Undeclared peer dependency between @bull-board/api and @bull-board/ui breaks with yarn's PnP system

[JasonMan34]

Yarn's PnP system considers accessing the @bull-board/ui package without listing it as a dependency dangerous, so it fails to run (repro here)

This causes the @bull-board/express package to break when using yarn with PnP:

Error: @bull-board/api tried to access @bull-board/ui, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.

Required package: @bull-board/ui (via "@bull-board/ui/package.json")
Required by: @bull-board/api@npm:5.1.1 (via /Users/user/repos/bull-board-yarn-dep-bug/.yarn/cache/@bull-board-api-npm-5.1.1-533fa06b5d-b4570ef330.zip/node_modules/@bull-board/api/dist/src/)

Listing @bull-board/ui is a peer dependency or @bull-board/api should resolve this issue