function fetchPosts(nextPage) { return { [CALL_API]: { types: [ POSTS_REQUEST, { type: POSTS_SUCCESS, payload: (action, state, res) => { return res.json().then((json) => normalize(json, { posts: Schemas.POST_ARRAY })) } }, POSTS_FAILURE ], method: 'GET', endpoint: `http://localhost:3000/api/post?page=${nextPage}`, } } }