import { PrefixedHexString } from 'ethereumjs-tx';
import PingResponse from '../PingResponse';
import RelayRequest from '../EIP712/RelayRequest';
import GsnTransactionDetails from './GsnTransactionDetails';
import RelayFailureInfo from './RelayFailureInfo';
import { RelayRegisteredEventInfo } from './RelayRegisteredEventInfo';
import { HttpProvider, IpcProvider, WebsocketProvider } from 'web3-core';
import { JsonRpcPayload, JsonRpcResponse } from 'web3-core-helpers';
export declare type Address = string;
export declare type IntString = string;
export declare type SemVerString = string;
/**
 * For legacy reasons, to filter out the relay this filter has to throw.
 * TODO: make ping filtering sane!
 */
export declare type PingFilter = (pingResponse: PingResponse, gsnTransactionDetails: GsnTransactionDetails) => void;
export declare type AsyncDataCallback = (relayRequest: RelayRequest) => Promise<PrefixedHexString>;
export declare type RelayFilter = (registeredEventInfo: RelayRegisteredEventInfo) => boolean;
export declare type AsyncScoreCalculator = (relay: RelayRegisteredEventInfo, txDetails: GsnTransactionDetails, failures: RelayFailureInfo[]) => Promise<number>;
export declare function notNull<TValue>(value: TValue | null | undefined): value is TValue;
/**
 * This is an intersection of NPM log levels and 'loglevel' library methods.
 */
export declare type NpmLogLevel = 'error' | 'warn' | 'info' | 'debug';
export declare type Web3Provider = HttpProvider | IpcProvider | WebsocketProvider;
/**
 * The only thing that is guaranteed a Web3 provider or a similar object is a {@link send} method.
 */
export interface Web3ProviderBaseInterface {
    send: (payload: JsonRpcPayload, callback: (error: Error | null, result?: JsonRpcResponse) => void) => void;
}