function vertexToLatLng(h3Index) {
    const latlng = C._malloc(SZ_LATLNG);
    const [lower, upper] = h3IndexToSplitLong(h3Index);
    try {
        throwIfError(H3.vertexToLatLng(lower, upper, latlng));
        return readLatLng(latlng);
    } finally {
        C._free(latlng);
    }
}
Get the lat, lng of a given vertex
@static
@param {H3IndexInput} h3Index A vertex index
@returns {CoordPair}          Latitude, longitude coordinates of the vertex
@throws {H3Error}             If the input is invalid