From a45a6775eb10114e275afcac5d86948238c3791d Mon Sep 17 00:00:00 2001
From: mikew <wyatt.mike@gmail.com>
Date: Wed, 26 Apr 2017 07:57:30 -0700
Subject: [PATCH] Change `use_winpty` logic in bin/yarn to just look at
 YARN_FORCE_WINPTY in environment (#3245)

---
 bin/yarn | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/bin/yarn b/bin/yarn
index ac4a86a751..4c71f7083c 100755
--- a/bin/yarn
+++ b/bin/yarn
@@ -2,12 +2,9 @@
 argv0=$(echo "$0" | sed -e 's,\\,/,g')
 basedir=$(dirname "$(readlink "$0" || echo "$argv0")")
 
-use_winpty=0
-
 case "$(uname -s)" in
   Linux) basedir=$(dirname "$(readlink -f "$0" || echo "$argv0")");;
   *CYGWIN*) basedir=`cygpath -w "$basedir"`;;
-  MSYS*|MINGW*) use_winpty=1;;
 esac
 
 command_exists() {
@@ -15,7 +12,7 @@ command_exists() {
 }
 
 if command_exists node; then
-  if [ $use_winpty -eq 1 ]; then
+  if [ "$YARN_FORCE_WINPTY" -eq 1 ]; then
     winpty node "$basedir/yarn.js" "$@"
   else
     node "$basedir/yarn.js" "$@"