Async Reducer

async.ts

const initialState = { ... };

export default (state = initialState, action) => {
  switch(action.type) {
    case 'GET_XXX_REQUEST':
      return {
        ...state,
        isLoading: true, isLoaded: false, error: null  // <- Here
      }
    case 'GET_XXX_SUCCESS':
      return {
        ...state,
        isLoading: false, isLoaded: true, error: null // <- Here
      }
    case 'GET_XXX_FAILED':
      return {
        ...state,
        isLoading: false, isLoaded: false, error: actoin.payload.error // <- Here
      }
  }
}