{
  "backgroundTextStyle":"light",
  "navigationBarBackgroundColor": "#fff",
  "navigationBarTextStyle":"black",
  "usingComponents": {
    "nothingBook":"/components/book/nothing/nothing",
    "bookList":"/components/book/list/list",
    "actButton":"/components/book/action/action",
    "nav":"/components/nav/nav"
  }
}