fix

Author: Rich-Harris

packages/svelte/src/internal/client/dom/blocks/async.js

@@ -14,10 +14,13 @@ export function async(node, expressions, fn) {
 	boundary.update_pending_count(1);
 
 	flatten([], expressions, (values) => {
-		// get values eagerly to avoid creating blocks if they reject
-		for (const d of values) get(d);
+		try {
+			// get values eagerly to avoid creating blocks if they reject
+			for (const d of values) get(d);
 
-		fn(node, ...values);
-		boundary.update_pending_count(-1);
+			fn(node, ...values);
+		} finally {
+			boundary.update_pending_count(-1);
+		}
 	});
 }

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

@@ -27,16 +27,17 @@ export function flatten(sync, async, fn) {
 
 		Promise.all(async.map((expression) => async_derived(expression)))
 			.then((result) => {
-				if ((parent.f & DESTROYED) !== 0) return;
-
 				batch?.activate();
 
 				restore();
 
 				try {
 					fn([...sync.map(d), ...result]);
 				} catch (error) {
-					invoke_error_boundary(error, parent);
+					// ignore errors in blocks that have already been destroyed
+					if ((parent.f & DESTROYED) === 0) {
+						invoke_error_boundary(error, parent);
+					}
 				}
 
 				batch?.deactivate();

packages/svelte/tests/runtime-runes/samples/async-block-reject-each-during-init/_config.js

@@ -2,23 +2,24 @@ import { tick } from 'svelte';
 import { test } from '../../test';
 
 export default test({
-	async test({ assert, target }) {
-		const [increment, shift] = target.querySelectorAll('button');
+	async test({ assert, target, errors }) {
+		const [increment, resolve, reject] = target.querySelectorAll('button');
 
 		increment.click();
 		await tick();
 
-		shift.click();
+		reject.click();
 		await tick();
 
-		shift.click();
+		resolve.click();
 		await tick();
 
 		assert.htmlEqual(
 			target.innerHTML,
 			`
 				<button>increment</button>
-				<button>shift</button>
+				<button>resolve</button>
+				<button>reject</button>
 				<p>false</p>
 				<p>1</p>
 			`