Unknown property result_type using the Reverse Geocoding JavaScript API

I was trying to use the Google Maps Reverse Geocoding (translating a location on the map into a human-readable address) via the JavaScript API, and I wanted to filter the results to get only the street addresses.

As I saw in the docs, there is a result_type optional parameter for this request, but when specifying it, I get the following error:

InvalidValueError: unknown property result_type

I include the API by loading this script: https://maps.googleapis.com/maps/api/js?key=MY_API_KEY

And here is the code I use for reverse geocoding:

geocoder = new google.maps.Geocoder();
geocoder.geocode(
    {
        location: {lat: parseFloat(lat), lng: parseFloat(lng)},
        result_type: 'street_address'
    },
    function(results, status) {
        if (status === 'OK') {
            console.log(results);
        }
    }
);

A small playground fiddle: https://jsfiddle.net/scebotari66/30nshzb6/.

However, when I try this via a direct HTTP request (https://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&result_type=street_address&key=MY_API_KEY), everything works as expected.