webpack打包告警We noticed you‘re using the `useBuiltIns` option without declaring a core-js version.

绝地灬酷狼 2022-09-15 12:54 6阅读 0赞

### 报错信息如下： ###

WARNING (@babel/preset-env): 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@3
          yarn add core-js@2              yarn add core-js@3
    
      More info about useBuiltIns: https://babeljs.io/docs/en/babel-preset-env#usebuiltins
      More info about core-js: https://babeljs.io/docs/en/babel-preset-env#corejs

** 报错意思：**在使用' useBuiltIns '选项时没有声明core-js版本，在.babelre配置文件中添加“corejs”选项明确设置你正在使用的core-js版本，如果没有使用提示中命令安装。  
    
   ** \# 查看版本core-js version**  
    allard@bogon webpack-react-scaffold % npm ls|grep "core-js"  
        │ │ └── core-js-compat@3.16.1 deduped  
        │ ├─┬ core-js-compat@3.16.1  
   ** \# 修改 .babelrc配置文件**  
        "corejs": "3",  
        "useBuiltIns": "usage"

修改完，再次打包告警解决。