One thing that I find really useful in Swift is to use typealiases to reduce the length of method signatures in generic types:

public class PathFinder<Object: PathFinderObject> {
    public typealias Map = Object.Map
    public typealias Node = Map.Node
    public typealias Path = PathFinderPath<Object>
    
    public static func possiblePaths(
        for object: Object,
        at rootNode: Node,
        on map: Map
    ) -> Path.Sequence {
        return .init(object: object, rootNode: rootNode, map: map)
    }
}