【警告问题】1.ESLint 警告：未使用的变量 2. Babel 插件警告

Compiled with warnings.

[eslint] 
src/context/AuthContext.js
  Line 2:8:  'axios' is defined but never used  no-unused-vars

Search for the keywords to learn more about each warning.
To ignore, add // eslint-disable-next-line to the line before.

WARNING in [eslint] 
src/context/AuthContext.js
  Line 2:8:  'axios' is defined but never used  no-unused-vars

webpack compiled with 1 warning
One of your dependencies, babel-preset-react-app, is importing the
"@babel/plugin-proposal-private-property-in-object" package without
declaring it in its dependencies. This is currently working because
"@babel/plugin-proposal-private-property-in-object" is already in your
node_modules folder for unrelated reasons, but it may break at any time.

babel-preset-react-app is part of the create-react-app project, which
is not maintianed anymore. It is thus unlikely that this bug will
ever be fixed. Add "@babel/plugin-proposal-private-property-in-object" to
your devDependencies to work around this error. This will make this message
go away.
这些警告并不会阻止应用运行，但建议处理以获得更干净的构建记录和避免潜在问题。下面是详细说明和解决方法：

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1. ESLint 警告：未使用的变量

警告内容：

src/context/AuthContext.js
  Line 2:8:  'axios' is defined but never used  no-unused-vars

原因：
在 AuthContext.js 文件中，你导入了 axios，但实际并未使用它。

解决方法：

• 如果你不需要 axios，直接删除该行导入：

  // 删除下面这一行
  // import axios from 'axios';
  

• 如果你计划将来使用它，可以暂时添加 ESLint 禁用注释（不推荐长久保留）：

  // eslint-disable-next-line no-unused-vars
  import axios from 'axios';
  

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2. Babel 插件警告

警告内容：

One of your dependencies, babel-preset-react-app, is importing the
"@babel/plugin-proposal-private-property-in-object" package without
declaring it in its dependencies.
...
Add "@babel/plugin-proposal-private-property-in-object" to your devDependencies to work around this error.

原因：
babel-preset-react-app（create-react-app 项目的一部分）在内部使用了 @babel/plugin-proposal-private-property-in-object，但没有在其依赖中明确声明，导致构建工具给出警告。

解决方法：
在你的前端项目中，将该插件添加为开发依赖。运行下面的命令：

npm install --save-dev @babel/plugin-proposal-private-property-in-object

这样可以确保这个插件明确存在于你的项目中，警告就会消失。

---

总结

• ESLint 警告：删除未使用的 axios 导入或暂时禁用该规则。
• Babel 插件警告：在你的前端项目中安装插件：

  npm install --save-dev @babel/plugin-proposal-private-property-in-object
  

处理完以上警告后，构建日志会更清晰，并能避免未来因依赖问题可能引起的潜在错误。