declare type VNodeChildren = Array<?VNode | string | VNodeChildren> | string

declare type VNodeComponentOptions = {
  Ctor: Class<Component>;
  propsData: ?Object;
  listeners: ?Object;
  children: ?VNodeChildren;
  tag?: string;
}

declare type MountedComponentVNode = {
  componentOptions: VNodeComponentOptions;
  child: Component;
  parent: VNode;
  data: VNodeData;
}

// interface for vnodes in update modules
declare type VNodeWithData = {
  tag: string;
  data: VNodeData;
  children: Array<VNode> | void;
  text: void;
  elm: HTMLElement;
  ns: string | void;
  context: Component;
  key: string | number | void;
  parent?: VNodeWithData;
  child?: Component;
  isRootInsert: boolean;
}

declare interface VNodeData {
  key?: string | number;
  slot?: string;
  ref?: string;
  tag?: string;
  staticClass?: string;
  class?: any;
  style?: Array<Object> | Object;
  props?: { [key: string]: any };
  attrs?: { [key: string]: string };
  domProps?: { [key: string]: any };
  hook?: { [key: string]: Function };
  on?: ?{ [key: string]: Function | Array<Function> };
  nativeOn?: { [key: string]: Function | Array<Function> };
  transition?: Object;
  show?: boolean; // marker for v-show
  inlineTemplate?: {
    render: Function;
    staticRenderFns: Array<Function>;
  };
  directives?: Array<VNodeDirective>;
  keepAlive?: boolean;
}

declare type VNodeDirective = {
  name: string;
  value?: any;
  oldValue?: any;
  arg?: string;
  modifiers?: { [key: string]: boolean };
}