/**
 * Color transition (lead gradients) between adjacent elements with different colors.
 *
 * When `colorTransition` is enabled, adjacent elements whose resolved colors differ
 * get `<linearGradient>` defs applied to their connecting lead segments, producing
 * a smooth color fade at the junction.
 */
import type { Element } from "./element.js";
import { Point } from "./geometry/point.js";
interface ConnectionEdge {
    elA: Element;
    elB: Element;
    colorA: string;
    colorB: string;
    /** The absolute point where the two elements meet. */
    junctionPt: Point;
}
/**
 * Find pairs of elements that share a connection point (any pin anchor within
 * tolerance) and have different resolved colors.
 *
 * Checks pin-level anchors (start, end, out, in1, in2, base, collector, etc.)
 * so connections via named pins on multi-terminal elements are detected.
 */
export declare function buildConnectionGraph(elements: readonly Element[]): ConnectionEdge[];
/**
 * Generate `<linearGradient>` defs for lead transition and assign `gradientStrokeId`
 * on the relevant `Segment` objects.
 *
 * @param scale SVG scale factor (`PT_PER_IN * inchesPerUnit`)
 */
export declare function assignLeadTransitionIds(elements: readonly Element[], edges: ConnectionEdge[], scale: number): {
    defsXml: string;
    cleanup: () => void;
};
export {};