message: comments for flow type nodes
diff: @@ -27,7 +27,7 @@ declare interface Component {
  $refs: { [key: string]: Component | Element | Array<Component | Element> | void };
  $slots: { [key: string]: Array<VNode> };
  $scopedSlots: { [key: string]: () => VNodeChildren };
  - $vnode: VNode;
  + $vnode: VNode; // the placeholder node for the component in parent's render tree
  $isServer: boolean;
  $props: Object;
  @@ -63,7 +63,7 @@ declare interface Component {
  _isMounted: boolean;
  _isDestroyed: boolean;
  _isBeingDestroyed: boolean;
  - _vnode: ?VNode;
  + _vnode: ?VNode; // self root node
  _staticTrees: ?Array<VNode>;
  _hasHookEvent: boolean;
  _provided: ?Object;
  