Blobs can be organised using "directories" e.g.

/animals
  all-animals.txt
  /dogs
    sausage.txt
  /cats
    tom.txt

is really only three files: /animals/all-animals.txt, /animals/dogs/sausage.txt and /animals/cats/tom.txt because directories don't really exist, we're just making longer filenames.

When you want to list things only "in a directory" and none of the child "directories", you can use this val.

Create val
import { blobDirList } from "https://esm.town/v/neverstew/blobDirList";

console.log(await blobDirList("/animals"));
// returns only "/animals/all-animals.txt"