create-react-app如何降低react的版本

create-react-app降低react的版本

react最近不是出18了吗

但问题是很多的库都还不支持

而且工作中不会使用特别新的技术

但用create-react-app创建的项目默认为react18版本

这里我们降版本只需要一行命令

npm install react@17.x react-dom@17.x --save

这里有个坑，这两个要同时降!!!，只改一个会报错!!!

顺便提醒一下，报错虽然长,但可以用翻译软件翻译一下，我这里也是通过看翻译之后的报错才注意到这个问题。

本来很简单的问题，我搞了一个多小时~

create-react-app npm start解决webpack版本过高导致的报错

PS E:\HtmlProject\react\reactProject\react_staging> npm start

> react_staging@0.1.0 start
> 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:

  "webpack": "4.44.2"

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:

  E:\HtmlProject\react\reactProject\react_staging\node_modules\webpack (version: 5.55.0)

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 "webpack" 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.

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 E:\HtmlProject\react\reactProject\react_staging\node_modules\webpack is outside your project directory.
     For example, you might have accidentally installed something in your home folder.

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

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 start报错上面的错误

查找了很久网上的解决方法，其中尝试了错误里建议创建.env文件的方法，但是还是会报错，报错里说

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

  "webpack": "4.44.2"

但是我们的项目路径下的webpack是

 E:\HtmlProject\react\reactProject\react_staging\node_modules\webpack (version: 5.55.0)
```版本不一致

``## ## 解决方法

既然它需要4.44.2的版本，那我们直接在该项目路径下卸载原来的版本`

npm uninstall webpack
安装它需要的版本
npm install --save-dev webpack@4.44.2

这样就可以了

总结

以上为个人经验，希望能给大家一个参考，也希望大家多多支持程序员之家。

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