import { Vector2 } from 'three';
export interface DirectedSegment {
    from: Vector2;
    to: Vector2;
}
/**
 * Determine whether line segments AB and CD intersect. (including end points)
 * @param ab line segment AB
 * @param cd line segment CD
 * @return True if two line segments intersect.
 */
export declare function intersectsDirectedSegment(ab: DirectedSegment, cd: DirectedSegment): boolean;