import type { Dnum } from 'dnum';
/**
 * Compute a gas cost estimate in wei as an 18-decimal Dnum.
 *
 * @param gasPriceWei - Current gas price in wei (e.g. from `getGasPrice`)
 * @param gasUnits - Conservative gas-unit buffer reserved for the checkout tx
 * @returns Gas estimate as a Dnum: [gasUnits * gasPriceWei, 18]
 */
export declare function getGasEstimateWei(gasPriceWei: bigint, gasUnits: bigint): Dnum;