From 78a1bad8b715a101cc9d9087f5c3957d2550bf76 Mon Sep 17 00:00:00 2001
From: Ben McCann <322311+benmccann@users.noreply.github.com>
Date: Thu, 30 Dec 2021 12:13:26 -0800
Subject: [PATCH] [fix] only add handlers for directories that exist

---
 .changeset/little-tables-decide.md   |  5 +++
 packages/adapter-node/src/handler.js | 48 +++++++++++++++-------------
 2 files changed, 30 insertions(+), 23 deletions(-)
 create mode 100644 .changeset/little-tables-decide.md

diff --git a/.changeset/little-tables-decide.md b/.changeset/little-tables-decide.md
new file mode 100644
index 000000000000..4389ec468342
--- /dev/null
+++ b/.changeset/little-tables-decide.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-node': patch
+---
+
+[fix] only add handlers for directories that exist
diff --git a/packages/adapter-node/src/handler.js b/packages/adapter-node/src/handler.js
index 1bfeecb2b3af..ca766e68ca9c 100644
--- a/packages/adapter-node/src/handler.js
+++ b/packages/adapter-node/src/handler.js
@@ -1,3 +1,4 @@
+import fs from 'fs';
 import path from 'path';
 import sirv from 'sirv';
 import { fileURLToPath } from 'url';
@@ -14,28 +15,22 @@ const app = new App(manifest);
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
-const serve_client = sirv(path.join(__dirname, '/client'), {
-	etag: true,
-	maxAge: 31536000,
-	immutable: true,
-	gzip: true,
-	brotli: true
-});
-
-const serve_static = sirv(path.join(__dirname, '/static'), {
-	etag: true,
-	maxAge: 31536000,
-	immutable: true,
-	gzip: true,
-	brotli: true
-});
-
-const serve_prerendered = sirv(path.join(__dirname, '/prerendered'), {
-	etag: true,
-	maxAge: 0,
-	gzip: true,
-	brotli: true
-});
+/**
+ * @param {string} path
+ * @param {number} max_age
+ */
+function serve(path, max_age) {
+	return (
+		fs.existsSync(path) &&
+		sirv(path, {
+			etag: true,
+			maxAge: max_age,
+			immutable: true,
+			gzip: true,
+			brotli: true
+		})
+	);
+}
 
 /** @type {import('polka').Middleware} */
 const ssr = async (req, res) => {
@@ -83,4 +78,11 @@ function sequence(handlers) {
 	};
 }
 
-export const handler = sequence([serve_client, serve_static, serve_prerendered, ssr]);
+export const handler = sequence(
+	[
+		serve(path.join(__dirname, '/client'), 31536000),
+		serve(path.join(__dirname, '/static'), 31536000),
+		serve(path.join(__dirname, '/prerendered'), 0),
+		ssr
+	].filter(Boolean)
+);