How to enable format on save for svelte(kit) ?

[beeb]

I installed the svelte language server which works, but the code doesn't get auto formatted on save.

Is there something specific I need to do to enable this?

I tried to add the following to my languages.toml to no avail:

[[language]]
name = "svelte"
formatter = { command = "prettier" }
auto-format = true

[beeb]

It seems the following is working:

[[language]]
name = "svelte"
auto-format = true