From 00392b191fde94afeb60aad6cbe660a1ee4c4187 Mon Sep 17 00:00:00 2001
From: Patrik Oldsberg <poldsberg@gmail.com>
Date: Fri, 31 Mar 2023 11:13:52 +0200
Subject: [PATCH] config-loader: fix for MergedConfigSource merge optimization

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
---
 packages/config-loader/src/sources/MergedConfigSource.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/config-loader/src/sources/MergedConfigSource.ts b/packages/config-loader/src/sources/MergedConfigSource.ts
index 206290b383..2b67bb7080 100644
--- a/packages/config-loader/src/sources/MergedConfigSource.ts
+++ b/packages/config-loader/src/sources/MergedConfigSource.ts
@@ -29,7 +29,7 @@ export class MergedConfigSource implements ConfigSource {
   // An optimization to flatten nested merged sources to avid unnecessary microtasks
   static #flattenSources(sources: ConfigSource[]): ConfigSource[] {
     return sources.flatMap(source => {
-      if (sourcesSymbol in source) {
+      if (sourcesSymbol in source && Array.isArray(source[sourcesSymbol])) {
         return this.#flattenSources(source[sourcesSymbol] as ConfigSource[]);
       }
       return source;