Fix yarn V2 compatibility.

[chrsep]

Fixes #933. Adds dependency rules required by yarn v2.

[2075]

hey @jxnblkm will this be merged or shall we fork / trash previous work using rebass? thx for update :)

[merceyz]

This isn't Yarn 2 specific so there is no need to label it as such, it's an issue that should be fixed for all package managers, though Yarn in PnP mode is the only one capable of telling you what is broken at the moment https://yarnpkg.com/advanced/rulebook#packages-should-only-ever-require-what-they-formally-list-in-their-dependencies

hey @jxnblkm will this be merged or shall we fork / trash previous work using rebass? thx for update :)

@2075 You can use packageExtensions to fix this locally while you wait, this PR will also be applied automatically in the next release of Yarn