/**
 * Synchronisation with Solana Blockchain
 *
 * Implements Section 9 of the TOSS Technical Paper:
 * Upon regaining connectivity, devices initiate reconciliation with onchain state.
 * All offline artifacts are verified onchain and settled with deterministic outcomes.
 *
 * GAP #2 FIX: Track synchronization state persistently
 */
import { Connection, PublicKey } from '@solana/web3.js';
import { type SettlementResult, type ReconciliationState } from './reconciliation';
export interface SyncResult {
    successfulSettlements: SettlementResult[];
    failedSettlements: SettlementResult[];
    detectedConflicts: {
        intentId: string;
        conflict: string;
    }[];
    reconciliationState: ReconciliationState;
    syncTimestamp: number;
    isComplete: boolean;
}
/**
 * Full sync and reconciliation with the Solana blockchain
 *
 * This is the primary function for TOSS settlement. When a device regains
 * connectivity, it calls this to:
 * 1. Detect any conflicts with onchain state
 * 2. Settle all pending intents
 * 3. Update local state with results
 *
 * GAP #2 FIX: Persist reconciliation state for future queries
 *
 * @param connection Connection to Solana RPC
 * @param userId User ID for state tracking (required for persistence)
 * @param feePayer Optional fee payer keypair public key
 * @returns Detailed sync results including conflicts and settlements
 */
export declare function syncToChain(connection: Connection, userId?: string, feePayer?: PublicKey): Promise<SyncResult>;
/**
 * Lightweight sync to check status without settling
 * Useful for monitoring or UI updates without committing to settlements
 */
export declare function checkSyncStatus(connection: Connection): Promise<ReconciliationState>;
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