/**
 * Pure geometry helpers for GroundTrackMapLeaflet.
 * Used for antimeridian splitting, geodesic circles, and world copies.
 * Longitudes are normalized to [-180, 180] where required.
 */
/** Normalize longitude to [-180, 180]. */
export declare function wrapLon(lon: number): number;
/** Normalize an array of [lat, lon] so all longitudes are in [-180, 180]. */
export declare function normalizeLatLngs(points: [number, number][]): [number, number][];
/**
 * Split a polyline at the antimeridian (±180°).
 * Input points should be normalized (wrapLon) so crossing is detected correctly.
 * No segment will contain consecutive points with |dLon| > 180 (avoids vertical line at date line).
 */
export declare function splitPolylineAtAntimeridian(points: [number, number][]): [number, number][][];
/** Return each segment plus world copies at lon ± 360. */
export declare function segmentsWithWorldCopies(segments: [number, number][][]): [number, number][][];
/** Geodesic circle as lat/lon polygon (for coverage that looks correct at all latitudes). */
export declare function geodesicCirclePoints(centerLat: number, centerLon: number, radiusDeg: number, numPoints?: number): [number, number][];
/**
 * Geodesic circle with continuous (unwrapped) longitudes.
 * All output longitudes stay within ±180° of centerLon, producing a single
 * clean polygon that never jumps across the antimeridian.
 * Leaflet renders out-of-range longitudes correctly, so no splitting is needed.
 */
export declare function geodesicCirclePointsContinuous(centerLat: number, centerLon: number, radiusDeg: number, numPoints?: number): [number, number][];
/**
 * Split a closed ring (e.g. geodesic circle) at ±180° so each part can be drawn without wrapping.
 * Returns one ring if the circle does not cross the date line, or two closed rings (east/west) if it does.
 */
export declare function splitRingAtAntimeridian(ring: [number, number][]): [number, number][][];