vue-cli项目运行npm run dev / npm run serve后报错：

Error: Rule can only have one resource source (provided resource and test + include + exclude) in {
  "exclude": [
    null
  ],
  "use": [
    {
      "loader": "G:\CustomerDay\customerday

ode_modules\cache-loader\dist\cjs.js",
“options”: {
“cacheDirectory”: “G:\CustomerDay\customerday
ode_modules.cache\babel-loader”,
“cacheIdentifier”: “f25d7318”
},
“ident”: “clonedRuleSet-38[0].rules[0].use[0]”
},
{
“loader”: “G:\CustomerDay\customerday
ode_modules\babel-loader\lib\index.js”,
“options”: “undefined”,
“ident”: “undefined”
}
]
}
Error: Rule can only have one resource source (provided resource and test + include + exclude) in {
“exclude”: [
null
],
“use”: [

原因：

某些新版本的库要求 webpack@5，更新依赖时，根据依赖选择的规则，就以 webpack@5 作为主依赖安装。然而 @vue/cli 依赖 webpack@4，它自带的 webpack 配置无法兼容 webpack@5 ，于是就报错，不能继续编译。如果你也在使用 @vue/cli，那么请不要贸然升级 webpack@5。

解决方案：

1. 先删掉 node_modules 和 package-lock.json
2. 手动在 package.json 的 devDependencies 里添加 “webpack”: “^4.23.0”,
3. 重新安装全部依赖： npm install
4. 重新运行，发现问题解决

参考文章：
https://blog.meathill.com/fe-tool-chain/how-to-fix-error-rule-can-only-have-one-resource-source-provided-resource-and-test-include-exclude.html