I am utilizing the Geolocation API to place a marker on a map, but ESLint is complaining that GeolocationPosition is undefined. Nevertheless, the code runs and gives me the expected result, but I want to clean my code for warnings. I am new to typescript and ESlint, so I am unsure where to go from here. Any suggestions? Code and image of warning follows.

import { Map } from 'leaflet';
import { iconLocation, setMarker } from './leafletMarker';

export function getUserPosition(callback : (position : GeolocationPosition) => void) {
    function success(position : GeolocationPosition) {
        callback(position);
    }
    function error() {
        console.log('Unable to retrieve your location'); // change to alerts when Alert component is ready
    }
    if (!navigator.geolocation) {
        console.log('Geolocation is not supported by your browser'); // change to alerts when Alert component is ready
    } else {
        navigator.geolocation.getCurrentPosition(success, error, { enableHighAccuracy: true });
    }
}

export function handleMyPosition(map: Map) {
    getUserPosition((userPosition: GeolocationPosition) => {
        if (map) {
            const { latitude, longitude } = userPosition.coords;
            setMarker(map, latitude, longitude, { icon: iconLocation });
            map?.setView([latitude, longitude], 9);
        }
    });
}