import '../augmentations';
import type { GraphileConfig } from 'graphile-config';
/**
 * ConnectionFilterBackwardRelationsPlugin
 *
 * Adds backward relation filter fields to table filter types.
 * A "backward" relation is one where another table has a FK referencing the current table.
 *
 * For unique backward relations (one-to-one), a single filter field is added:
 * ```graphql
 * allClients(where: {
 *   profileByClientId: { bio: { includes: "engineer" } }
 * }) { ... }
 * ```
 *
 * For non-unique backward relations (one-to-many), a "many" filter type is added
 * with `some`, `every`, and `none` sub-fields:
 * ```graphql
 * allClients(where: {
 *   ordersByClientId: { some: { total: { greaterThan: 1000 } } }
 * }) { ... }
 * ```
 *
 * The SQL generated uses EXISTS subqueries:
 * ```sql
 * WHERE EXISTS (
 *   SELECT 1 FROM orders
 *   WHERE orders.client_id = clients.id
 *   AND <nested filter conditions>
 * )
 * ```
 */
export declare const ConnectionFilterBackwardRelationsPlugin: GraphileConfig.Plugin;