/**
 * Sync state tracking for auto-sync feature.
 * Stored in .dex/sync-state.json
 */
export interface SyncState {
    /** ISO timestamp of last successful sync */
    lastSync: string | null;
}
/**
 * Get sync state from .dex/sync-state.json
 * Returns default state if file doesn't exist.
 */
export declare function getSyncState(storagePath: string): SyncState;
/**
 * Update sync state after successful sync.
 * Creates the file if it doesn't exist.
 */
export declare function updateSyncState(storagePath: string, state: Partial<SyncState>): void;
/**
 * Parse duration string to milliseconds.
 * Supports: "30s", "5m", "1h", "1d"
 * @returns milliseconds, or null if invalid format
 */
export declare function parseDuration(duration: string): number | null;
/**
 * Check if sync is stale based on max_age.
 * Returns true if last sync exceeds max_age or if never synced.
 * Returns false if max_age is invalid.
 */
export declare function isSyncStale(storagePath: string, maxAge: string): boolean;
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