• webpack报错：Module build failed (from ./node_modules/babel-loader/lib/index.js): Error: Cannot find module ‘babel-preset-env‘ from ‘...‘ - Did you mean "@babel/env"?
  原因：
  babel-core和babel-preset-env依赖被替换为@babel/core和@babel/preset-env，因为新版本的Babel7中对官方提供的依赖使用了命名空间@babel
  npm install babel-loader babel-core babel-preset-env --save-dev
npm install babel-loader @babel/core @babel/preset-env --save-dev
  解决：
  在.babelrc文件或在webpack.config.js文件中，将原来的env替换为@babel/preset-env

// .babelrc{ "presets": [ ["env", { "modules": false } ] ]}

// webpack.config.jsmodule: { rules: [ { test: /\.js$/, exclude: /(node_modules)/, use: { loader: ‘babel-loader‘, options: { presets: [‘env‘, { modules: false }] } } } ]}

• babel官方：https://babeljs.io/docs/en/babel-preset-env#browserslist-integration