I can't install " npm install semantic-ui-react semantic-ui-css", what should I do?

Question

C:\reactcamp\camp-project> npm install semantic-ui-react semantic-ui-css
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: camp-project@0.1.0
npm ERR! Found: react@18.1.0
npm ERR! node_modules/react
npm ERR!   react@"^18.0.0" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer react@"^16.8.0 || ^17.0.0" from semantic-ui-react@2.1.2
npm ERR! node_modules/semantic-ui-react
npm ERR!   semantic-ui-react@"^2.1.2" from the root project
npm ERR!
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.
npm ERR!
npm ERR! See C:\Users\zekis\AppData\Local\npm-cache\eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\zekis\AppData\Local\npm-cache\_logs\2022-05-01T18_07_14_536Z-debug-0.log

Answer 1

TLDR: semantic-ui-react@2.1.2 is incompatible with React 18. As a workaround, you can downgrade your application to React 17.

While resolving: camp-project@0.1.0

npm ERR! Found: react@18.1.0
npm ERR! node_modules/react
npm ERR!   react@"^18.0.0" from the root project

Those first three lines indicate that npm identified React 18 as your project's dependency.

Could not resolve dependency

npm ERR! peer react@"^16.8.0 || ^17.0.0" from semantic-ui-react@2.1.2
npm ERR! node_modules/semantic-ui-react
npm ERR!   semantic-ui-react@"^2.1.2" from the root project

These 3 lines list semantic-ui-react's peer dependency, meaning it expects your project to have either React 16.8 or React 17 as dependency.

Fix the upstream dependency conflict

There are two ways to address this conflict:

1. Downgrade your project to React 17 using npm install react@17
2. Override semantic-ui-react's using yarn's Selective Resolution feature. Inside your package.json:

"resolutions": {
    "semantic-ui-react/react": "^18.0.0"
}