Yarn Version Policy

[shetharp]

After setting up ESLint in the workspace root, I was getting the following error.

An unexpected error occurred: "expected workspace package to exist for \"eslint\"".

There is ongoing discussion around the cause (yarnpkg/yarn#7807), but I was able to resolve it by running

yarn policies set-version 1.18.0

TODO: Once the issue is resolved with Yarn or another workaround is found, I need to delete the .yarnrc file and .yarn folder which contains the source code copy of Yarn version 1.18.0.