From e9dbb032072e5c630978825715f3898ade7657ee Mon Sep 17 00:00:00 2001
From: Chauncey McAskill <chauncey@locomotive.ca>
Date: Thu, 10 Aug 2023 11:01:50 -0400
Subject: [PATCH] Fix support for undefined tasks in watch.js

Amends 596ff7a8ee812b5566ba6c068dfaccd59ef4ba51
---
 build/watch.js | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/build/watch.js b/build/watch.js
index 00da6a77..3b0eba7a 100644
--- a/build/watch.js
+++ b/build/watch.js
@@ -70,16 +70,18 @@ function configureServer(server, { paths, tasks }) {
     });
 
     // Watch source concats
-    server.watch(
-        resolve(
-            tasks.concats.reduce(
-                (patterns, { includes }) => patterns.concat(includes),
-                []
+    if (tasks.concats?.length) {
+        server.watch(
+            resolve(
+                tasks.concats.reduce(
+                    (patterns, { includes }) => patterns.concat(includes),
+                    []
+                )
             )
-        )
-    ).on('change', () => {
-        concatFiles(...developmentConcatFilesArgs);
-    });
+        ).on('change', () => {
+            concatFiles(...developmentConcatFilesArgs);
+        });
+    }
 
     // Watch source styles
     server.watch(