From c2882e4f6f869f07f5681d860220216eb8336edb Mon Sep 17 00:00:00 2001
From: Thomas Watson <w@tson.dk>
Date: Mon, 16 Mar 2020 10:23:06 +0100
Subject: [PATCH] Give better stack traces for Unhandled Promise Rejection
 warnings

---
 src/setup_node_env/exit_on_warning.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/setup_node_env/exit_on_warning.js b/src/setup_node_env/exit_on_warning.js
index 5be5ccd72bd02..6321cd7ba8db0 100644
--- a/src/setup_node_env/exit_on_warning.js
+++ b/src/setup_node_env/exit_on_warning.js
@@ -35,4 +35,16 @@ if (process.noProcessWarnings !== true) {
 
     process.exit(1);
   });
+
+  // While the above warning listener would also be called on
+  // unhandledRejection warnings, we can give a better error message if we
+  // handle them separately:
+  process.on('unhandledRejection', function(reason) {
+    console.error('Unhandled Promise rejection detected:');
+    console.error();
+    console.error(reason);
+    console.error();
+    console.error('Terminating process...');
+    process.exit(1);
+  });
 }