From 14136f88fc81b10611f46d475932b5dcbea96653 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fatih=20=C3=87ak=C4=B1r?=
<108465492+wfatih@users.noreply.github.com>
Date: Tue, 6 Oct 2026 12:18:44 +0300
Subject: [PATCH] fix: print `{#await}` blocks that only have a pending branch
(#18908)
---
.changeset/print-await-pending-only.md | 5 +++++
packages/svelte/src/compiler/print/index.js | 4 +++-
packages/svelte/tests/print/samples/await-block/input.svelte | 4 ++++
.../svelte/tests/print/samples/await-block/output.svelte | 4 ++++
4 files changed, 16 insertions(+), 1 deletion(-)
create mode 100644 .changeset/print-await-pending-only.md
diff --git a/.changeset/print-await-pending-only.md b/.changeset/print-await-pending-only.md
new file mode 100644
index 0000000000..677dc73fc0
--- /dev/null
+++ b/.changeset/print-await-pending-only.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: print `{#await}` blocks that only have a pending branch
diff --git a/packages/svelte/src/compiler/print/index.js b/packages/svelte/src/compiler/print/index.js
index 554e788654..5696a68462 100644
--- a/packages/svelte/src/compiler/print/index.js
+++ b/packages/svelte/src/compiler/print/index.js
@@ -754,7 +754,9 @@ const svelte_visitors = (comments, state) => ({
if (node.pending) {
context.write('}');
block(context, node.pending, state.preserve_whitespace > 0);
- context.write('{:');
+ if (node.then || node.catch) {
+ context.write('{:');
+ }
} else {
context.write(' ');
}
diff --git a/packages/svelte/tests/print/samples/await-block/input.svelte b/packages/svelte/tests/print/samples/await-block/input.svelte
index ba0ba8c882..029f31bf53 100644
--- a/packages/svelte/tests/print/samples/await-block/input.svelte
+++ b/packages/svelte/tests/print/samples/await-block/input.svelte
@@ -34,3 +34,7 @@
{:catch}
Something went wrong
{/await}
+
+{#await promise}
+ waiting for the promise to resolve...
+{/await}
diff --git a/packages/svelte/tests/print/samples/await-block/output.svelte b/packages/svelte/tests/print/samples/await-block/output.svelte
index ba0ba8c882..029f31bf53 100644
--- a/packages/svelte/tests/print/samples/await-block/output.svelte
+++ b/packages/svelte/tests/print/samples/await-block/output.svelte
@@ -34,3 +34,7 @@
{:catch}
Something went wrong
{/await}
+
+{#await promise}
+ waiting for the promise to resolve...
+{/await}