interface RailSegmentProps {
    variant: "top" | "mid" | "bottom";
    gap: readonly [number, number];
}
/** Vertical rail of a node row, interrupted around the node. "top" starts below the node,
 * "bottom" stops above it, "mid" runs through with a gap. */
export declare const RailSegment: ({ variant, gap }: RailSegmentProps) => import("@emotion/react/jsx-runtime").JSX.Element;
/** Empty stretch of rail — adds vertical breathing room while the line runs through. */
export declare const RailSpacer: ({ height }: {
    height: number;
}) => import("@emotion/react/jsx-runtime").JSX.Element;
export {};