Invalid group definition for package if types for it are defined locally.

[dartess]

I have a package lunr
For it, the types @types/lunr are installed.
The types are added locally to @types/lunr.d.ts (also ./@types added in tsconfig's compilerOptions.typeRoots).
After that, the package lunr is considered internal, not external. After removing @types/lunr.d.ts, everything works correctly.