chore: simplify signal capturing logic (#14281)

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

@@ -13,7 +13,7 @@ import { derived, derived_safe_equal } from './deriveds.js';
 import {
 	active_effect,
 	get,
-	is_signals_recorded,
+	captured_signals,
 	set_active_effect,
 	untrack,
 	update
@@ -390,7 +390,7 @@ export function prop(props, key, flags, fallback) {
 	return function (/** @type {any} */ value, /** @type {boolean} */ mutation) {
 		// legacy nonsense — need to ensure the source is invalidated when necessary
 		// also needed for when handling inspect logic so we can inspect the correct source signal
-		if (is_signals_recorded) {
+		if (captured_signals !== null) {
 			// set this so that we don't reset to the parent value if `d`
 			// is invalidated because of `invalidate_inner_signals` (rather
 			// than because the parent or child value changed)

packages/svelte/src/internal/client/runtime.js

@@ -128,8 +128,8 @@ let current_version = 0;
 // to prevent memory leaks, we skip adding the reaction.
 export let skip_reaction = false;
 // Handle collecting all signals which are read during a specific time frame
-export let is_signals_recorded = false;
-let captured_signals = new Set();
+/** @type {Set<Value> | null} */
+export let captured_signals = null;
 
 // Handling runtime component context
 /** @type {ComponentContext | null} */
@@ -732,7 +732,7 @@ export function get(signal) {
 		return value;
 	}
 
-	if (is_signals_recorded) {
+	if (captured_signals !== null) {
 		captured_signals.add(signal);
 	}
 
@@ -800,21 +800,18 @@ export function safe_get(signal) {
  * @param {() => any} fn
  */
 export function invalidate_inner_signals(fn) {
-	var previous_is_signals_recorded = is_signals_recorded;
 	var previous_captured_signals = captured_signals;
-	is_signals_recorded = true;
 	captured_signals = new Set();
 	var captured = captured_signals;
 	var signal;
 	try {
 		untrack(fn);
-	} finally {
-		is_signals_recorded = previous_is_signals_recorded;
-		if (is_signals_recorded) {
+		if (previous_captured_signals !== null) {
 			for (signal of captured_signals) {
 				previous_captured_signals.add(signal);
 			}
 		}
+	} finally {
 		captured_signals = previous_captured_signals;
 	}
 	for (signal of captured) {