npm + yarn => nyarm
Can you answer npm or yarn in your project? You can use just nyarm for all your project.
$ npm install -g nyarm
# or
$ yarn global add nyarm
$ nyarm {install | add}
# npm project => npm install
# yarn project => yarn install
$ nyarm {install | add} foobar
# npm project => npm install foobar
# yarn project => yarn add foobar
$ nyarm {uninstall | remove} foobar
# npm project => npm uninstall foobar
# yarn project => yarn remove foobar
MIT