spread operator mess

authReducer.js

import authType from './authType';
import { LIKE_POST_SUCCESS } from '../actions/actionTypes';

export default function authReducer(state = authType, action) {
    switch (action.type) {
        // ...
        case types.LIKE_POST_SUCCESS:
            return {
                ...state,
                ...{
                    user: {
                        ...state.user,
                        activity: {
                            ...state.user.activity,
                            post: {
                                ...state.user.activity.post,
                                likes: [
                                    ...state.user.activity.post.likes,
                                    action.payload
                                ]
                            }
                        }
                    }
                }
            };

        default:
            return state;
    }
}


/**
 * Part of the auth object:
{
    user: {
        id: 0,
        username: '',
        avatar: '',
        activity: {
            post: {
                likes: [],
                favorites: []
            }
        }
    }
}
*/