+if [[ $(node --version) < $nodeMinVersion ]]; then
+ echo 'You need node >= 6'
+ exit 0
+fi
+
+if [[ $(npm --version) < $npmMinVersion ]]; then
+ echo 'You need npm >= 3'
+ exit 0
+fi
+
+if ! which yarn > /dev/null; then
+ echo 'You need yarn'
+ exit 0
+fi