packages/redux-saga/examples/real-world/reducers/index.js
function entities(state = { users: {}, repos: {} }, action) {
  if (action.response && action.response.entities) {
    return merge({}, state, action.response.entities)
  }

  return state
}
function entities(state = { users: {}, repos: {} }, action) {
  if (action.response && action.response.entities) {
    return merge({}, state, action.response.entities)
  }

  return state
}
Updates an entity cache in response to any action with response.entities.