From 070da6a7926892917f9a3077cd644bd3a1b87e76 Mon Sep 17 00:00:00 2001
From: Matthew Phillips <matthew@skypack.dev>
Date: Fri, 28 Oct 2022 14:48:20 -0400
Subject: [PATCH] Throw error when trying to use the vercel static adapter in
 server mode (#5241)

---
 .changeset/neat-cooks-fail.md                      | 5 +++++
 packages/integrations/vercel/src/static/adapter.ts | 4 ++++
 2 files changed, 9 insertions(+)
 create mode 100644 .changeset/neat-cooks-fail.md

diff --git a/.changeset/neat-cooks-fail.md b/.changeset/neat-cooks-fail.md
new file mode 100644
index 000000000..18cd44b29
--- /dev/null
+++ b/.changeset/neat-cooks-fail.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/vercel': patch
+---
+
+Fixes unknown error when using vercel/static
diff --git a/packages/integrations/vercel/src/static/adapter.ts b/packages/integrations/vercel/src/static/adapter.ts
index abc9483f5..454c42432 100644
--- a/packages/integrations/vercel/src/static/adapter.ts
+++ b/packages/integrations/vercel/src/static/adapter.ts
@@ -22,6 +22,10 @@ export default function vercelStatic(): AstroIntegration {
 			'astro:config:done': ({ setAdapter, config }) => {
 				setAdapter(getAdapter());
 				_config = config;
+
+				if(config.output === 'server') {
+					throw new Error(`${PACKAGE_NAME} should be used with output: 'static'`);
+				}
 			},
 			'astro:build:start': async () => {
 				// Ensure to have `.vercel/output` empty.