import type { EIP1193Parameters, Hex, HttpTransportConfig, PublicRpcSchema, RequiredBy } from "viem";
import type { ILogger } from "../sdk/index.js";
import type { RpcResponse } from "./types.js";
export type EthCallMethod = Extract<PublicRpcSchema[number], {
    Method: "eth_call";
}>;
export type EthCallRequest = EIP1193Parameters<[EthCallMethod]>;
export interface DetectedCall {
    request: EthCallRequest;
    response?: RpcResponse<Hex>;
    responseHeaders?: Record<string, string>;
}
export type CheckMulticallFn = (data: EthCallRequest) => boolean;
/**
 * Helper to spy on eth_call requests and responses in viem transport
 */
export declare class EthCallSpy<TCall extends DetectedCall = DetectedCall> {
    #private;
    enabled: boolean;
    constructor(check: CheckMulticallFn, logger?: ILogger, enabled?: boolean);
    onFetchRequest: Required<HttpTransportConfig>["onFetchRequest"];
    onFetchResponse: Required<HttpTransportConfig>["onFetchResponse"];
    get detectedCalls(): TCall[];
    get detectedBlock(): bigint;
    protected storeRequest(blockNumber: bigint, data: EthCallRequest): void;
    protected storeResponse(_call: RequiredBy<TCall, "response" | "responseHeaders">): void | Promise<void>;
}