import BigNumber from 'bignumber.js';
export declare function calculateGasCost(gasLimit?: string | BigNumber, gasPrice?: string | BigNumber, decimal?: number): string;
export declare function calculateUSDollar(amount: string, rate: number, decimal?: number): string;
export declare function weiToGwei(amount: string | BigNumber, decimal?: number): string;
export declare function gweiToWei(amount: string | BigNumber, decimal?: number): string;
export declare function weiToEth(amount: string | BigNumber, decimal?: number): string;