From b82d21f856499908aa6400f097df3367992586e1 Mon Sep 17 00:00:00 2001
From: Patrick Niklaus <patrick.niklaus@student.kit.edu>
Date: Fri, 7 Apr 2017 07:47:41 +0000
Subject: [PATCH] Install yarn when not there

---
 .travis.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index cc364bca6..7b63a7070 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -192,6 +192,9 @@ before_install:
     if [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then
       export JOBS=$((`sysctl -n hw.ncpu` + 1))
       sudo mdutil -i off /
+    fi
+  - |
+    if [[ ! -f $(which yarn) ]]; then
       npm install -g yarn
     fi
   - export PACKAGE_JSON_VERSION=$(node -e "console.log(require('./package.json').version)")