How to import H3 Spatial Index modules into NodeJS App

I am trying to load a module called ‘geojson2h3’ in my NodeJS app. After running npm install geojson2h3, I tried following the initial code instructions given in Github to test it out:

import geojson2h3 from 'geojson2h3';

const polygon = {
  type: 'Feature',
  geometry: {
    type: 'Polygon',
     coordinates: [
      [
        [-122.47485823276713, 37.85878356045377],
        [-122.47504834087829, 37.86196795698972],
        [-122.47845104316997, 37.86010614563313],
        [-122.47485823276713, 37.85878356045377]
      ]
    ]
  }
};

const hexagons = geojson2h3.featureToH3Set(polygon, 10);
// -> ['8a2830855047fff', '8a2830855077fff', '8a283085505ffff', '8a283085506ffff']

const feature = geojson2h3.h3SetToFeature(hexagons);
// -> {type: 'Feature', properties: {}, geometry: {type: 'Polygon', coordinates: [...]}}

This method throws a SyntaxError: Cannot use import statement outside a module error. I then tried using the NodeJS require method as such: const geojson2h3 = require('geojson2h3');, replacing the import statement. This throws an Uncaught Error: undefinedModule error. The package shows in my package.json file, but I don’t see it in my node_modules folder. I am assuming that’s related to the issue. What did I do wrong here?

*Note: I know that this is a GIS-related package but the issue is a generic NodeJS package issue, not a GIS-specific one.