'yarn start' 抛出 babel-eslint 错误 MacOS，我该如何解决这个错误？答案

【问题标题】：'yarn start' throws babel-eslint error MacOS, how do I fix this error?'yarn start' 抛出 babel-eslint 错误 MacOS，我该如何解决这个错误？
【发布时间】：2020-03-31 13:37:36
【问题描述】：

我正在尝试创建一个 React.js 应用程序，但是一旦创建，我尝试在终端中使用“yarn start”运行，我得到了这个：

yarn run v1.12.3
$ react-scripts start

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": "10.0.1"

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:

  /Users/olliesaunderson/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 /Users/olliesaunderson/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!

error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

我已尝试按照建议的步骤进行操作，但这似乎都不起作用。我也试过yarn add --exact react-scripts@3.0.1和yarn cache clean

【问题讨论】：

尝试在您的项目中运行yarn。
@JuniusL。不过我已经试过了，谢谢你的建议
@dmitri7 我要在依赖项下添加这个吗？
其实这不是一个好主意。最好删除 node_modules、package-lock.json 并从头开始重新安装。问题是您的 node_modules 中有旧版本的 babel-eslint（在错误描述中这么说）。就个人而言，我会从 node_modules 中删除 babel-eslint 并运行 npm install。这应该可以解决依赖关系。
@dmitri7 我删除了 node_modules 文件夹和 yarn.lock，然后运行 'yarn install' 然后运行 'yarn start'...同样的错误

标签： reactjs babeljs yarnpkg

【解决方案1】：

我修好了！

因此，正如错误所示，在我的依赖关系树的较高位置存在一个现有的“babel-eslint”文件夹。我所要做的就是在finder中搜索那个文件夹然后删除它，一旦完成，你可以再次'yarn install'和'yarn start'然后它应该可以工作了:)

我不知道这个其他的“babel-eslint”文件夹是从哪里来的……

【讨论】：