LaneListView.swift

struct LaneListView: View {
    @StateObject var viewModel: ViewModel
    
    var body: some View {
        List {
            ForEach(viewModel.lanes) { lane in
                LaneRowView(lane: lane)
            }
        }
        .frame(minWidth: 200, minHeight: 200)
    }

    final class ViewModel: ObservableObject {
        let lanes: [Lane]
        
        init(document: FastfileDocument) {
            lanes = document.lanes()
        }
    }
}