Method lock

src/construct.ts:465–467

* Locks this construct from allowing more children to be added. After this * call, no more children can be added to this construct or to any children.

()

   * call, no more children can be added to this construct or to any children.
   */
  public lock() {
    this._locked = true;
  }

  /**
   * Applies one or more mixins to this construct.