From f0f8fd195e117f38f41e210ec0403e1467f5fdfb Mon Sep 17 00:00:00 2001
From: Rhys Arkins <rhys@arkins.net>
Date: Sat, 22 Feb 2020 07:12:03 +0100
Subject: [PATCH] fix: stdout/err initialization

---
 lib/manager/npm/post-update/yarn.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/manager/npm/post-update/yarn.ts b/lib/manager/npm/post-update/yarn.ts
index e808e5767f1475..bebb380002860e 100644
--- a/lib/manager/npm/post-update/yarn.ts
+++ b/lib/manager/npm/post-update/yarn.ts
@@ -23,8 +23,8 @@ export async function generateLockFile(
   const { binarySource } = config;
   logger.debug(`Spawning yarn install to create ${cwd}/yarn.lock`);
   let lockFile = null;
-  let stdout: string;
-  let stderr: string;
+  let stdout = '';
+  let stderr = '';
   let cmd: string;
   try {
     try {