/**
 * Regression Fingerprinting — capture "working state" snapshots at success events
 * and diff against current state when errors appear.
 */
import type { StoragePlugin } from './types.js';
export interface Fingerprint {
    knowledge_ids: string[];
    recent_files: string[];
    error_patterns_absent: string[];
    entity_state: string[];
    timestamp: number;
}
export interface RegressionDiff {
    added_errors: string[];
    changed_knowledge: string[];
    modified_files: string[];
    new_entities: string[];
    likely_causes: string[];
}
/**
 * Capture a snapshot of the current working state.
 */
export declare function captureFingerprint(storage: StoragePlugin, sessionId: string, trigger: string): Fingerprint;
/**
 * Diff current state against a baseline fingerprint.
 */
export declare function diffFingerprints(storage: StoragePlugin, baseline: Fingerprint): RegressionDiff;
/**
 * Get the most recent fingerprint for a session.
 */
export declare function getLastFingerprint(storage: StoragePlugin, sessionId?: string): Fingerprint | null;
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