Support Importing Form Action Handlers with Automatic Path Resolution

Describe the problem

When creating forms in SvelteKit, the action attribute requires specifying the exact path as a string, for example:

// +page.server.ts

export const actions = {
  createTask: async () => {
    // ...
  }
}

// +page.svelte

<form method="POST" action="?/createTask">
  <!-- form fields -->
</form>

This approach means developers must manually manage and update form action paths, which can become error-prone and tedious, especially when reusing form components across different routes or modals. If the form’s route moves or if you want to use the same form in several places, the hardcoded string path needs to be updated in every instance.

Describe the proposed solution

Introduce a feature that allows developers to import a server action or handler and use it directly as the form's action attribute. SvelteKit would then resolve and inject the correct path at build or runtime. For example, instead of specifying a string path, the form could use:

<script>
import { actions } from './+page.server.ts'; // not allowed, because server code should not be imported on the client
// or import { createTask } from '$lib/server/actions';

</script>

<form method="POST" action={actions.createTask}>
  <!-- form fields -->
</form>

Internally, SvelteKit would map the imported handler to its correct route and inject the appropriate action path string.

Maybe a helper utility could also solve the problem, e.g. getActionPath(…)

Alternatives considered

Astro does something similar, https://docs.astro.build/en/guides/actions/

Importance

nice to have

Additional Information

No response

Start by reviewing the +page.server.ts and +page.svelte examples, including the proposed $lib/server/actions import boundary, and trace how form action paths are currently represented. Define the supported import and route-resolution behavior before implementation; done means reusable forms can reference handlers without hardcoded paths and the behavior is covered by tests.