import { IBlockchain } from '../../interfaces';
import { IBlockFetcher } from '../../interfaces';
import { BlockFetcherResult } from '../../types';
import { Loggable } from "../../lib/Loggable";
import { ILogger } from "../../interfaces/lib/ILogger";
import { IAlerts } from "../../interfaces/lib/IAlerts";
/**
 * The IBlockFetcher implementation for fetching a single block by height from the given blockchain.
 * This class is blockchain-agnostic and only requires that the given blockchain is an implementation of IBlockchain.
 */
export declare class BlockFetcher extends Loggable implements IBlockFetcher {
    protected blockchain: IBlockchain;
    /**
     * @param {IBlockchain} blockchain
     * @param {ILogger} logger property used for delegation of routing logs
     * @param {IAlerts} alerts property used for delegation of sending alerts
     */
    constructor(blockchain: IBlockchain, logger?: ILogger, alerts?: IAlerts);
    /**
     * Fetches the block, if it exists, for the given height by calling the blockchain member's getBlockByHeight method.
     * @param height height of desired block
     */
    apply(height: number): Promise<BlockFetcherResult>;
}