babelrcRoots cross-package visibility boundary in Babel 7 monorepo
Goal: Determine whether a .babelrc file in one workspace package can be applied to source files in another package when babelrcRoots is not explicitly configured. Constraint: Babel 7.x with @babel/core restricts .babelrc visibility to the package root by default, but rootMode and babelrcRoots can extend that boundary. It is unresolved whether the default bou