From 7880a0736f9b529a611c2f3a43f4712ff603fa45 Mon Sep 17 00:00:00 2001
From: Jordi Oliveras Rovira <jordi.oliveras.rovira@gmail.com>
Date: Tue, 17 Jul 2018 20:28:57 +0200
Subject: [PATCH] Fixes 25657. Jakefile: make concatenateFiles third parameter
 optional.

---
 Jakefile.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Jakefile.js b/Jakefile.js
index 1dc4be82fae..4a650b612fe 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -817,7 +817,7 @@ function diagnosticsToString(diagnostics, pretty) {
  * Concatenate a list of sourceFiles to a destinationFile
  * @param {string} destinationFile
  * @param {string[]} sourceFiles
- * @param {string} extraContent
+ * @param {string=} extraContent
  */
 function concatenateFiles(destinationFile, sourceFiles, extraContent) {
     var temp = "temptemp";