fix: avoid state_referenced_locally warning within type annotations (#11638)

* fix: avoid state_referenced_locally warning within type annotations

* better fix

* prettier

* better fix

* fix

* fix

* fix

---------

Co-authored-by: Rich Harris <[email protected]>

Author: trueadm

.changeset/popular-games-hug.md

@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+fix: avoid state_referenced_locally warning within type annotations

packages/svelte/src/compiler/phases/1-parse/remove_typescript_nodes.js

@@ -53,6 +53,24 @@ const visitors = {
 	},
 	TSTypeAliasDeclaration() {
 		return b.empty;
+	},
+	TSTypeParameterDeclaration() {
+		return b.empty;
+	},
+	TSTypeParameterInstantiation() {
+		return b.empty;
+	},
+	TSEnumDeclaration() {
+		return b.empty;
+	},
+	Identifier(node) {
+		if (node.typeAnnotation) {
+			return {
+				...node,
+				typeAnnotation: null
+			};
+		}
+		return node;
 	}
 };
 

packages/svelte/src/compiler/phases/scope.js

@@ -676,14 +676,7 @@ export function create_scopes(ast, root, allow_reactive_declarations, parent) {
 
 		TransitionDirective: SvelteDirective,
 		AnimateDirective: SvelteDirective,
-		UseDirective: SvelteDirective,
-
-		// @ts-ignore
-		TSTypeAnnotation: skip,
-		TSInterfaceDeclaration: skip,
-		TSTypeAliasDeclaration: skip,
-		TSTypeParameterDeclaration: skip,
-		TSEnumDeclaration: skip
+		UseDirective: SvelteDirective
 
 		// TODO others
 	});

packages/svelte/tests/validator/samples/static-state-reference/input.svelte

@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
 	let obj = $state({ a: 0 });
 	let count = $state(0);
 	let doubled = $derived(count * 2);
@@ -11,6 +11,8 @@
 	count = 1;
 	obj.a++;
 	obj.a = 1;
+	// @ts-ignore
+	let typed: {count: number} | null = null;
 </script>
 
 <button onclick={() => count += 1}>