/**
 * Time-Travel Debugging — view and compare project state at any point in time.
 */
import type { StoragePlugin } from './types.js';
export interface TimeSnapshot {
    target_date: number;
    target_date_iso: string;
    scope: string;
    observations: {
        total: number;
        by_type: Record<string, number>;
    };
    knowledge: {
        total: number;
        by_category: Record<string, number>;
    };
    events: {
        total: number;
        by_type: Record<string, number>;
    };
}
export interface TimeDelta {
    target_date: number;
    target_date_iso: string;
    current_date: number;
    knowledge: {
        added: number;
        total_then: number;
        total_now: number;
    };
    observations: {
        added: number;
        total_then: number;
        total_now: number;
    };
    events: {
        between: number;
        total_then: number;
        total_now: number;
        types_between: Record<string, number>;
    };
}
export declare class TimeTraveler {
    private storage;
    constructor(storage: StoragePlugin);
    /**
     * Parse a date string — supports ISO dates and relative expressions:
     *   "3 days ago", "2 hours ago", "last week", "yesterday", ISO 8601
     * Returns a unix timestamp (ms).
     */
    parseDate(input: string): number;
    /**
     * Build a snapshot of the project state at `targetDate`.
     * Scope can be "knowledge", "observations", "events", or "all".
     */
    snapshot(targetDate: number, scope?: string): TimeSnapshot;
    /**
     * Diff between two date strings — returns entry-level changes in knowledge,
     * observations by type, and events within the window.
     */
    diff(fromDate: string, toDate: string): {
        knowledge: {
            added: Array<{
                id: string;
                title: string;
                category: string;
                created_at: number;
            }>;
            archived: Array<{
                id: string;
                title: string;
                category: string;
            }>;
        };
        observations: {
            count: number;
            by_type: Record<string, number>;
        };
        events: Array<{
            event_type: string;
            count: number;
        }>;
    };
    /**
     * Compare the project state at `targetDate` with the current state.
     * Returns deltas: knowledge added, observation delta, events between.
     */
    compare(targetDate: number): TimeDelta;
}
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