/**
 * Diagnostic data collection for `weft doctor`.
 *
 * Inspects storage to gather database health, workflow statistics,
 * and queue statistics, then generates actionable recommendations.
 *
 * @module diagnostics/doctor
 */
import type { Storage } from '../storage/interface.ts';
import type { DiagnosticReport } from './types.ts';
/**
 * Collect diagnostics from a Weft storage instance.
 *
 * Gathers database health, workflow statistics, and queue statistics,
 * then generates recommendations based on configurable thresholds.
 *
 * @example
 * ```ts
 * import { Engine, MemoryStorage, collectDiagnostics } from '@lostgradient/weft';
 *
 * await using storage = new MemoryStorage();
 * const report = await collectDiagnostics(storage, ':memory:');
 * console.log(report.workflows.total);
 * console.log(report.recommendations.length);
 * ```
 */
export declare function collectDiagnostics(storage: Storage, databasePath: string, options?: {
    now?: number;
    sizeLimitBytes?: number;
}): Promise<DiagnosticReport>;