answers the burning question: "Is an OSM element an area?"
An OpenSreetMap area must be a way or a relation. But not just any way or relation.
If you are not so fortunate that all your elements are nodes, look further...
osm_is_area::way
According to Overpass turbo, a way is considered an area if
area=no
use osm_is_area;
let tags = vec![
(r"waterway", r"riverbank")
];
let refs = vec![1, 3, 2, 1];
let is_area = osm_is_area::way(&tags, &refs);
assert_eq!(true, is_area);
osm_is_area::relation
A relation is an area when it has a tag "type" with value "multipolygon".
use osm_is_area;
let tags = vec![
(r"type", r"multipolygon")
];
let members = vec![1, 3, 2, 1];
let is_area = osm_is_area::relation(&tags, &members);
assert_eq!(true, is_area);
MIT