$ npm i -S storm-hysteresis-nav
Either import and initialise using a named import:
import HysteresisNav from 'storm-hysteresis-nav';
HysteresisMenu.init('.js-nav');
Or async using storm-load.js, add the .standalone file to your project, then initialise using the global name:
Load('/content/js/async/storm-hysteresis-nav.standalone.js')
.then(() => {
HysteresisNav.init('.js-nav');
});