/**
 * NestJS integration for typeorm-query-hooks
 *
 * This module provides utilities for integrating the query hooks
 * with NestJS dependency injection and TypeORM Logger
 */
import { Logger as TypeOrmLogger } from 'typeorm';
/**
 * Abstract base class for TypeORM Logger with table extraction support
 * Extend this in your NestJS service to get automatic table extraction
 */
export declare abstract class BaseQueryLogger implements TypeOrmLogger {
    /**
     * Get tables from a SQL query using the metadata registry
     * This works for queries that went through QueryBuilder
     * @param query - Raw SQL string
     * @returns Array of table names
     */
    protected getTablesFromQuery(query: string): string[];
    /**
     * Check if metadata is available for this query
     * @param query - Raw SQL string
     * @returns true if metadata was captured from QueryBuilder
     */
    protected hasMetadata(query: string): boolean;
    /**
     * Get first table name (useful for metrics)
     * @param query - Raw SQL string
     * @returns First table name or 'unknown'
     */
    protected getPrimaryTable(query: string): string;
    abstract logQuery(query: string, parameters?: any[]): void;
    abstract logQueryError(error: string | Error, query: string, parameters?: any[]): void;
    abstract logQuerySlow(time: number, query: string, parameters?: any[]): void;
    abstract logSchemaBuild(message: string): void;
    abstract logMigration(message: string): void;
    abstract log(level: 'log' | 'info' | 'warn', message: any): void;
}
/**
 * Utility class that can be injected into any NestJS service
 * Provides table extraction without needing to extend BaseQueryLogger
 */
export declare class QueryMetadataService {
    /**
     * Get tables from a SQL query
     * @param query - Raw SQL string
     * @returns Array of table names
     */
    getTablesFromQuery(query: string): string[];
    /**
     * Check if metadata is available
     * @param query - Raw SQL string
     */
    hasMetadata(query: string): boolean;
    /**
     * Get first table name
     * @param query - Raw SQL string
     */
    getPrimaryTable(query: string): string;
    /**
     * Get all tables with count
     * @param query - Raw SQL string
     */
    getTableInfo(query: string): {
        tables: string[];
        count: number;
    };
}
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