I did a similar script but running in deno. Curiously, I have to set the createClient option

auth.persistSession: false

or it won't return with a session at all. Deno does have localStorage API so that confused me. Anyhow, thanks for writing that -- I need to make a bunch of CLI tools and this confirms how to do it. Also, deno never exits the script until you call

Deno.exit()

.