From ed70a0b381144b387698f2d57001f5a7bc82cbe9 Mon Sep 17 00:00:00 2001
From: Michael Lumish <mlumish@google.com>
Date: Tue, 27 Jun 2023 10:11:45 -0700
Subject: [PATCH] Fix handling of OD policy with no child

---
 packages/grpc-js/src/load-balancer-outlier-detection.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/grpc-js/src/load-balancer-outlier-detection.ts b/packages/grpc-js/src/load-balancer-outlier-detection.ts
index 885c4feb..ce8668f1 100644
--- a/packages/grpc-js/src/load-balancer-outlier-detection.ts
+++ b/packages/grpc-js/src/load-balancer-outlier-detection.ts
@@ -113,7 +113,7 @@ export class OutlierDetectionLoadBalancingConfig implements LoadBalancingConfig
     failurePercentageEjection: Partial<FailurePercentageEjectionConfig> | null,
     private readonly childPolicy: LoadBalancingConfig[]
   ) {
-    if (childPolicy[0].getLoadBalancerName() === 'pick_first') {
+    if (childPolicy.length > 0 && childPolicy[0].getLoadBalancerName() === 'pick_first') {
       throw new Error('outlier_detection LB policy cannot have a pick_first child policy');
     }
     this.intervalMs = intervalMs ?? 10_000;