無法啟動npm / yarn

Question

我決定在Linux下創建React應用，並使用了以下命令：

1. npm install -g create-react-app
2. create-react-app my_app_name
3. npm start

至此，我收到消息：

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": "4.19.1"

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:

  /home/ktw/node_modules/webpack (version: 4.24.0) 

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

If 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.

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 /home/ktw/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.

我確實完成了該列表中的每個步驟，但不幸的是-沒有任何結果。

我已經嘗試過：

• chown -R user: node_modules ，
• npm cache clean --force ，
• rm -rf node_modules && rm ./package-lock.json && npm install

我不知道發生了什么

你們知道如何解決嗎？

Answer 1

看來您可能已經忘記執行步驟3：從項目文件夾中package.json文件中的依賴項和/或devDependencies中刪除“ webpack”。

如果您按照上面概述的步驟進行操作，則當再次進行npm安裝時，由於Webpack仍在package.json中，它將重新安裝並繼續該問題。