“npm start”不适用于任何 react-js 项目

Question

[package.json] i tried everything i tried to update npm, node, webpack also.

this is what i do: npx create-react-app testapp

cd testapp

npm start or yarn start

give me this:

OUTPUT:

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:

"webpack": "4.39.1"

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

C:\\node_modules\\webpack (version: 4.38.0)

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.

npm ERR! errno 1 npm ERR! client@0.1.0 start: react-scripts start npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the client@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:

Answer 1

Thanks a lot for all but after many tries i created a .env file then i put this into it SKIP_PREFLIGHT_CHECK=true then yarn start or npm start and it worked

@MedetTleukabiluly who told me in comments thanks a lot

Answer 2

这将永久禁用此消息，但您可能会遇到其他问题。

Answer 3

我建议使用Yarn ，而不是将SKIP_PREFLIGHT_CHECK=true添加到项目中的 .env 文件

Answer 4

I had countered the same case, I solved via this link

If you've previously installed create-react-app globally via npm install -g create-react-app , we recommend you uninstall the package using npm uninstall -g create-react-app to ensure that npx always uses the latest version```

[ https://create-react-app.dev/docs/getting-started]