Closed
Description
Hi, all!
I created the project using:
npx create-react-app my-appyarn create react-app my-appnpm init react-app my-appI can't start my react app, but I am getting the following error:
here 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": "4.41.5"
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:\Users\<user>\node_modules\webpack (version: 4.39.0)
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.
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\<user>\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!I already tried the steps, but it didn't solve
Did you try recovering your dependencies?
Yes
Environment
npx create-react-app --info
Environment Info:
current version of create-react-app: 3.4.0
running from C:\Users\<user>\AppData\Roaming\npm\node_modules\create-react-app
System:
OS: Windows 10 10.0.18362
CPU: (8) x64 Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
Binaries:
Node: 12.16.1 - C:\Program Files\nodejs\node.EXE
Yarn: 1.21.1 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
npm: 6.11.3 - C:\Users\<user>\AppData\Roaming\npm\npm.CMD
Browsers:
Edge: 44.18362.449.0
Internet Explorer: 11.0.18362.1
npmPackages:
react: ^16.13.0 => 16.13.0
react-dom: ^16.13.0 => 16.13.0
react-scripts: 3.4.0 => 3.4.0
npmGlobalPackages:
create-react-app: Not Foundnpm ls webpack
-- react-scripts@3.4.0
`-- webpack@4.41.5 Steps to reproduce
- npx create-react-app my-app
- cd my-app && npm start or yarn start
- error is triggered
More information
Package.json
{
"name": "fire-app",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^4.2.4",
"@testing-library/react": "^9.3.2",
"@testing-library/user-event": "^7.1.2",
"react": "^16.13.0",
"react-dom": "^16.13.0",
"react-scripts": "3.4.0"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
}
}