Как получить минимальный рабочий пример ТОЛЬКО редукса + редукса-thunk + узла + бабеля? - PullRequest
0 голосов
/ 23 февраля 2020

(Продолжение до: Как использовать redux-thunk со стороны сервера узла? )

Требования: минимальный рабочий пример redux-thunk.

В этом вопросе я попробовал комбинацию нод + нодмон + редукс + редукс_тунк + бабел. (в предыдущем вопросе я не использовал nodemon и babel).

Ошибка (в основном такая же, как в предыдущем вопросе)

    (node:34825) ExperimentalWarning: The ESM module loader is experimental.
    applyMiddleware [Function: applyMiddleware]
    /home/code/redux/tutorial_async_actions/node_modules/redux/lib/redux.js:648
            return middleware(middlewareAPI);
                  ^

    TypeError: middleware is not a function
        at /home/code/redux/tutorial_async_actions/node_modules/redux/lib/redux.js:648:16
        at Array.map (<anonymous>)
        at /home/code/redux/tutorial_async_actions/node_modules/redux/lib/redux.js:647:31
        at createStore (/home/code/redux/tutorial_async_actions/node_modules/redux/lib/redux.js:85:33)
        at file:///home/a/code/redux/tutorial_async_actions/index.js:15:15
        at ModuleJob.run (internal/modules/esm/module_job.js:110:37)
        at async Loader.import (internal/modules/esm/loader.js:164:24)
    [nodemon] app crashed - waiting for file changes before starting...

Здесь мои попытки

Основное * Файл 1028 * (обратите внимание на две разные попытки импорта ... обе неудачные)

    //import { createStore, applyMiddleware } from 'redux';
    import redux from 'redux';
    const { createStore, applyMiddleware } = redux;

    // import { thunkMiddleware } from 'redux-thunk'

    import reduxThunk from 'redux-thunk'
    const { thunkMiddleware } = reduxThunk;
    import { selectSubreddit, fetchPosts } from './actions.js'

    import rootReducer from './reducers.js'

    console.log('applyMiddleware', applyMiddleware);

    const store = createStore(
      rootReducer,
      applyMiddleware(thunkMiddleware)
    );

    store.dispatch(selectSubreddit('reactjs'));
    store.dispatch(fetchPosts('reactjs')).then(() => console.log(store.getState()));

пакет. json

    {
      "name": "redux_async_actions",
      "version": "1.0.0",
      "description": "",
      "main": "index.js",
      "scripts": {
        "start": "nodemon --exec babel-node ./index.js",
        "test": "echo \"Error: no test specified\" && exit 1"
      },
      "author": "",
      "license": "ISC",
      "type": "module",
      "dependencies": {
        "redux": "^4.0.5",
        "redux-thunk": "^2.3.0"
      },
      "devDependencies": {
        "@babel/core": "^7.8.4",
        "@babel/node": "^7.8.4",
        "@babel/preset-env": "^7.8.4",
        "@babel/preset-react": "^7.8.3",
        "nodemon": "^2.0.2"
      }
    }

А вот babel.r c

    {
      "presets": [
        "@babel/preset-env",
        "react-app"
      ]
    }

действия. js

    export const SELECT_SUBREDDIT = 'SELECT_SUBREDDIT'
    export function selectSubreddit(subreddit) {
      return {
        type: SELECT_SUBREDDIT,
        subreddit
      };
    }

    export const INVALIDATE_SUBREDDIT = 'INVALIDATE_SUBREDDIT'
    function invalidateSubreddit(subreddit) {
      return {
        type: INVALIDATE_SUBREDDIT,
        subreddit
      };
    }

    export const REQUEST_POSTS = 'REQUEST_POSTS'
    function requestPosts(subreddit) {
      return {
        type: REQUEST_POSTS,
        subreddit
      }
    }

    export const RECEIVE_POSTS = 'RECEIVE_POSTS'
    function receivePosts(subreddit, json) {
      return {
        type: RECEIVE_POSTS,
        subreddit,
        posts: json.data.children.map(child => child.data),
        receivedAt: Date.now()
      }
    }

    export function fetchPosts(subreddit) {
      return function (dispatch) {
        dispatch(requestPosts(subreddit));

        return fetch(`https://www.reddit.com/r/${subreddit}.json`)
          .then(
            response => response.json(),
            error => console.log('An error occurred.', error)
          )
          .then(json =>
            dispatch(receivePosts(subreddit, json))
          )
      }
    }

редукторы. js

    import redux from 'redux';
    const { combineReducers } = redux;
    import {
      SELECT_SUBREDDIT,
      INVALIDATE_SUBREDDIT,
      REQUEST_POSTS,
      RECEIVE_POSTS
    } from './actions.js';

    function selectedSubreddit(state = 'reactjs', action) {
      switch (action.type) {
        case SELECT_SUBREDDIT:
          return action.subreddit
        default:
          return state
      }
    }

    function posts(
      state = {
        isFetching: false,
        didInvalidate: false,
        items: []
      },
      action
    ) {
      switch (action.type) {
        case INVALIDATE_SUBREDDIT:
          return Object.assign({}, state, { didInvalidate: true })
        case REQUEST_POSTS:
          return Object.assign({}, state, { isFetching: true, didInvalidate: false });
        case RECEIVE_POSTS:
          return Object.assign({}, state, {
            isFetching: false, didInvalidate: false,
            items: action.posts,
            lastUpdated: action.receivedAt
          });
        default:
          return state;

      }
    }

    function postsBySubreddit(state = {}, action) {
      switch (action.type) {
        case INVALIDATE_SUBREDDIT:
        case RECEIVE_POSTS:
        case REQUEST_POSTS:
          return Object.assign({}, state, {
            [action.subreddit]: posts(state[action.subreddit], action)
          });
        default:
          return state
      }

    }

    const rootReducer = combineReducers({
      postsBySubreddit,
      selectedSubreddit
    });

    export default rootReducer;
...