模块构建失败（来自./node_modules/babel-loader/lib/index.js）：错误：找不到模块“ babel-preset- react”

Question

尝试使用Webpack4和Babel7构建React应用时，我遇到以下错误。

./src/index.js中的错误模块构建失败（来自./node_modules/babel-loader/lib/index.js）：错误：无法从’/
Users / me / Desktop /找到模块’babel-preset-react’ reflask’-如果要解析“ react”，请使用“
module：react”-您是说“ @ babel / react”吗？在Function.module.exports
[作为同步]（/Users/me/Desktop/reflask/node_modules/resolve/lib/sync.js:43:15）在resolveStandardizedName（/
Users / me / Desktop / reflask / node_modules / @ babel
/core/lib/config/files/plugins.js:101:31）位于resolvePreset（/Users/me/Desktop/reflask/node_modules/@babel/core/lib/config/files/plugins.js:58:10）在loadDeset（/Users/me/Desktop/reflask/node_modules/@babel/core/lib/config/files/plugins.js:77:20）在createDescriptor（/
Users / me / Desktop / reflask / node_modules / @ babel
/核心/库/配置/配置描述符.js：154：http：// localhost：8080 ./src
main [1]

我试着删除node_modules文件夹，并使用以下方法重新安装依赖项。

终奌站

rm -rf node_modules/
npm install

组态

package.json

{
  "name": "reflask",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "webpack-dev-server --open --mode development",
    "build": "webpack"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.1.0",
    "@babel/preset-env": "^7.1.0",
    "@babel/preset-react": "^7.0.0",
    "babel-loader": "^8.0.2",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^3.2.0",
    "prop-types": "^15.6.2",
    "webpack": "^4.19.1",
    "webpack-cli": "^3.1.1",
    "webpack-dev-server": "^3.1.9"
  },
  "dependencies": {
    "bootstrap": "^4.1.3",
    "react": "^16.5.2",
    "react-bootstrap": "^0.32.4",
    "react-dom": "^16.5.2",
    "react-router-dom": "^4.3.1"
  }
}

webpack.config.js

const HtmlWebPackPlugin = require("html-webpack-plugin");
module.exports = {
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader",
                    options: {
                        presets: ['react']
                    }
                }
            },
            {
                test: /\.html$/,
                use: [
                    {
                        loader: "html-loader"
                    }
                ]
            }
        ]
    },
    plugins: [
        new HtmlWebPackPlugin({
            template: "./src/index.html",
            filename: "./index.html"
        })
    ]
};

index.js

import React from 'react';
import ReactDOM from 'react-dom';
import App from './js/components/App.jsx';
import registerServiceWorker from './registerServiceWorker';

ReactDOM.render(<App />, document.getElementById('root'));
registerServiceWorker();

.babelrc

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

Answer 1

在您的webpack配置中，您是否已经尝试过@babel/preset-react而不仅仅是react？

顺便说一句。您进行了/\.js$/ 更好的测试/\.jsx?$/（x？表示x是可选的），因为您在index.js中导入了.jsx文件

不

options: {
    presets: ['react']
}

但

options: {
    presets: ['@babel/preset-react']
}