import * as Web3 from 'web3';
export declare class Web3Utils {
    static soliditySHA3(...payload: any[]): string;
    private web3;
    constructor(web3: Web3);
    getNetworkIdAsync(): Promise<number>;
    getAvailableAddressesAsync(): Promise<string[]>;
    doesContractExistAtAddressAsync(address: string): Promise<boolean>;
}