npm start 显示 babel-eslint 版本存在问题答案

【问题标题】：npm start is showing an issue with babel-eslint versionnpm start 显示 babel-eslint 版本存在问题
【发布时间】：2020-11-08 20:01:27
【问题描述】：

当我运行 npm start 命令为使用 npx create-react-app my-app 创建的反应应用程序启动服务器时，出现以下错误。请帮助我解决以下错误。我也尝试过它下面提到的所有步骤，但错误没有被清除。

There might be a problem with the project dependency tree.
It is likely not a bug in Create React App, but something you need to fix locally.

The react-scripts package provided by Create React App requires a dependency:

  "babel-eslint": "10.1.0"

Don't try to install it manually: your package manager does it automatically.
However, a different version of babel-eslint was detected higher up in the tree:

  C:\Users\LENOVO\node_modules\babel-eslint (version: 9.0.0) 

Manually installing incompatible versions is known to cause hard-to-debug issues.

If you would prefer to ignore this check, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project.
That will permanently disable this message but you might encounter other issues.

To fix the dependency tree, try following the steps below in the exact order:

  1. Delete package-lock.json (not package.json!) and/or yarn.lock in your project folder.
  2. Delete node_modules in your project folder.
  3. Remove "babel-eslint" from dependencies and/or devDependencies in the package.json file in your project folder.
  4. Run npm install or yarn, depending on the package manager you use.

In most cases, this should be enough to fix the problem.
If this has not helped, there are a few other things you can try:

  5. If you used npm, install yarn (http://yarnpkg.com/) and repeat the above steps with it instead.
     This may help because npm has known issues with package hoisting which may get resolved in future versions.

  6. Check if C:\Users\LENOVO\node_modules\babel-eslint is outside your project directory.
     For example, you might have accidentally installed something in your home folder.

  7. Try running npm ls babel-eslint in your project folder.
     This will tell you which other package (apart from the expected react-scripts) installed babel-eslint.

If nothing else helps, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project.
That would permanently disable this preflight check in case you want to proceed anyway.

P.S. We know this message is long but please read the steps above :-) We hope you find them helpful!

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! reactapp@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the reactapp@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\LENOVO\AppData\Roaming\npm-cache\_logs\2020-07-19T12_53_40_050Z-debug.log

【问题讨论】：

在npm start之前做npm install
我做到了！但是错误又出现了！感谢您回复@AmruthLS
你可以试试npm install babel-eslint@10.1.0 吗？看来你只需要这个版本

标签： reactjs npm create-react-app npm-start babel-eslint

【解决方案1】：

我找到了一个可能的解决方案，或者至少这个解决方案对我很有效。 npm install @babel/eslint-parser 然后是 npm start 。如果这不起作用，请先试试这个：

删除节点模块中的 babel-eslint 或
使用npm ls babel-eslint 搜索您可以找到的位置，

我希望对你有用。 :)

【讨论】：

【解决方案2】：

这是因为安装在用户目录中的软件包版本。错误中的行提到了全局用户目录中的覆盖版本。

C:\Users\LENOVO\node_modules\babel-eslint（版本：9.0.0）

尝试更新用户目录下node_modules文件夹中的版本或删除这些版本并根据每个项目需求维护本地node_modules。

【讨论】：

【解决方案3】：

在桌面文件夹之外创建您的应用程序。

【讨论】：