import { Chain } from '../../../../sdk';
import { ChaintracksClientApi } from '../Api/ChaintracksClientApi';
import { BlockHeader } from '../Api/BlockHeaderApi';
import { LiveIngestorBase, LiveIngestorBaseOptions } from './LiveIngestorBase';
export interface LiveIngestorChaintracksSSEOptions extends LiveIngestorBaseOptions {
    chaintracks: ChaintracksClientApi;
    /** Maximum number of remote events retained for local processing. Default: 4096. */
    maxQueuedHeaders?: number;
}
/**
 * Adapts a remote Chaintracks event stream, such as Arcade/go-chaintracks
 * `/chaintracks/v2/tip/stream`, into the local Chaintracks live-ingestor API.
 */
export declare class LiveIngestorChaintracksSSE extends LiveIngestorBase {
    private readonly options;
    static createLiveIngestorChaintracksSSEOptions(chain: Chain, chaintracks: ChaintracksClientApi): LiveIngestorChaintracksSSEOptions;
    private subscriptionId?;
    private stopped;
    private resolveStopped?;
    private readonly maxQueuedHeaders;
    private unsubscribePromise;
    constructor(options: LiveIngestorChaintracksSSEOptions);
    getHeaderByHash(hash: string): Promise<BlockHeader | undefined>;
    startListening(liveHeaders: BlockHeader[]): Promise<void>;
    stopListening(): void;
    shutdown(): Promise<void>;
    private queueUnsubscribe;
    private validateRemoteHeader;
}
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