Export subfolder from the package

I have a Typescript package

package.json
src/
  index.ts
  common/
    index.ts
  sub/
    index.ts

I want to be able to:

import {...} from '<package>';
import {...} from '<package>/sub';

But not for <package>/common

Is that possible to do that without custom declaration files?

My package.json looks based on this:

"exports": {
  ".": "./dist/index.js",
  "./common": "./dist/common/index.js"
},
"typesVersions": {
  "*": {
    "common": ["declarations/common/index.d.ts"]
  }
}

With this approach, I don't have any issues with the Typescript part. But once I'm trying to build it, it fails with JS:

Module not found: Error: Can't resolve '<package>/sub' in '...'