With a new major version, eslint deprecated the way we used to write config files, a migration package exists but does not fully support migrating .eslintrc.js files yet. It would be a good opportunity to have a look at our eslint config and try to simplify/unify/globalize it. It might be also a good idea to create a dedicated package for the repo that's not published but exports a common config for all other packages.

Related PR (closed): #3339