Resolver for out-of-band style-ref bodies. Returns the per-layer override map keyed by MapLibre layer id. The default loader assumes inline bodies attached to the package and calls this resolver only when the inline body is absent.
Optional
Resolver for out-of-band style-ref bodies. Returns the per-layer override map keyed by MapLibre layer id. The default loader assumes inline bodies attached to the package and calls this resolver only when the inline body is absent.