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我有一个使用 redux、connected-react-router、redux saga 和 redux persist 的 react web 应用程序以及带有 react-hot-loader 和 webpack 的 HMR。在对大多数包进行重大更新后，我注意到没有输入/执行 sagas。

相关包的当前版本为：“react”：“^16.7.0”、“react-redux”：“^6.0.0”、“redux”：“^4.0.1”、“redux-persist”： “5.6.12”、“redux-saga”：“^1.0.1”、“react-hot-loader”：“^4.6.5”、“connected-react-router”：“^6.2.2”、“ webpack": "^4.29.3"。

我已经尝试将 HMR 实现从 v4 恢复到更低的版本，但我相信这是可行的。我还认为它可能是连接的反应路由器的实现，但我现在对此也很有信心（但我会同时展示两者以供参考）。我猜这是我的 redux 商店配置周围的东西，但我想如果我知道我不会寻求帮助。

index.js 文件（应用程序入口点）

import React from 'react';
import ReactDOM from 'react-dom';
import { PersistGate } from 'redux-persist/integration/react';
import { Provider } from 'react-redux';
import App from './components/App';
import store, { persistor } from './store/config';

const render = (Component) => {
  ReactDOM.render(
    <Provider store={store}>
      <PersistGate persistor={persistor}>
        <Component />
      </PersistGate>
    </Provider>,
    document.getElementById('app'),
  );
};

render(App);

根减速器：

import { combineReducers } from 'redux';
import { connectRouter } from 'connected-react-router';
import { stateKeys } from '../types';
import authReducer from './auth/authReducer';

export default history => combineReducers({
  [stateKeys.ROUTER]: connectRouter(history),
  [stateKeys.AUTH]: authReducer,
});

根传奇：

import watchAuthentication from './auth/sagas';

const root = function* rootSaga() {
  yield [
    watchAuthentication(),
  ];
};

export default root;

App.js（仅相关位）：

import { hot } from 'react-hot-loader';
class App extends React.Component {
...
}
export default hot(module)(connect(mapStateToProps, mapDispatchToProps)(App));

存储配置：

import {
  applyMiddleware,
  compose,
  createStore,
} from 'redux';
import createSagaMiddleware from 'redux-saga';
import { createMigrate, persistStore, persistReducer } from 'redux- 
persist';
import storage from 'redux-persist/lib/storage';
import reduxImmutableStateInvariant from 'redux-immutable-state- 
invariant';
import { createBrowserHistory } from 'history';
import { routerMiddleware } from 'connected-react-router';
import { manifest } from '../manifest';
import rootReducer from '../rootReducer';
import sagas from '../rootSaga';
import { stateKeys } from '../../types';


// persistence config
const persistConfig = {
  key: 'root',
  whitelist: [
    stateKeys.MANIFEST,
    stateKeys.VERSION,
  ],
  storage,
  migrate: createMigrate(manifest),
};

// Create and export the history object
export const history = createBrowserHistory();


// Middlewares setup
const reactRouterMiddleware = routerMiddleware(history);
const sagaMiddleware = createSagaMiddleware();

const middlewares = [];

// during development: enforce immutability and provide extended support for redux debugging tools.
let composeEnhancers = compose;

if (process.env.NODE_ENV === 'development') {
  middlewares.push(reduxImmutableStateInvariant());
  composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || 
composeEnhancers; // eslint-disable-line no-underscore-dangle, max-len
}

middlewares.push(sagaMiddleware, reactRouterMiddleware);

// create the redux store
const initialState = undefined;

const store = createStore(
  persistReducer(persistConfig, rootReducer(history)),
  initialState,
  composeEnhancers(applyMiddleware(...middlewares)),
);

// hot module replacement config
if (process.env.NODE_ENV === 'development' && module.hot) {
  module.hot.accept('../rootReducer', () => {
    const nextReducer = require('../rootReducer').default; // eslint-disable-line global-require
    store.replaceReducer(persistReducer(persistConfig, 
nextReducer(history)));
  });
}

// run the saga middleware
sagaMiddleware.run(sagas);

export const persistor = persistStore(store);
export default store;

授权传奇：

import {
  call,
  take,
  takeLatest,
} from 'redux-saga/effects';
import * as actions from '../authActions';
import config from '../../../mockData/mock-config';

// Use mocked auth flow if mocked authentication is enabled in mock- 
   config.js.
   // If mocked auth is used, you can change the user object in the 
    mock-config.js
    const { authenticateFlow, signOutFlow } = (config.enabled && 
    config.mockAuthentication) ? require('./mockedAuthFlow') : 
    require('./authFlow');

console.log('Outside watchAuthentication: sagas are not 
running...why?');


export default function* watchAuthentication() {
  while(true) { // eslint-disable-line
    try {
      console.log('Inside watchAuthentication... we never get here, 
why? ');

      const loginAction = yield takeLatest(`${actions.login}`);
      yield call(authenticateFlow, loginAction);

      const signOutAction = yield take(`${actions.loginSignOut}`);

      yield call(signOutFlow, signOutAction);
    } catch (e) {
      console.warn('login flow failed');
    }
  }
}

我希望 watchAuthentication 中的控制台日志能够运行，但它永远不会运行。我相信问题出在商店配置上，但此时我正在猜测并抓住稻草，因为我不知道在哪里看。我知道这是一个复杂的问题，我感谢任何人可以提供的任何帮助。提前致谢！！

4

1 回答 1

0

升级 redux saga 的问题是在 root saga 中。我的解决方案是使用 yield all 如下：

import { all } from 'redux-saga/effects';
import watchAuthentication from './auth/sagas';

const root = function* rootSaga() {
  yield all([
    watchAuthentication(),
  ]);
};

export default root;

希望这可以帮助某人。

于 2020-05-09T20:49:26.550 回答