[BUG] Issues when using workspaces

[lee5i3]

We are having issues with our monorepo project, our package.json has

{
  "private": true,
  "workspaces": [
    "common",
    "base-tests",
    "ttic-fl-ho3",
    "ttic-fl-af3",
    "hcpc-sc-af3",
    "hcpc-nj-af3",
    "ttic-ga-ho3"
  ]
}

When we ran npm install, it use to run fine.. now says

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/sinon
npm ERR!   dev sinon@"^9.0.1" from [email protected]
npm ERR!   common
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer sinon@"5 - 7" from [email protected]
npm ERR! node_modules/sinon-mongoose
npm ERR!   dev sinon-mongoose@"^2.3.0" from [email protected]
npm ERR!   common
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 /Users/lhull/.npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/lhull/.npm/_logs/2021-02-02T22_00_46_902Z-debug.log

This worked on v7.5.0 but now errors on 7.5.1+

2021-02-02T22_00_46_902Z-debug.log

[plotka]

I had a similar issue, I solved it by deleting the node-modules folder in the root and by running npm install --legacy-peer-deps

[darcyclarke]

@lee5i3 can you try installing the latest v7 & see if you can reproduce it? (ie. npm install -g npm - 7.6.0)

[ruyadorno]

I'm going to go ahead and close this one due to inactivity, for more context we have been fixing a lot of these ERESOLVE edge case problems during npm install in the last few months and it's very likely that this one might already have been fixed.

In case anyone arrives here with the same problem, feel free to create a new issue and reference/link to this one.

Thanks!