found a prettier bug :) this one formats twice until its end state

packages/svelte/src/main/public.d.ts

@@ -195,9 +195,7 @@ declare const SnippetReturn: unique symbol;
  * You can only call a snippet through the `{@render ...}` tag.
  */
 export interface Snippet<T = void> {
-	(
+	(arg: T): typeof SnippetReturn & {
-		arg: T
-	): typeof SnippetReturn & {
 		_: 'functions passed to {@render ...} tags must use the `Snippet` type imported from "svelte"';
 	};
 }