[fix] silence unused type hints in generated proxy files (#6391)

Fixes #6290 for real

Author: dummdidumm

.changeset/grumpy-bugs-jog.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+[fix] silence unused type hints in generated proxy files

packages/kit/src/core/sync/write_types/index.js

@@ -561,11 +561,11 @@ export function tweak_types(content, names) {
 									);
 								} else {
 									// prevent "type X is imported but not used" (isn't silenced by @ts-nocheck) when svelte-check runs
-									code.append(`;${type};`);
+									code.append(`;null as any as ${type};`);
 								}
 							} else {
 								// prevent "type X is imported but not used" (isn't silenced by @ts-nocheck) when svelte-check runs
-								code.append(`;${type};`);
+								code.append(`;null as any as ${type};`);
 							}
 
 							modified = true;

packages/kit/src/core/sync/write_types/index.spec.js

@@ -134,7 +134,7 @@ test('Rewrites types for a TypeScript module without param', () => {
 				a: 1
 			};
 		};
-	;Get;`
+	;null as any as Get;`
 	);
 });