What is this?

A little SvelteKit demo app to demonstrate that form enhancement does not work as expected/documented.

Implementation detail

The structure is a bit unusual in that +page.server.ts is not used at all. It’s basically an SPA with an API which is simply the context in which I’m running into this issue.

What’s broken? Form enhancement!

According to [https://kit.svelte.dev/docs/form-actions#progressive-enhancement)(Form actions docs), the SubmitFunction can “return a callback that runs with the ActionResult”. However, in practice the result is the JSON data returned by server instead of an object with a type property and a combination of status, data and/or location based on its type.