import { NeedleOptions } from 'needle';
/** A conversion of currency. */
export interface CurrencyConversion {
    /** A timestamp of the last rate this conversion is based on. (i.e. 2021-04-18 16:00 GMT) */
    'rate-utc-timestamp': string;
    /** The amount of currency that will be converted. */
    'from-amount': string;
    /** The symbol of the currency being converted. (i.e. BRL) */
    'from-currency-symbol': string;
    /** The name of the currency being converted. (i.e. Brazil Reais) */
    'from-currency-name': string;
    /** The amount of currency converted. */
    'converted-amount': string;
    /** The symbol of the currency thats being converted into. (i.e. EUR) */
    'to-currency-symbol': string;
    /** The name of the currency thats being converted into. (i.e. Euro) */
    'to-currency-name': string;
    /** The rate of conversion in a string (i.e. 1 BRL = 0.149354 EUR) */
    'conversion-rate': string;
    /** The inverse rate of conversion in a string (i.e. 1 EUR = 6.69551 BRL) */
    'conversion-inverse': string;
}
/** An expanded conversion of currency. */
export interface CurrencyExpandedConversion extends CurrencyConversion {
    /** The frequency of the rate. */
    'rate-frequency': string;
}
/**
 * The result from the currency spice.
 */
export interface CurrencyResult {
    headers: {
        encoding: 'utf-8';
        language: string;
        'legal-warning': string;
        'help-notice': string;
        'utc-timestamp': string;
        status: '0' | '4' | '5';
        'output-format': 'json';
        description: string;
    };
    conversion: CurrencyExpandedConversion;
    topConversions: CurrencyConversion[];
}
/**
 * Get the currency conversion between two currencies.
 * Data provided by XE.
 * @category Spice
 * @see https://www.xe.com/
 * @param from The currency to convert from
 * @param to The currency to convert to
 * @param amount The amount of currency to convert
 * @param needleOptions The options for the HTTP request
 * @returns The currency result
 */
export declare function currency(from: string, to: string, amount?: number, needleOptions?: NeedleOptions): Promise<CurrencyResult>;