import { ChainScoped, DataResponse } from "../../model/response.js";
import "../../model/index.js";
import { MergeListResult } from "./types.js";
//#region src/sdk/utils/mergeChains.d.ts
/**
 * How many seconds the backend may lag the chain and still be used.
 **/
export declare const DEFAULT_MAX_OFFCHAIN_LAG = 120;
/**
 * Merges two lists chain by chain: a chain is served by the backend when it is
 * within `maxLagSeconds` of the chain, by the chain otherwise, and reported as
 * an error when neither source succeeded. Answers with an envelope as soon as
 * either side has arrived, see {@link MergeListResult}.
 **/
export declare function mergeChainList<T extends ChainScoped, Onchain extends DataResponse<T[]> | undefined, Offchain extends DataResponse<T[]> | undefined>(onchain: Onchain, offchain: Offchain, maxLagSeconds?: number): MergeListResult<Onchain, Offchain, T[]>;
/**
 * Merges two versions of one entity under the same freshness rule as
 * {@link mergeChainList}, returning the winning response whole.
 **/
export declare function mergeChainOne<T>(onchain: DataResponse<T> | undefined, offchain: DataResponse<T> | undefined, maxLagSeconds?: number): DataResponse<T> | undefined;
//#endregion