/**
 * Pre-defined format specifiers for use with format().
 */
export declare enum NumberDisplayFormat {
    /**
     * A localized representation of a number with a decimal separator and group
     * separators (e.g. "12,345.67", "-42" for en-US locale).
     */
    NUMBER = "n",
    /**
     * A localized representation of a number with a decimal separator (e.g.
     * "12345.67", "-42" for en-US locale).
     */
    FIXED_POINT = "f",
    /**
     * A localized representation of a monetary amount in a specific currency
     * (e.g. "$123.45" for USD, "£123.45" for GBP for en-US locale).
     */
    CURRENCY = "c",
    /**
     * Same as CURRENCY, except that in many locales, negative values may be displayed in
     * parentheses instead of using a "-" sign.
     */
    ACCOUNTING = "a",
    /**
     * A localized representation of a percentage (e.g. 0.99 -\> "99%" in the
     * en-US locale).
     */
    PERCENT = "p",
    /**
     * An invariant representation of a number (e.g. "12345.67"). Guarantees
     * that the number can be parsed back into the same number, regardless of
     * locale.
     */
    ROUND_TRIP = "r",
    /**
     * A custom format string.
     */
    CUSTOM = "custom"
}
/**
 * Options supported by {@link format}.
 */
export interface FormatOptions {
    /**
     * See NumberFormat.currency.
     */
    currency?: string;
    /**
     * The custom number format. Required for a format type of 'Custom'
     */
    customDisplayFormat?: string;
    /**
     * The number format. See {@link NumberFormatter.format}.
     */
    format?: NumberDisplayFormat;
    /**
     * See NumberFormat.precision.
     */
    fractionalDigits?: number;
    /**
     * The locale to use when formatting the number.
     */
    locale: string;
}
export declare const DEFAULT_CURRENCY = "USD";
export declare const DEFAULT_CUSTOM_FORMAT = "#.##";
export declare const DEFAULT_FRACTIONAL_DIGITS = 4;
export declare const SUPPORTED_CURRENCIES: string[];
/**
 * Formats a number for display.
 *
 * @param options Specifies the format settings to use.
 * @param num The number to format.
 */
export declare function format(options: FormatOptions, num: number): string;