/**
 * Formats a number as currency.
 *
 * @param number - The number to format. It can be a number, bigint, or string.
 * @param currency - The currency symbol or code (optional).
 * @param maximumFractionDigits - The maximum number of decimal places to display (optional).
 * @param hideCurrency - Determines whether to hide the currency symbol (default: true).
 * @returns The formatted currency string.
 */
export declare const formatCurrency: (number: number | bigint | string, currency?: string, maximumFractionDigits?: number, hideCurrency?: boolean) => string;