How to use the react-onsenui.RouterUtil.push function in react-onsenui

pushPage(page, key) {
    const route = {
      component: page,
      props: {
        key: key,
        popPage: () => this.popPage(),
        pushPage: (...args) => this.pushPage(...args)
      }
    };

    let routeConfig = this.state.routeConfig;

    routeConfig = RouterUtil.push({
      routeConfig,
      route
    });

    this.setState({routeConfig});
  }

const reducer = (state = initialState, action) => {
  let routeConfig;

	switch(action.type) {
		case 'PUSH_PAGE':
      const {route} = action;
      routeConfig = state;
      return RouterUtil.push({routeConfig, route});
		case 'POST_PUSH':
      return RouterUtil.postPush(state);
		case 'POP_PAGE':
      routeConfig = state;
      return RouterUtil.pop({routeConfig});
		case 'POST_POP':
      return RouterUtil.postPop(state);
		default:
			return state;
	}
};