/**
 * Calculates the total cost in wei for a given amount of gas.
 *
 * @param gasLimit - The amount of gas, represented as a bigint.
 * @param gasPrice - The price of gas in ETH, represented as a string.
 *                   It can contain more decimals than the specified precision.
 * @param decimals - The desired precision for the gas price. The gas price
 *                   will be truncated or rounded to this number of decimals.
 *
 * @returns The total cost in wei, represented as a bigint.
 *
 * @example
 * ```
 * const cost = gasToWei(BigInt(21000), "0.0000000001", 9);
 * console.log(cost);  // Expected output: some bigint value
 * ```
 */
export declare function gasToWei(gasLimit: bigint, gasPrice: string, decimals: number): bigint;
export declare function multiplyFloatByBigInt(floatNum: number, bigIntNum: bigint): bigint;