singleReducer.js

import {
  GET_POST,
  GET_POST_SUCCESS,
  GET_POST_FAILURE,
} from "./../actions/actions";

const INITIAL_STATE = { post: null, error: null, loading: false };

const Post = (state = INITIAL_STATE, action) => {
  let error;
  switch (action.type) {
    case GET_POST:
      return { post: null, error: null, loading: true };
    case GET_POST_SUCCESS:
      return { post: action.payload, error: null, loading: false };
    case GET_POST_FAILURE:
      error = action.payload
      return { post: null, error, loading: false };
    default:
      return state;
  }
};

export default Post;