From 3d28fb10cd93dc33fdc174aabbb107f1cde4ade2 Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Fri, 25 May 2018 11:56:29 +0100
Subject: [PATCH] add comment about filtering

---
 packages/jest-cli/src/cli/index.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packages/jest-cli/src/cli/index.js b/packages/jest-cli/src/cli/index.js
index de692efe8829..86e167428c9a 100644
--- a/packages/jest-cli/src/cli/index.js
+++ b/packages/jest-cli/src/cli/index.js
@@ -108,6 +108,8 @@ export const runCLI = async (
 
     const stacks = new Set();
 
+    // E.g. timeouts might give multiple traces to the same line of code
+    // This hairy filtering tries to remove entries with duplicate stack traces
     const uniqueErrors = formatted.filter(handle => {
       const ansiFree: string = stripAnsi(handle);