//#region src/coordinates/latlon/internal/normalize.d.ts
type Format = 'LATLON' | 'LONLAT';
type CoordinateInternalValue = {
  LAT: number;
  LON: number;
};
/** Tuple in `[latitude, longitude]` order. */
type LatLonTuple = readonly [latitude: number, longitude: number];
/** Tuple in `[longitude, latitude]` order (GeoJSON convention). */
type LonLatTuple = readonly [longitude: number, latitude: number];
/** A coordinate tuple in either lat/lon or lon/lat order. */
type CoordinateTuple = LatLonTuple | LonLatTuple;
/**
 * Object representation of a coordinate with explicit lat/lon keys.
 * Accepts objects with case-insensitive variations: lat/LAT/latitude/LATITUDE and lon/LON/longitude/LONGITUDE.
 * Runtime validation via `isCoordinateObject` ensures proper keys are present.
 *
 * @example
 * ```typescript
 * { lat: 40.7128, lon: -74.0060 }
 * { latitude: 40.7128, longitude: -74.0060 }
 * { LAT: 40.7128, LON: -74.0060 }
 * ```
 */
type CoordinateObject = Record<string, number>;
type CoordinateInput = string | CoordinateTuple | CoordinateObject;
declare function isCoordinateTuple(input: CoordinateInput): input is CoordinateTuple;
declare function isCoordinateObject(input: CoordinateInput): input is CoordinateObject;
/**
 * Normalizes a coordinate object to a consistent lat/lon format.
 *
 * Accepts coordinate objects with case-insensitive key variations (lat/LAT/latitude/LATITUDE
 * and lon/LON/longitude/LONGITUDE) and returns a normalized object with lowercase 'lat' and 'lon' keys.
 * Returns null if required keys are not found.
 *
 * @param obj - Coordinate object with lat/lon keys (case-insensitive)
 * @returns Normalized object with lat and lon keys, or null if invalid
 *
 * @example
 * ```typescript
 * normalizeObjectToLatLon({ lat: 40.7128, lon: -74.0060 });
 * // => { lat: 40.7128, lon: -74.0060 }
 * ```
 *
 * @example
 * ```typescript
 * normalizeObjectToLatLon({ LATITUDE: 40.7128, LONGITUDE: -74.0060 });
 * // => { lat: 40.7128, lon: -74.0060 }
 * ```
 *
 * @example
 * ```typescript
 * normalizeObjectToLatLon({ x: 10, y: 20 });
 * // => null (missing required keys)
 * ```
 */
declare function normalizeObjectToLatLon(obj: CoordinateObject): {
  lat: number;
  lon: number;
} | null;
declare function tupleToLatLon(format: Format, tuple: CoordinateTuple): {
  lat: number;
  lon: number;
};
//#endregion
export { CoordinateInput, CoordinateInternalValue, CoordinateObject, CoordinateTuple, LatLonTuple, LonLatTuple, isCoordinateObject, isCoordinateTuple, normalizeObjectToLatLon, tupleToLatLon };
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