tordans left a comment (openstreetmap/openstreetmap-website#6234)
> MapLibre GL JS has built-in support for GeoJSON overlays, so we only need a
> library for the conversion from that JSON format to GeoJSON, but not for the
> overlay classes themselves. I know of three such libraries: osmtogeojson,
> osm2geojson-lite, and osm2geojson-ultra.
Or, we find a way to do the conversion to GeoJSON on the source:
* For Overpass there is https://github.com/drolbr/Overpass-API/issues/761 but
there is also
https://github.com/drolbr/overpass-doc/blob/master/en/targets/formats.md which
explains how to transform the overpass JSON output with `convert item
::=::,::geom=geom(),_osm_type=type();`. We would have to test this against what
osm2geojson does, though.
* And for anything we server directly, something like a proxy in Rails that
does the transformation would work. There are/where projects like this already
https://blog.k-nut.eu/overpass-geojson-proxy and I think this would be a nice
but small addition to our service area (AKA services that we offer). It would,
hover, require us to find a shared way to define how what lines we consider an
area. I see that osm2geojson-ultra does this [in a static
file](https://github.com/dschep/osm2geojson-ultra/blob/main/src/polytags.json).
iD and OSMCha use a different approach, AFAIK both
https://github.com/ideditor/id-area-keys which is not updated ATM. Maybe we
should try to revitalize this projects?
(Thanks for pointing out `osm2geojson-ultra`, did not know about that, yet.)
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