invalidate store values in <script> block - fixes #3537

src/compiler/compile/utils/invalidate.ts

@@ -18,7 +18,8 @@ export function invalidate(component: Component, scope: Scope, code: MagicString
 			(
 				variable.referenced ||
 				variable.is_reactive_dependency ||
-				variable.export_name
+				variable.export_name ||
+				variable.name[0] === '$'
 			)
 		);
 	});

test/runtime/samples/store-unreferenced/Nested.svelte

@@ -0,0 +1,5 @@
+<script>
+	import { count } from './store.js';
+</script>
+
+<p>count: {$count}</p>

test/runtime/samples/store-unreferenced/_config.js

@@ -0,0 +1,13 @@
+import { count } from './store.js';
+
+export default {
+	html: `<p>count: 0</p>`,
+
+	async test({ assert, component, target }) {
+		await component.increment();
+
+		assert.htmlEqual(target.innerHTML, `<p>count: 1</p>`);
+
+		count.set(0);
+	}
+};

test/runtime/samples/store-unreferenced/main.svelte

@@ -0,0 +1,10 @@
+<script>
+	import Nested from './Nested.svelte';
+	import { count } from './store.js';
+
+	export function increment() {
+		$count++;
+	}
+</script>
+
+<Nested />

test/runtime/samples/store-unreferenced/store.js

@@ -0,0 +1,3 @@
+import { writable } from '../../../../store';
+
+export const count = writable(0);