import type { PostgresRelationship } from "../types.ts";
import type { Queryable } from "./index.ts";
/**
 * Port of `postgres-meta/src/lib/PostgresMetaRelationships.ts`.
 *
 * The relationships used for type generation come in two parts:
 *  1. table↔table m2o/o2o relationships, read directly from `pg_constraint`
 *     (`TABLE_RELATIONSHIPS_SQL`); and
 *  2. relationships that involve a view on either side, which PostgREST derives
 *     by mapping a base table's foreign key columns onto the view columns that
 *     select them (`VIEWS_KEY_DEPENDENCIES_SQL` + the cartesian-product
 *     expansion below). This second part is pure TypeScript, not SQL — ported
 *     verbatim from upstream.
 *
 * Adapted from:
 * https://github.com/PostgREST/postgrest/blob/f9f0f79fa914ac00c11fbf7f4c558e14821e67e2/src/PostgREST/SchemaCache.hs#L392
 */
type ColDep = {
    table_column: string;
    view_columns: string[];
};
export type ViewKeyDependency = {
    table_schema: string;
    table_name: string;
    view_schema: string;
    view_name: string;
    constraint_name: string;
    constraint_type: "f" | "f_ref" | "p" | "p_ref";
    column_dependencies: ColDep[];
};
/**
 * Expand the table↔table relationships into the view↔table / table↔view /
 * view↔view relationships implied by the view key dependencies. Pure function
 * (no database) so the cartesian-product expansion can be unit-tested directly.
 *
 * Ported verbatim from `PostgresMetaRelationships.list()` (the body of the
 * `allViewM2oAndO2oRelationships` block).
 */
export declare function expandViewRelationships(allTableM2oAndO2oRelationships: PostgresRelationship[], viewsKeyDependencies: ViewKeyDependency[]): PostgresRelationship[];
/**
 * List all relationships (table↔table plus the view-derived ones) for the
 * schemas selected by `schemaFilter`, the `IN (…)`/`NOT IN (…)` fragment
 * `introspect()` builds with the system schemas excluded. Errors from the
 * injected `Queryable` propagate by throwing — callers adapt.
 */
export declare function listRelationships(db: Queryable, schemaFilter: string): Promise<PostgresRelationship[]>;
export {};