/**
 *
 * @param {string|number} gasUsed
 * @param {string|number} gasLimit
 * @returns {Object}
 */
export declare function calculateGasUsage(gasUsed: string | number | undefined, gasLimit: string | number | undefined): {
    percentage: number;
    category: 'low' | 'medium' | 'high';
};
/**
 *
 * @param {string|number} gasPrice
 * @param {number} decimals
 * @returns {string}
 */
export declare function formatGasToGwei(gasPrice: string | number | undefined, decimals?: number): string;