import 'graphile-build';
import 'graphile-build-pg';
import type { GraphileConfig } from 'graphile-config';
import '../types';
/**
 * PostgisAggregatePlugin
 *
 * Registers PostGIS aggregate functions as GraphQL aggregate fields.
 *
 * Supported aggregates:
 * - `stExtent`: ST_Extent — bounding box of all geometries (returns GeoJSON Polygon)
 * - `stUnion`: ST_Union — union/merge of all geometries (returns GeoJSON)
 * - `stCollect`: ST_Collect — collect into GeometryCollection (returns GeoJSON)
 * - `stConvexHull`: ST_ConvexHull(ST_Collect) — convex hull of all geometries (returns GeoJSON Polygon)
 *
 * These are added as fields on aggregate types (e.g. RestaurantsAggregates)
 * for geometry/geography columns. They use SQL-level aggregation.
 *
 * Integration: The plugin hooks into PostGraphile's aggregate type system
 * via the GraphQLObjectType_fields hook, detecting aggregate scope and
 * adding PostGIS-specific aggregate fields.
 */
export declare const PostgisAggregatePlugin: GraphileConfig.Plugin;