/**
 * Converts Celsius to Fahrenheit.
 * @param celsius - The temperature in Celsius.
 * @returns The temperature in Fahrenheit.
 */
export declare function celsiusToFahrenheit(celsius: number): number;
/**
 * Converts Fahrenheit to Celsius.
 * @param fahrenheit - The temperature in Fahrenheit.
 * @returns The temperature in Celsius.
 */
export declare function fahrenheitToCelsius(fahrenheit: number): number;
/**
 * Converts miles to kilometers.
 * @param miles - The distance in miles.
 * @returns The distance in kilometers.
 */
export declare function milesToKilometers(miles: number): number;
/**
 * Converts kilometers to miles.
 * @param kilometers - The distance in kilometers.
 * @returns The distance in miles.
 */
export declare function kilometersToMiles(kilometers: number): number;
/**
 * Converts pounds to kilograms.
 * @param pounds - The weight in pounds.
 * @returns The weight in kilograms.
 */
export declare function poundsToKilograms(pounds: number): number;
/**
 * Converts kilograms to pounds.
 * @param kilograms - The weight in kilograms.
 * @returns The weight in pounds.
 */
export declare function kilogramsToPounds(kilograms: number): number;
/**
 * Converts seconds to minutes.
 * @param seconds - The time in seconds.
 * @returns The time in minutes.
 */
export declare function secondsToMinutes(seconds: number): number;
/**
 * Converts minutes to seconds.
 * @param minutes - The time in minutes.
 * @returns The time in seconds.
 */
export declare function minutesToSeconds(minutes: number): number;
/**
 * Converts currency from one to another based on an exchange rate.
 * @param amount - The amount of currency to convert.
 * @param exchangeRate - The exchange rate from the source to the target currency.
 * @returns The converted amount of currency.
 */
export declare function convertCurrency(amount: number, exchangeRate: number): number;
/**
 * Formats a currency value with a currency code and symbol.
 * @param amount - The amount of currency.
 * @param currencyCode - The currency code (e.g., 'USD', 'INR').
 * @param locale - The locale for formatting (e.g., 'en-US', 'en-IN').
 * @returns The formatted currency string.
 */
export declare function formatCurrency(amount: number, currencyCode: string, locale?: string): string;