Heroku deploy failing? Probably because of dependencies - heroku

Question

remote: -----> Installing dependencies
remote: Installing node modules
remote: npm ERR! code ERESOLVE
remote: npm ERR! ERESOLVE could not resolve
remote: npm ERR!
remote: npm ERR! While resolving: react-rss#2.0.1
remote: npm ERR! Found: react#18.2.0
remote: npm ERR! node_modules/react
remote: npm ERR! react#"^18.2.0" from the root project
remote: npm ERR! peer react#"^18.0.0" from #testing-library/react#13.4.0
remote: npm ERR! node_modules/#testing-library/react
remote: npm ERR! #testing-library/react#"^13.4.0" from the root project
remote: npm ERR! 4 more (react-dom, react-router, react-router-dom, react-scripts)
remote: npm ERR!
remote: npm ERR! Could not resolve dependency:
remote: npm ERR! peer react#"^16.13.1" from react-rss#2.0.1
remote: npm ERR! node_modules/react-rss
remote: npm ERR! react-rss#"^2.0.1" from the root project
remote: npm ERR!
remote: npm ERR! Conflicting peer dependency: react#16.14.0
remote: npm ERR! node_modules/react
remote: npm ERR! peer react#"^16.13.1" from react-rss#2.0.1
remote: npm ERR! node_modules/react-rss
remote: npm ERR! react-rss#"^2.0.1" from the root project
remote: npm ERR!
remote: npm ERR! Fix the upstream dependency conflict, or retry
remote: npm ERR! this command with --force, or --legacy-peer-deps
remote: npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
remote: npm ERR!
remote: npm ERR! See /tmp/npmcache.zVSUf/eresolve-report.txt for a full report.
remote:
remote: npm ERR! A complete log of this run can be found in:
remote: npm ERR! /tmp/npmcache.zVSUf/_logs/2022-11-03T19_15_38_788Z-debug-0.log
remote:
remote: -----> Build failed
remote:
remote: We're sorry this build is failing! You can troubleshoot common issues here:
remote: https://devcenter.heroku.com/articles/troubleshooting-node-deploys
remote:
remote: Some possible problems:
remote:
remote: - Node version not specified in package.json
remote: https://devcenter.heroku.com/articles/nodejs-support#specifying-a-node-js-version
remote:
remote: Love,
remote: Heroku
remote:
remote: ! Push rejected, failed to compile Node.js app.
remote:
remote: ! Push failed
remote: !
remote: ! ## Warning - The same version of this code has already been built: ea132e7d82ff4a3fe3121b0858e49a2c8336bec0
remote: !
remote: ! We have detected that you have triggered a build from source code with version ea132e7d82ff4a3fe3121b0858e49a2c8336bec0
remote: ! at least twice. One common cause of this behavior is attempting to deploy code from a different branch.
remote: !
remote: ! If you are developing on a branch and deploying via git you must run:
remote: !
remote: ! git push heroku <branchname>:main
remote: !
remote: ! This article goes into details on the behavior:
remote: ! https://devcenter.heroku.com/articles/duplicate-build-version
remote:
remote: Verifying deploy...
remote:
remote: ! Push rejected to tb-work-hub.
remote:
To https://git.heroku.com/tb-work-hub.git
! [remote rejected] master -> master (pre-receive hook declined)
I don't understand this. It was working just fine yesterday. I'm guessing it's to do with some dependencies I was trying to work with?
If there isn't a clean solution, is there a good way to restore my app without having to start fresh, reinstall everything and copy-paste the src?
Tried: npm uninstall react-rss

Answer 1

Go to the app in Heroku -> settings -> Reveal Config Vars
Add a new config var with the key: NPM_CONFIG_LEGACY_PEER_DEPS and value true, and then redeploy.
(Heroku Shopify Application Error 'npm ERR! ERESOLVE unable to resolve dependency tree')
I hope it works.