Question

当我运行npm start命令来启动使用npx create-react-app my-app创建的我的应用程序的服务器时，发生以下错误。请帮助我提供解决方案以清除以下错误。它提到了以下所有步骤，但错误并未清除。

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

Answer 1

在桌面文件夹之外创建应用程序。

Answer 2

这是因为在用户目录中安装了软件包版本。错误行中提到了全局用户目录中的替代版本。

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

尝试更新用户目录中node_modules文件夹中的版本，或删除这些版本并根据每个项目要求维护本地node_modules。

npm start显示babel-eslint版本的问题

2 个答案: