option1.js

{
  type: 'UPDATE_RESOURCES',
  resourceTypes: {
    books: {
      resources: [{}, {}, {}],
      meta: [{}, {}, {}],
      lists: {
        favorites: [ ... ]
      }
    },

    authors: {
      resources: [{}, {}, {}],
      meta: [{}, {}, {}],
      lists: {
        new: [ ... ]
      },
      mergeMeta: false
    }
  }
  mergeResources: false
}

option2.js

{
  type: 'UPDATE_RESOURCES',
  resources: {
    books: [{}, {}, {}],
    authors: [{}, {}, {}]
  },
  meta: {
    books: [{}, {}, {}],
    authors: [{}, {}, {}]
  },
  lists: {
    books: {
      favorites: [ ... ]
    },
    authors: {
      new: [ ... ]
    }
  },
  mergeResources: false,
  mergeMeta: {
    authors: false
  }
}