fix: Mac node install (react-native-community#47 by @vonovak)

Author: vonovak

src/commands/setup_macos_executor.yml

@@ -24,14 +24,14 @@ steps:
 
   - run: 
       name: Install node@<<parameters.node_version>>
+      # after `curl`, bashrc contains the script to load nvm, we need to source it to use it
       command: |
-          set +e         
-          touch $BASH_ENV    
-          curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.5/install.sh | bash
-          echo 'export NVM_DIR="$HOME/.nvm"' >> $BASH_ENV
-          echo '[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"' >> $BASH_ENV
-          echo nvm install <<parameters.node_version>> >> $BASH_ENV
-          echo nvm alias default <<parameters.node_version>> >> $BASH_ENV
+        set +e
+        curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.35.3/install.sh | bash
+        source ~/.bashrc
+        command -v nvm
+        nvm install <<parameters.node_version>>
+        nvm alias default <<parameters.node_version>>
   - run:
       name: Verify node version
       command: node --version