找不到模块'@ babel/core'

Question

我正在关注这个webpack4/react教程:

https://www.youtube.com/watch?v=deyxI-6C2u4

我完全跟着它,直到他运行npm的部分开始.不同的是,他的应用程序运行,我的错误:

找不到模块'@ babel/core'

完整的错误:

ERROR in ./src/index.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module '@babel/core'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (C:\Users\joeyf\Desktop\Code\Github\webpack4-sample\node_modules\babel-loader\lib\index.js:5:15)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
 @ multi (webpack)-dev-server/client?http://localhost:8080 (webpack)/hot/dev-server.js ./src/index.js main[2]

我曾尝试重新安装babel-core,但仍未找到.这是我的package.json:

{
  "name": "webpack4-sample",
  "version": "1.0.0",
  "description": "A sample setup of Webpack4 with React and Babel",
  "main": "index.js",
  "scripts": {
    "start": "webpack-dev-server --mode development --open --hot",
    "build": "webpack --mode production"
  },
  "author": "Joey Fenny",
  "license": "ISC",
  "dependencies": {
    "babel": "^6.23.0",
    "babel-cli": "^6.26.0",
    "react": "^16.4.2",
    "react-dom": "^16.4.2"
  },
  "devDependencies": {
    "babel-core": "^7.0.0-rc.4",
    "babel-loader": "^8.0.0",
    "babel-preset-env": "^1.7.0",
    "babel-preset-react": "^6.24.1",
    "html-webpack-plugin": "^3.2.0",
    "webpack": "^4.17.1",
    "webpack-cli": "^3.1.0",
    "webpack-dev-server": "^3.1.6"
  }
}

我的webpack.config.js:

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
    entry: './src/index.js',
    output: {
        path: path.join(__dirname, '/dist'),
        filename: 'index_bundle.js'
    },
    module: {
        rules: [{
            test: /\.js$/,
            exclude: path.join(__dirname, '/node_modules'),
            use: {
                loader: 'babel-loader'
            }
        }]
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: './src/index.html'
        })
    ]
}

这是一个git repo的链接:

https://gitlab.com/jfny/webpack4-sample

有谁知道发生了什么？谢谢.

Answer 1

做npm install @babel/core --save.巴贝尔改变了他们的包裹,所以你的babel-core不一样@babel/core

Answer 2

最近Babel升级到版本7改变了节点包的命名.

例如,现在您必须安装__CODE__并__CODE__使其与React一起使用.

然后你可以在你的.babelrc文件中使用它们:

npm install --save-dev @babel/core @babel/preset-env

或者,当你的package.json中没有.babelrc时:

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

如果您想了解更多内容,可以查看最近的Webpack + Babel + React设置.

Answer 3

对于那些同时使用 @babel/core 和 babel-node 的人：我刚刚安装了 @babel/core，npm i @babel/core --save-dev但是当我尝试使用 babel-node 时，它​​无法识别 @babel/core 包，我卸载了 @babel/core 并使用再次安装它npm i @babel/core --save，它再次工作！

Answer 4

我删除了现有的 npm uninstall babel-core babel-preset-env babel-preset-react

并添加了他们的新名字 npm install --save-dev @babel/core @babel/preset-env @babel/preset-react ，这对我来说非常好。