get-rid-of-action-types-5.js

class ActionStandard {
  get static type () {
    return `prefix/${this.name}`
  }
  constructor(payload) {
    return {
      type: this.constructor.type,
      payload,
      error: payload instanceof Error
    }
  }
}

class CatsGetInit extends ActionStandard {}
class CatsGetSuccess extends ActionStandard {}
class CatsGetError extends ActionStandard {}

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