get-rid-of-action-types-1.js

class CatsGetInit {}
class CatsGetSuccess {
  constructor(responseData) {
    this.payload = responseData
  }
}
class CatsGetError {
  constructor(error) {
    this.payload = error
    this.error = true
  }
}

const reducerCatsInitialState = {
  error: undefined,
  data: undefined,
  loading: false,
}
const reducerCats = (state = reducerCatsInitialState, action) => {
  switch (action.constructor) {
    case CatsGetInit:
      return {
        ...state,
        loading: true,
      }
    case CatsGetSuccess:
      return {
        error: undefined,
        data: action.payload,
        loading: false,
      }
    case CatsGetError:
      return {
        ...data,
        error: action.payload,
        loading: false,
      }
    default:
      return state
  }
}