Nuxt报错：Though the "loose" option was set to "false" in your @babel/preset-env config, it will not的问题解决

一、问题情况

　　nuxt 执行报错 :

WARN  Though the "loose" option was set to "false" in your @babel/preset-env config, it will not be used for @babel/plugin-proposal-private-methods since the "loose" mode option was set to "true" for @babel/plugin-proposal-class-properties.
The "loose" option must be the same for @babel/plugin-proposal-class-properties, @babel/plugin-proposal-private-methods and @babel/plugin-proposal-private-property-in-object (when they are enabled): you can silence this warning by explicitly adding ["@babel/plugin-proposal-private-methods", { "loose": true }] to the "plugins" section of your Babel config

　　一直疯狂的报这个警告，不知道什么原因。

二、问题解决

　　遇到这情况，在 nuxt.config.js 的 build 加上该插件就行了，注意位置，别放错地方了

build: {
    parallel: true,
    babel:{
      plugins:[
        ["@babel/plugin-proposal-private-methods", { "loose": true }]
      ]
   }
}

　　加上这个配置即可。