From 41c90de21806605ab0aec2cbefdbde8ea4312226 Mon Sep 17 00:00:00 2001
From: Sebastian Markbage <sema@fb.com>
Date: Wed, 8 May 2019 17:38:10 -0700
Subject: [PATCH] Default timeoutMs to low pri expiration if not provided

This is a required argument in the type signature but people may not
supply it and this is a user facing object.
---
 packages/react-reconciler/src/ReactFiberScheduler.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/react-reconciler/src/ReactFiberScheduler.js b/packages/react-reconciler/src/ReactFiberScheduler.js
index 9ad32b402ce7c..ef077db5293e3 100644
--- a/packages/react-reconciler/src/ReactFiberScheduler.js
+++ b/packages/react-reconciler/src/ReactFiberScheduler.js
@@ -274,7 +274,7 @@ export function computeExpirationForFiber(
     // Compute an expiration time based on the Suspense timeout.
     expirationTime = computeSuspenseExpiration(
       currentTime,
-      suspenseConfig.timeoutMs | 0,
+      suspenseConfig.timeoutMs | 0 || LOW_PRIORITY_EXPIRATION,
     );
   } else {
     // Compute an expiration time based on the Scheduler priority.
@@ -1028,7 +1028,7 @@ function inferTimeFromExpirationTime(
   return (
     earliestExpirationTimeMs -
     (suspenseConfig !== null
-      ? suspenseConfig.timeoutMs | 0
+      ? suspenseConfig.timeoutMs | 0 || LOW_PRIORITY_EXPIRATION
       : LOW_PRIORITY_EXPIRATION)
   );
 }