Path completions with wildcard "exports" drop necessary file extensions

[andrewbranch]

@repo/ui/bar and @repo/ui/card are not valid module specifiers via that wildcard exports. The result of a wildcard * substitution is a file lookup, so file extension adding and index directory lookups don't occur. So, the correct module specifiers would be @repo/ui/card.tsx and @repo/ui/bar.js.

Originally posted by @andrewbranch in #56412 (comment)

[andrewbranch]

From the same conversation:

Subpaths in exports also seem to break IntelliSense (auto-complete of RHS import paths does not work):

"exports": {
    "./foo/bar": "./src/bar.js",
  }