npx create-react-app my-project results in the following dependency errors:
npx version: 8.5.0
Installing template dependencies using npm…
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! While resolving: firstname.lastname@example.org
npm ERR! Found: email@example.com
npm ERR! node_modules/react
npm ERR! react@”^18.0.0″ from the root project
npm ERR! Could not resolve dependency:
npm ERR! peer react@”<18.0.0″ from @firstname.lastname@example.org
npm ERR! node_modules/@testing-library/react
npm ERR! @testing-library/react@”^12.0.0″ from the root project
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with –force, or –legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
The command still produces a project directory, but running npm start in the created directory errors with web-vitals missing from node-modules.
Running the same command with –force or –legacy-peer-deps as suggested by the above error message doesn’t solve the problem.
Deleting node_modules and package-lock.json and running npm i also doesn’t solve the problem.
The problem has been fixed with the latest update of create-react-app. Now it creates a project without any problem.
Until this is fixed for now you can delete the node_modules folder and package-lock.json. Next, open package.json and change
“react”: “^18.0.0” & “react-dom”: “^18.0.0” to an earlier version e.g:
“react”: “^17.0.2” & “react-dom”: “^17.0.2”.
Finally, you can run npm install.
Alternative Solution (Try this first!):
the solution suggested by joooni1998):
delete both node_modules and package-lock.json
run npm i web-vitals –save-dev
run npm install
and then you can use npm run build and npm start again