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。