tweak

packages/svelte/src/internal/client/reactivity/batch.js

@@ -349,11 +349,14 @@ export class Batch {
 
 		this.#callbacks.clear();
 
+		if (batches.size > 1) {
+			const effects = new Set();
+
 			/**
 			 * @param {Value} value
 			 * @param {Set<Effect>} effects
 			 */
-		function get_async_effects(value, effects) {
+			const get_async_effects = (value, effects) => {
 				if (value.reactions !== null) {
 					for (const reaction of value.reactions) {
 						const flags = reaction.f;
@@ -365,10 +368,7 @@ export class Batch {
 						}
 					}
 				}
-		}
+			};
-
-		if (batches.size > 1) {
-			const effects = new Set();
 
 			for (const source of this.current.keys()) {
 				// TODO do we also need block effects?