/**
 * CAN network flow helpers — virtual edges along the bus so packets can
 * travel ECU → bus rail → ECU (no pairwise wires in the static diagram).
 */
import type { App } from '../App';
import type { Group } from '../shapes/Group';
import type { Node } from '../Node';
import type { DiagramFlowHop } from './flow';
/** Distance from ECU card top to bus midline (matches createCanEcuNode tap). */
export declare const CAN_BUS_TAP = 18;
export declare function canBusHopPoints(from: Node, to: Node, busY: number): number[];
/**
 * Ensure an edge layer exists with bus-rail hop polylines for the given hops
 * (or all adjacent ECU pairs when hops omitted — for ambient bus traffic).
 */
export declare function ensureCanNetworkFlowEdges(app: App, root: Group, hops?: DiagramFlowHop[]): Group | undefined;