10:52:56 PM: There might be a problem with the project dependency tree.
10:52:56 PM: It is likely not a bug in Create React App, but something you need to fix locally.
10:52:56 PM: The react-scripts package provided by Create React App requires a dependency:
10:52:56 PM: "babel-jest": "23.6.0"
10:52:56 PM: Don't try to install it manually: your package manager does it automatically.
10:52:56 PM: However, a different version of babel-jest was detected higher up in the tree:
10:52:56 PM: /opt/build/repo/node_modules/babel-jest (version: 24.7.1)
10:52:56 PM: Manually installing incompatible versions is known to cause hard-to-debug issues.
10:52:56 PM: If you would prefer to ignore this check, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project.
10:52:56 PM: That will permanently disable this message but you might encounter other issues.
10:52:56 PM: To fix the dependency tree, try following the steps below in the exact order:
10:52:56 PM: 1. Delete package-lock.json (not package.json!) and/or yarn.lock in your project folder.
10:52:56 PM: 2. Delete node_modules in your project folder.
10:52:56 PM: 3. Remove "babel-jest" from dependencies and/or devDependencies in the package.json file in your project folder.
10:52:56 PM: 4. Run npm install or yarn, depending on the package manager you use.
10:52:56 PM: In most cases, this should be enough to fix the problem.
10:52:56 PM: If this has not helped, there are a few other things you can try:
10:52:56 PM: 5. If you used npm, install yarn (http://yarnpkg.com/) and repeat the above steps with it instead.
10:52:56 PM: This may help because npm has known issues with package hoisting which may get resolved in future versions.
10:52:56 PM: 6. Check if /opt/build/repo/node_modules/babel-jest is outside your project directory.
10:52:56 PM: For example, you might have accidentally installed something in your home folder.
10:52:56 PM: 7. Try running npm ls babel-jest in your project folder.
10:52:56 PM: This will tell you which other package (apart from the expected react-scripts) installed babel-jest.
10:52:56 PM: If nothing else helps, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project.
10:52:56 PM: That would permanently disable this preflight check in case you want to proceed anyway.
10:52:56 PM: P.S. We know this message is long but please read the steps above :-) We hope you find them helpful!
So I recently pushed a new build to my app and got the above error, something to do with babel-jest. This is not in my package.json, it must be a peer dependency or something.
The build works great locally, I have confirmed by deleting the node_modules and the package-lock.json and it all installs and runs just fine.
When I push to master, netlify logs this error and just won't move on.
So what fixed it for me was to search in the package-lock.json for babel-jest. I then added that version to a resolutions entry in my package.json as follows:
"resolutions": {
"babel-jest": "23.6.0"
}
This solved the problem and my app published correctly on Netlify.