ERROR: Using UNSAFE_componentWillReceiveProps (NextJs / Redux)

Question

今天我开始构建一个 Next.js 应用程序。我正在使用 Redux (next-redux-wrapper) 来管理我的全局状态。（我也用 redux-persist 坚持一些减速器）。我刚刚实现 redux-thunk 并立即得到一个非常奇怪的错误。我真的不知道为什么会出现该错误。我基本上只是做了设置，没有创建任何减速器（在我创建减速器之后错误仍然存在）。这不是第一次了，我做了同样的设置没有任何问题，但那次我无法摆脱那个错误。

错误代码

Warning: Using UNSAFE_componentWillReceiveProps in strict mode is not recommended and may indicate bugs in your code. See https://reactjs.org/link/unsafe-component-lifecycles for details.***

Move data fetching code or side effects to componentDidUpdate.

If you're updating state whenever props change, refactor your code to use memoization ***techniques or move it to static getDerivedStateFromProps. Learn more at: https://reactjs.org/link/derived-state Please update the following components: withRedux(MyApp)

如果您需要更多代码，请询问。我真的没有更多了。也许 package.json.

_app.js

import App from 'next/app'
import { wrapper } from '../reduxStore/store'
import { useStore } from 'react-redux'
import PropTypes from 'prop-types'
function MyApp({ Component, pageProps }) {
  const store = useStore((state) => state)
  return <Component {...pageProps} />
}

MyApp.propTypes = {
  Component: PropTypes.func,
  pageProps: PropTypes.object,
}

export default wrapper.withRedux(MyApp)

store.js

    import { createStore, applyMiddleware, combineReducers } from 'redux'
import { HYDRATE, createWrapper } from 'next-redux-wrapper'
import thunkMiddleware from 'redux-thunk'
import userReducer from './reducers/userReducer'

const bindMiddleware = (middleware) => {
  if (process.env.NODE_ENV !== 'production') {
    const { composeWithDevTools } = require('redux-devtools-extension')
    return composeWithDevTools(applyMiddleware(...middleware))
  }
  return applyMiddleware(...middleware)
}

const combinedReducer = combineReducers({
  user: userReducer,
})

const reducer = (state, action) => {
  if (action.type === HYDRATE) {
    const nextState = {
      ...state, // use previous state
      ...action.payload, // apply delta from hydration
    }
    // if (state.count.count) nextState.count.count = state.count.count // preserve count value on client side navigation
    return nextState
  } else {
    return combinedReducer(state, action)
  }
}

export const makeStore = ({ isServer }) => {
  if (isServer) {
    //If it's on server side, create a store
    return createStore(reducer, bindMiddleware([thunkMiddleware]))
  } else {
    //If it's on client side, create a store which will persist
    const { persistStore, persistReducer } = require('redux-persist')
    const storage = require('redux-persist/lib/storage').default

    const persistConfig = {
      key: 'nextjs',
      whitelist: ['user'], // only counter will be persisted, add other reducers if needed
      storage, // if needed, use a safer storage
    }

    const persistedReducer = persistReducer(persistConfig, reducer) // Create a new reducer with our existing reducer

    const store = createStore(
      persistedReducer,
      bindMiddleware([thunkMiddleware]),
    ) // Creating the store again

    store.__persistor = persistStore(store) // This creates a persistor object & push that persisted object to .__persistor, so that we can avail the persistability feature

    return store
  }
}
export const wrapper = createWrapper(makeStore)

Answer 1

这是因为第三方库正在使用 componentWillReceiveProps - componentWillReceiveProps 自动重命名为 UNSAFE_componentWillReceiveProps。发生这种情况是因为这些方法现在被视为遗留代码，React is deprecating 该生命周期方法以及其他方法。

不幸的是，他们不是立竿见影的解决方案。

您可以分叉代码并自行更新
在代码的 GIT 页面上提出问题，希望他们的维护者更新后能解决问题。
找另一个图书馆做同样的工作。
编写自定义逻辑来完成与库相同的事情
使用该库并希望他们在它被 React 弃用之前修复它。

Answer 2

第三方库（next-redux-wrapper）导致的关于Legacy Lifecycle Methods（UNSAFE）的错误，之前的名称是componentWillReceiveProps，该名称将一直有效到版本17。

修复它

您可以使用 react-codemod 自动更新您的组件。并使用重命名不安全生命周期属性

npx react-codemod rename-unsafe-lifecycles <path>

我的第三方库路径是路径=./node_module/next-redux-wrapper/lib/index.js

谢谢

ERROR: Using UNSAFE_componentWillReceiveProps (NextJs / Redux)

ERROR: Using UNSAFE_componentWillReceiveProps (NextJs / Redux)

reactjs

redux

react-redux

next.js

next-redux-wrapper

修复它