import { type GeoJsonGeometry, type GeoJsonPosition } from "@trackunit/geo-json-utils";
/**
 * Computed properties injected into `sourceProperties` for all edge-* anchors.
 * Render functions read these from the `item` argument via portal descriptors.
 */
export type EdgeComputedProperties = Readonly<{
    /** Screen-space angle of the edge in degrees, normalized to [-90, 90]. */
    angleDeg: number;
    /** Which side of the edge faces away from the shape interior. "above" for LineStrings. */
    outwardSide: "above" | "below";
    /** Length of the edge in screen pixels at the current zoom level. */
    edgePixelLength: number;
}>;
/**
 * Compute edge-specific properties from resolved edge endpoints.
 *
 * For Polygons, `outwardSide` uses the cross product with the geometry centroid
 * to determine which side faces away from the interior. For LineStrings (no
 * interior), `outwardSide` defaults to `"above"`.
 *
 * When `geodesic` is `true`, `angleDeg` is derived from the arc tangent at
 * the edge midpoint (t = 0.5) via finite difference, so decorations are
 * rotated correctly relative to the visible curved edge.
 */
export declare const computeEdgeProperties: (start: GeoJsonPosition, end: GeoJsonPosition, geometry: GeoJsonGeometry, zoom: number, tileSize: number, geodesic?: boolean) => EdgeComputedProperties;