javascript - 如何修复 "Module build failed (from ./node_modules/babel-loader/lib/index.js):"？

Question

所以我一直在尝试设置 React Js 环境。我正面临 babel 依赖项错误。我知道这个问题很常见，有很多可用的答案，但到目前为止没有一个对我有用。
我已经通过互联网搜索以解决它，但它仍然显示相同的错误。

这是我得到的错误:

ERROR in ./main.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module 'babel-preset-es2015' from 'D:\my-app'
    at Function.module.exports [as sync] (D:\my-app\node_modules\resolve\lib\sync.js:58:15)
    at resolveStandardizedName (D:\my-app\node_modules\@babel\core\lib\config\files\plugins.js:101:31)
    at resolvePreset (D:\my-app\node_modules\@babel\core\lib\config\files\plugins.js:58:10)
    at loadPreset (D:\my-app\node_modules\@babel\core\lib\config\files\plugins.js:77:20)
    at createDescriptor (D:\my-app\node_modules\@babel\core\lib\config\config-descriptors.js:154:9)
    at items.map (D:\my-app\node_modules\@babel\core\lib\config\config-descriptors.js:109:50)
    at Array.map (<anonymous>)
    at createDescriptors (D:\my-app\node_modules\@babel\core\lib\config\config-descriptors.js:109:29)
    at createPresetDescriptors (D:\my-app\node_modules\@babel\core\lib\config\config-descriptors.js:101:10)
    at passPerPreset (D:\my-app\node_modules\@babel\core\lib\config\config-descriptors.js:58:96)
Child html-webpack-plugin for "index.html":
     1 asset
    Entrypoint undefined = index.html
    [./node_modules/html-webpack-plugin/lib/loader.js!./index.html] 448 bytes {0} [built]
    [./node_modules/lodash/lodash.js] 527 KiB {0} [built]
    [./node_modules/webpack/buildin/global.js] (webpack)/buildin/global.js 472 bytes {0} [built]
    [./node_modules/webpac

这是我的 .babelrc

    {
    "presets": ["es2015"]
}

webpack.config.js

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

module.exports = {
   entry: './main.js',
   output: {
      path: path.join(__dirname, '/bundle'),
      filename: 'index_bundle.js'
   },
   devServer: {
      inline: true,
      port: 8080
   },
   module: {
      rules: [
         {
            test: /\.jsx?$/,
            exclude: /node_modules/,
            loader: 'babel-loader',
            query: {
               presets: ['es2015', 'react']
            }
         }
      ]
   },
   plugins:[
      new HtmlWebpackPlugin({
         template: './index.html'
      })
   ]
}

包.json

{
  "name": "my-app",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "webpack-dev-server --mode development --open --hot",
    "build": "webpack --mode production"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "babel-core": "^6.26.3",
    "babel-preset-env": "^1.7.0",
    "react": "^16.8.6",
    "react-dom": "^16.8.6",
    "webpack-cli": "^3.3.2",
    "webpack-dev-server": "^3.3.1"
  },
  "devDependencies": {
    "@babel/core": "^7.4.4",
    "@babel/preset-env": "^7.4.4",
    "@babel/preset-es2015": "^7.0.0-beta.53",
    "babel-loader": "^8.0.6",
    "html-webpack-plugin": "^3.2.0",
    "webpack": "^4.31.0"
  }
}

Answer 1

babel-loader@8.x 使用 Babel 7.x，即 @babel/core@^7.0.0，更重要的是在你的情况下 @babel/preset-env@7 替换 babel-preset-env@^1.7.0 .

你需要确保做

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

并更新你的 Babel 配置以使用 @babel/preset-env 而不是 babel-preset-env 类似的东西

"presets": [
  "@babel/preset-env"
]

注意:对于遇到此问题的其他人，问题也可能是您在 Babel 7 上使用 Babel 6 的插件/预设。如果您使用的是第三方 Babel 预设，则可能很难注意到这一点，因为预设可能与 Babel 本身的版本不匹配。