fix: stricter types for sveltekit link options (#17366)

TypeScript now rejects invalid values (false, numbers) for data-sveltekit-* attributes.

.changeset/slick-months-play.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: type check for link options

packages/svelte/elements.d.ts

@@ -868,9 +868,6 @@ export interface HTMLAttributes<T extends EventTarget> extends AriaAttributes, D
 	'data-sveltekit-reload'?: true | '' | 'off' | undefined | null;
 	'data-sveltekit-replacestate'?: true | '' | 'off' | undefined | null;
 
-	// allow any data- attribute
-	[key: `data-${string}`]: any;
-
 	// allow any attachment and falsy values (by using false we prevent the usage of booleans values by themselves)
 	[key: symbol]: Attachment<T> | false | undefined | null;
 }

packages/svelte/tests/types/link-options.svelte

@@ -0,0 +1,22 @@
+<div
+  {/* @ts-expect-error */}
+  data-sveltekit-keepfocus={3}
+  
+  {/* @ts-expect-error */}
+  data-sveltekit-noscroll={false}
+  
+  {/* @ts-expect-error */}
+  data-sveltekit-preload-code={3}
+  
+  {/* @ts-expect-error */}
+  data-sveltekit-preload-data={3}
+  
+  {/* @ts-expect-error */}
+  data-sveltekit-reload={'invalid'}
+  
+  {/* @ts-expect-error */}
+  data-sveltekit-replacestate={'hover'}
+  
+  {/* @ts-expect-error */}
+  class={3}
+></div>