Add comment to prevent further regressions

raythurnvoid · raythurnvoid · commit 9c0a31feeb78 · 2025-06-04T02:30:57.000+01:00
diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
@@ -834,6 +834,9 @@ export function flushSync(fn) {
 		}
 
 		while (true) {
+			// is_flushing cannot be set to `true` before `flush_tasks` because it
+			// causes the regression at #16076, this can only be observed
+			// in browser and not in jsdom
 			flush_tasks();
 
 			if (queued_root_effects.length === 0) {

Original file line number	Diff line number	Diff line change
`@@ -834,6 +834,9 @@ export function flushSync(fn) {`
`834`	`834`	`}`
`835`	`835`
`836`	`836`	`while (true) {`
	`837`	+ // is_flushing cannot be set to `true` before `flush_tasks` because it
	`838`	`+ // causes the regression at #16076, this can only be observed`
	`839`	`+ // in browser and not in jsdom`
`837`	`840`	`flush_tasks();`
`838`	`841`
`839`	`842`	`if (queued_root_effects.length === 0) {`