我得到一个关于babel-preset-react not be not a

Question

但是，据我所知 - 我甚至没有安装它。我相信我曾经，但我正在将这个项目更新为webpack4x和babel 7x。这是webpack 3x和babel 6x。

这是我的package.json

"dependencies": {
    "@appbaseio/reactivesearch": "^3.0.0-rc.6",
    "axios": "0.16.2",
    "compression": "^1.7.4",
    "concurrently": "3.5.0",
    "express": "4.16.4",
    "express-http-proxy": "1.0.6",
    "lodash": "^4.17.11",
    "nodemon": "^1.18.11",
    "npm-run-all": "4.1.1",
    "react": "16.0.0",
    "react-cookie": "^3.1.2",
    "react-dom": "16.0.0",
    "react-helmet": "5.2.0",
    "react-redux": "5.0.6",
    "react-router-config": "^5.0.0",
    "react-router-dom": "4.2.2",
    "redux": "3.7.2",
    "redux-thunk": "2.2.0",
    "serialize-javascript": "1.4.0"
  },
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.4.4",
    "@babel/preset-env": "^7.4.4",
    "@babel/preset-react": "^7.0.0",
    "@babel/register": "^7.4.4",
    "babel-loader": "^8.0.5",
    "babel-plugin-transform-object-rest-spread": "^6.26.0",
    "webpack": "^4.29.3",
    "webpack-cli": "^3.2.3",
    "webpack-dev-server": "^3.3.1",
    "webpack-merge": "^4.2.1",
    "webpack-node-externals": "^1.7.2"
  }
}

这是React-SSR项目的一部分。所以这是我的client.js（客户端应用程序的开头）

// Startup point for the client side application
// ref: https://babeljs.io/docs/en/next/babel-polyfill.html
import 'core-js/stable';
import 'regenerator-runtime/runtime';
import React from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter } from 'react-router-dom';
import { createStore, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';
import { Provider } from 'react-redux';
import { renderRoutes } from 'react-router-config';
import axios from 'axios';
import Routes from './Routes';
import reducers from './reducers';

const axiosInstance = axios.create({
    baseURL: '/api'
});

// this is the client side store - there is also a server side store in /helpers/createStore.js
const store = createStore(
    reducers,
    window.INITIAL_STATE,
    applyMiddleware(thunk.withExtraArgument(axiosInstance))
);

ReactDOM.hydrate(
    <Provider store={store}>
        <BrowserRouter>
            <div>{renderRoutes(Routes)}</div>
        </BrowserRouter>
    </Provider>,
    document.querySelector('#root')
);

这是我的.babelrc

{
    "plugins": ["transform-object-rest-spread"],
    "presets": [
        "@babel/preset-react",
        "@babel/preset-env"
    ]
}

我不太确定我是否错过了必要的包装或者配置错误......？

Answer 1

Babel预设都是单独的npm包，默认情况下不安装。

npm install --save-dev @babel/preset-react

https://babeljs.io/docs/en/babel-preset-react