/**
 * PostgreSQL Document Store - Shared Helpers
 *
 * Utilities for document collection tools: identifier validation,
 * filter parsing, collection existence checks, and table reference escaping.
 */
import type { PostgresAdapter } from "../../postgres-adapter.js";
export declare const IDENTIFIER_RE: RegExp;
export declare const JSON_PATH_RE: RegExp;
/**
 * Parse filter string into a WHERE clause with parameterized queries.
 * Supports:
 * - _id match: 32-char hex string → WHERE _id = $1
 * - JSON object: {"name":"Alice"} → WHERE doc->>'name' = $1
 * - Field equality: name=Alice → WHERE doc->>'name' = $1
 * - JSON path existence: $.name → WHERE doc ? 'name'
 */
export declare function parseDocFilter(filter: string, paramOffset?: number): {
    where: string;
    params: unknown[];
};
/**
 * Check if a collection (table with doc JSONB + _id column) exists.
 * Returns a discriminated result distinguishing schema-not-found from collection-not-found.
 */
export declare function checkCollectionExists(adapter: PostgresAdapter, collection: string, schema?: string): Promise<{
    exists: true;
} | {
    exists: false;
    reason: "schema" | "collection";
    name: string;
}>;
/**
 * Build a double-quoted PostgreSQL table reference.
 */
export declare function escapeTableRef(name: string, schema?: string): string;
//# sourceMappingURL=helpers.d.ts.map