[fix] add migration hint for renamed methods (#7874)

related to #7776

Author: dummdidumm

Diff for: .changeset/fresh-zebras-mate.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+[fix] add migration hint for renamed methods

Diff for: packages/kit/src/runtime/app/navigation.js

@@ -21,3 +21,13 @@ export const preloadData = ssr ? guard('preloadData') : client.preload_data;
 export const preloadCode = ssr ? guard('preloadCode') : client.preload_code;
 export const beforeNavigate = ssr ? () => {} : client.before_navigate;
 export const afterNavigate = ssr ? () => {} : client.after_navigate;
+
+// TODO remove for 1.0 release
+/** @param {any} _args */
+export const prefetch = (..._args) => {
+	throw new Error('prefetch has been renamed to preloadData');
+};
+/** @param {any} _args */
+export const prefetchRoutes = (..._args) => {
+	throw new Error('prefetchRoutes has been renamed to preloadCode');
+};