WIP

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

@@ -735,9 +735,7 @@ function flush_queued_effects(effects) {
 export function schedule_effect(signal) {
 	if (!is_flushing) {
 		is_flushing = true;
-		if (!is_flushing_sync) {
+		queueMicrotask(flush_queued_root_effects);
-			queueMicrotask(flush_queued_root_effects);
-		}
 	}
 
 	var effect = (last_scheduled_effect = signal);
@@ -821,30 +819,24 @@ function process_effects(root) {
  * @returns {T}
  */
 export function flushSync(fn) {
-	var previously_flushing_sync = is_flushing_sync;
+	var result;
-
+	is_flushing_sync = true;
-	try {
-		var result;
-		is_flushing_sync = true;
 
-		if (fn) {
+	if (fn) {
-			is_flushing = true;
+		is_flushing = true;
-			flush_queued_root_effects();
+		flush_queued_root_effects();
-			result = fn();
+		result = fn();
-		}
+	}
-
-		while (true) {
-			flush_tasks();
 
-			if (queued_root_effects.length === 0) {
+	while (true) {
-				return /** @type {T} */ (result);
+		flush_tasks();
-			}
 
-			is_flushing = true;
+		if (queued_root_effects.length === 0) {
-			flush_queued_root_effects();
+			return /** @type {T} */ (result);
 		}
-	} finally {
+
-		is_flushing_sync = previously_flushing_sync;
+		is_flushing = true;
+		flush_queued_root_effects();
 	}
 }