/**
 * Adds separators to a string representing a number.
 *
 * @param str - The string representation of the number.
 * @param groupSize - The primary grouping size for grouping digits in the integer part.
 * @param groupSeparator - The character used as the grouping separator in the integer part.
 * @param decimalSeparator - The character used as the decimal separator.
 * @returns The string representation of the number with separators added.
 */
export declare const addSeparators: (str: string, { groupSize, groupSeparator, decimalSeparator, }: {
    groupSize: number;
    groupSeparator: string;
    decimalSeparator: string;
}) => string;
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