install yarn

install/21-yarn.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+# yarn is installed
+if not_installed "yarn"; then
+
+    echo "Installing yarn..."
+
+    # Install nvm
+    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+    echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+    update 
+    sudo apt install --no-install-recommends yarn
+
+fi
+
+echo "yarn is installed"
+yarn --version