import { SyncAdapter, SyncResult, ConflictStrategy, ColumnDef } from './sync-adapter.js';
export interface SyncMeta {
    table: string;
    lastPushAt: string | null;
    lastPullAt: string | null;
    lastSyncCursor: string | null;
}
export interface SyncChange {
    id?: number;
    table: string;
    recordId: string;
    action: 'create' | 'update' | 'delete';
    data: any;
    timestamp: string;
    synced: boolean;
}
export interface SyncOptions {
    strategy?: ConflictStrategy;
    batchSize?: number;
    onProgress?: (message: string) => void;
    /**
     * Explicit user-column schema. When provided, used as the source of truth
     * (merged with sync meta columns) and passed to adapter.ensureTable().
     * If omitted, columns are inferred from pending records.
     */
    columns?: ColumnDef[];
}
export declare class SyncEngine {
    private db;
    private syncUser;
    setDatabase(db: IDBDatabase): void;
    setUser(userId: string): void;
    getUser(): string | null;
    private getSyncMeta;
    private setSyncMeta;
    private getPendingChanges;
    private getAllChanges;
    private markChangesSynced;
    private pruneSyncedChanges;
    sync(table: string, adapter: SyncAdapter, options?: SyncOptions): Promise<SyncResult>;
    private deriveColumns;
    pushChanges(table: string, adapter: SyncAdapter): Promise<SyncResult>;
    pullChanges(table: string, adapter: SyncAdapter): Promise<any[]>;
    mergeChanges(table: string, remoteRecords: any[], adapter: SyncAdapter, strategy: ConflictStrategy): Promise<SyncResult>;
    private mergeSingleRecord;
    getPendingCount(table: string): Promise<number>;
    clearSyncData(table: string): Promise<void>;
}
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