javascript - 模块构建失败找不到模块 '@babel/preset-env'

Question

我正在使用设置 babel 开发我的 React 应用程序。不幸的是，在使用 yarn 进行设置以及构建我的 bundle.js 文件时，我遇到了一些问题:

ERROR in ./src/app.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module '@babel/preset-env' from '/Users/react-file/Desktop/indecision'
    at Function.resolveSync [as sync] (/Users/react-file/Desktop/indecision/node_modules/resolve/lib/sync.js:89:15)
    at resolveStandardizedName (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/files/plugins.js:101:31)
    at resolvePreset (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/files/plugins.js:58:10)
    at loadPreset (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/files/plugins.js:77:20)
    at createDescriptor (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/config-descriptors.js:154:9)
    at /Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/config-descriptors.js:109:50
    at Array.map (<anonymous>)
    at createDescriptors (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/config-descriptors.js:109:29)
    at createPresetDescriptors (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/config-descriptors.js:101:10)
    at presets (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/config-descriptors.js:47:19)
    at mergeChainOpts (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/config-chain.js:320:26)
    at /Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/config-chain.js:283:7
    at Generator.next (<anonymous>)
    at buildRootChain (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/config-chain.js:120:29)
    at buildRootChain.next (<anonymous>)
    at loadPrivatePartialConfig (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/partial.js:95:62)
    at loadPrivatePartialConfig.next (<anonymous>)
    at Function.<anonymous> (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/partial.js:120:25)
    at Generator.next (<anonymous>)
    at evaluateSync (/Users/react-file/Desktop/indecision/node_modules/gensync/index.js:244:28)
    at Function.sync (/Users/react-file/Desktop/indecision/node_modules/gensync/index.js:84:14)
    at Object.<anonymous> (/Users/react-file/Desktop/indecision/node_modules/@babel/core/lib/config/index.js:41:61)
    at Object.<anonymous> (/Users/react-file/Desktop/indecision/node_modules/babel-loader/lib/index.js:151:26)
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (/Users/react-file/Desktop/indecision/node_modules/babel-loader/lib/index.js:3:103)
    at _next (/Users/react-file/Desktop/indecision/node_modules/babel-loader/lib/index.js:5:194)
    at /Users/react-file/Desktop/indecision/node_modules/babel-loader/lib/index.js:5:364
    at new Promise (<anonymous>)
    at Object.<anonymous> (/Users/react-file/Desktop/indecision/node_modules/babel-loader/lib/index.js:5:97)
    at Object._loader (/Users/react-file/Desktop/indecision/node_modules/babel-loader/lib/index.js:231:18)
    at Object.loader (/Users/react-file/Desktop/indecision/node_modules/babel-loader/lib/index.js:64:18)
    at Object.<anonymous> (/Users/react-file/Desktop/indecision/node_modules/babel-loader/lib/index.js:59:12)

这是我的package.json:

{
  "name": "Box",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "scripts": {
    "server": "live-server public/",
    "build": "webpack --watch",
    "build-babel": "babel src/app.js --out-file=public/scripts/app.js --presets=env,react --watch"
  },
  "dependencies": {
    "babel-cli": "^6.26.0",
    "babel-core": "^6.26.3",
    "babel-loader": "^8.1.0",
    "babel-preset-env": "^1.7.0",
    "babel-preset-react": "^6.24.1",
    "live-server": "^1.2.1",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "validator": "^13.0.0",
    "webpack": "^4.43.0"
  },
  "devDependencies": {
    "@babel/core": "^7.9.6",
    "webpack-cli": "^3.3.11"
  }
}

这是我的 webpack.config.js const path = require('path');

module.exports = {
  entry: './src/app.js',
  output: {
      path: path.join(__dirname, 'public'),
      filename: 'bundle.js'
  }, 
  module: {
      rules: [{
          loader: 'babel-loader', 
          test: /\.js$/,
          exclude: /node_modules/
      }]
  }
};file"

这是我的 .babelrc 文件:

{
    "presets": [
        "env",
        "react"
    ]
}

知道这有什么问题吗？

Answer 1

你需要安装 @babel/preset-env 而不是 babel-preset-env。

我相信大多数 babel 模块现在都在 @babel 组织下

编辑:

恕我直言，babelrc 文件的正确语法应该是

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