From cd9bdd5d106a52da5b6358ec713c45f11c2765cc Mon Sep 17 00:00:00 2001
From: Konstantin Raev <bestander@gmail.com>
Date: Wed, 26 Apr 2017 17:17:19 +0100
Subject: [PATCH] fixed unary line 16: [: : integer expression expected (#3260)

---
 bin/yarn | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bin/yarn b/bin/yarn
index 4c71f7083c..727c23f8eb 100755
--- a/bin/yarn
+++ b/bin/yarn
@@ -12,7 +12,7 @@ command_exists() {
 }
 
 if command_exists node; then
-  if [ "$YARN_FORCE_WINPTY" -eq 1 ]; then
+  if [[ "$YARN_FORCE_WINPTY" -eq 1 ]]; then
     winpty node "$basedir/yarn.js" "$@"
   else
     node "$basedir/yarn.js" "$@"