import { JsonRpcProvider } from 'ethers';
import { CoinAmount, Native } from '../../types';
/**
 * Fetch the current gas price estimate. Supports both EIP-1559 and non-EIP1559 chains
 * @param {JsonRpcProvider} provider - The JSON RPC provider used to fetch fee data
 * @param {Native} nativeToken - The native token of the chain. Gas prices will be denominated in this token
 * @returns {CoinAmount<Native> | null} - The gas price in the smallest denomination of the chain's currency,
 *  or null if no gas price is available
 */
export declare const fetchGasPrice: (provider: JsonRpcProvider, nativeToken: Native) => Promise<CoinAmount<Native> | null>;
/**
 * Calculate the gas fee from the gas price and gas units used for the transaction
 *
 * @param {CoinAmount<Native>} gasPrice - The price of gas
 * @param {BigNumber} gasEstimate - The total gas units that will be used for the transaction
 * @returns - The cost of the transaction in the gas token's smallest denomination (e.g. WEI)
 */
export declare const calculateGasFee: (hasSecondaryFees: boolean, gasPrice: CoinAmount<Native>, gasEstimate: bigint) => CoinAmount<Native>;