fix: wait an extra microtask in dev before calling $$_init_$$

.changeset/empty-animals-retire.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: wait an extra microtask in dev before calling `$$_init_$$`

packages/kit/src/exports/vite/index.js

@@ -698,13 +698,21 @@ async function kit({ svelte_config }) {
 			remotes.push(remote);
 
 			if (opts?.ssr) {
+				// we need to add an `await Promise.resolve()` because if the user imports this function
+				// on the client AND in a load function when loading the client module we will trigger
+				// an ssrLoadModule during dev. During a link preload the the module can be mistakenly
+				// loaded and transformed twice and the first time all its exports would be undefined
+				// triggering a dev server error. By adding a microtask we ensure that the module is fully loaded
+
 				// Extra newlines to prevent syntax errors around missing semicolons or comments
 				code +=
 					'\n\n' +
 					dedent`
 					import * as $$_self_$$ from './${path.basename(id)}';
 					import { init_remote_functions as $$_init_$$ } from '@sveltejs/kit/internal';
 
+					${dev_server ? 'await Promise.resolve()' : ''}
+
 					$$_init_$$($$_self_$$, ${s(file)}, ${s(remote.hash)});
 
 					for (const [name, fn] of Object.entries($$_self_$$)) {