import { QueryHookPlugin, QueryExecutionContext } from '../index';
/**
 * Options for PerformanceMonitorPlugin
 */
export interface PerformanceMonitorOptions {
    /**
     * Threshold in milliseconds for slow query detection (default: 500)
     */
    slowQueryThreshold?: number;
    /**
     * Callback when a slow query is detected
     */
    onSlowQuery?: (context: QueryExecutionContext) => void;
    /**
     * Callback for all query completions (for custom metrics)
     */
    onMetric?: (context: QueryExecutionContext) => void;
    /**
     * Enable console logging for this plugin (default: false)
     * When true, the plugin will log query completions, slow queries, and errors to console
     */
    enableLogging?: boolean;
}
/**
 * Plugin for monitoring query performance
 * Tracks execution time and detects slow queries
 *
 * @example
 * ```typescript
 * import { enableQueryHooks, registerPlugin } from 'typeorm-query-hooks';
 * import { PerformanceMonitorPlugin } from 'typeorm-query-hooks/plugins/performance-monitor';
 *
 * enableQueryHooks();
 *
 * registerPlugin(PerformanceMonitorPlugin({
 *   slowQueryThreshold: 300,  // custom threshold (default: 500ms)
 *   enableLogging: true,      // log to console (default: false)
 *   onSlowQuery: (context) => {
 *     console.warn(`Slow query detected: ${context.executionTime}ms`, {
 *       sql: context.sql.substring(0, 200)
 *     });
 *   }
 * }));
 * ```
 */
export declare function PerformanceMonitorPlugin(options?: PerformanceMonitorOptions): QueryHookPlugin;
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