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fix: wrap async children in $$renderer.async #16862

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Merged
merged 1 commit into from
Sep 29, 2025
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fix: wrap async children in $$renderer.async #16862

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5 changes: 5 additions & 0 deletions .changeset/rude-terms-confess.md
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@@ -0,0 +1,5 @@
---
'svelte': patch
---

fix: wrap async `children` in `$$renderer.async`
7 changes: 6 additions & 1 deletion packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/component.js
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Expand Up @@ -242,7 +242,12 @@ export function build_inline_component(node, expression, context) {
params.push(pattern);
}

const slot_fn = b.arrow(params, b.block(block.body));
const slot_fn = b.arrow(
params,
node.fragment.metadata.has_await
? b.block([create_async_block(b.block(block.body))])
: b.block(block.body)
);

if (slot_name === 'default' && !has_children_prop) {
if (
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1 change: 1 addition & 0 deletions packages/svelte/tests/server-side-rendering/samples/async-children/_expected.html
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@@ -0,0 +1 @@
<!--[--><!--[--><!---->1<!--]--><!----><!--]-->
4 changes: 4 additions & 0 deletions packages/svelte/tests/server-side-rendering/samples/async-children/component.svelte
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<script>
const { children } = $props();
</script>
{@render children()}
7 changes: 7 additions & 0 deletions packages/svelte/tests/server-side-rendering/samples/async-children/main.svelte
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@@ -0,0 +1,7 @@
<script>
import Component from "./component.svelte";
</script>
<Component>
{@const one = await 1}
{one}
</Component>
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