optimise with set

Author: trueadm

packages/svelte/src/reactivity/map.js

@@ -105,7 +105,10 @@ export class SvelteMap extends Map {
 			increment(s);
 
 			// if not every reaction of s is a reaction of version we need to also include version
-			const needs_version_increase = !s.reactions?.every((r) => version.reactions?.includes(r));
+			let v_reactions = version.reactions === null ? null : new Set(version.reactions);
+			var needs_version_increase =
+				v_reactions === null || !s.reactions?.every((r) => v_reactions.has(r));
+
 			if (needs_version_increase) {
 				increment(version);
 			}