/**
 * GeoJSON conversion from S-101 dataset.
 *
 * Resolves feature geometry by following spatial record references.
 * Includes S-101-specific properties and S-57 OBJL mapping for
 * compatibility with existing S-52 renderers.
 */
import type { S101Dataset } from './types.js';
export interface GeoJSONFeatureCollection {
    type: 'FeatureCollection';
    features: GeoJSONFeature[];
}
export interface GeoJSONFeature {
    type: 'Feature';
    geometry: GeoJSONGeometry | null;
    properties: Record<string, unknown>;
}
export type GeoJSONGeometry = {
    type: 'Point';
    coordinates: [number, number];
} | {
    type: 'MultiPoint';
    coordinates: [number, number][];
} | {
    type: 'LineString';
    coordinates: [number, number][];
} | {
    type: 'Polygon';
    coordinates: [number, number][][];
} | {
    type: 'GeometryCollection';
    geometries: GeoJSONGeometry[];
};
/**
 * Convert an S-101 dataset to GeoJSON FeatureCollection.
 *
 * Properties include both S-101 feature type info and a mapped S-57 OBJL
 * code (when available) for rendering with S-52 symbology.
 */
export declare function toGeoJSON(dataset: S101Dataset, featureTypeFilter?: number[]): GeoJSONFeatureCollection;
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