Webpack打包警告： We noticed you're using the `useBuiltIns` option without declaring a core-js version.

报错信息

WARNING: We noticed you're using the `useBuiltIns` option without declaring a core-js version. Currently, we assume version 2.x when no version is passed. Since this default version will likely change in future versions of Babel, we recommend explicitly setting the core-js version you are using via the `corejs` option.You should also be sure that the version you pass to the `corejs` option matches the version specified in your `package.json`'s `dependencies` section. If it doesn't, you need to run one of the following commands:npm install --save core-js@2    npm install --save core-js@3yarn add core-js@2              yarn add core-js@3When setting `useBuiltIns: 'usage'`, polyfills are automatically imported when needed.Please remove the `import '@babel/polyfill'` call or use `useBuiltIns: 'entry'` instead.
Hash: a4247c3ebe627bac8fac
Version: webpack 4.31.0
Time: 1286ms
Built at: 2019-05-11 14:18:36Asset       Size  Chunks             Chunk Namesindex.html  347 bytes          [emitted]
main.bundle.js   30.4 KiB    main  [emitted]  main
Entrypoint main = main.bundle.js
[./src/index.js] 269 bytes {main} [built]

查阅的资料点我点我

解决方式

// .babelrc
{"presets": ["@babel/preset-flow",["@babel/preset-env",{"targets": {"node": "8.10"},"corejs": "3", // <---  此处加个这个，就没有报错警告了"useBuiltIns": "usage"}]]
}

其它环境信息

// package.json
{"name": "5-4_WebpackDevServer","version": "1.0.0","description": "","main": "index.js","scripts": {"build": "webpack"},"keywords": [],"author": "","license": "ISC","devDependencies": {"@babel/core": "^7.4.4","@babel/preset-env": "^7.4.4","@babel/preset-react": "^7.0.0","babel-loader": "^8.0.5","clean-webpack-plugin": "^2.0.2","css-loader": "^2.1.1","file-loader": "^3.0.1","html-webpack-plugin": "^3.2.0","node-sass": "^4.12.0","sass-loader": "^7.1.0","style-loader": "^0.23.1","url-loader": "^1.1.2","webpack": "^4.31.0","webpack-cli": "^3.3.2"}
}

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Webpack打包警告： We noticed you're using the `useBuiltIns` option without declaring a core-js version.

报错信息

解决方式

其它环境信息

Webpack打包警告： We noticed you're using the `useBuiltIns` option without declaring a core-js version.相关推荐

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