new child zone.
   */
  fork(zoneSpec: ZoneSpec): Zone;

  /**
   * Wraps a callback function in a new function which will properly restore the current zone upon