import { Integer } from '@epdoc/typeutil';
/**
 * Returns the plural form of a word based on the given count.
 * @param {string} singular - The singular form of the word.
 * @param {Integer} n - The count of items.
 * @param {string} [plural] - The plural form of the word (optional).
 * @returns {string} The plural form of the word.
 */
export declare function plural(singular: string, n: Integer, plural?: string): string;
export declare enum Color {
    italic = 3,
    underline = 4,
    inverse = 7,
    black = 30,
    dark_red = 31,
    dark_green = 32,
    yellow = 33,
    dark_blue = 34,
    purple = 35,
    teal = 36,
    gray = 37,
    dark_gray = 90,
    red = 91,
    green = 92,
    orange = 93,
    blue = 94,
    magenta = 95,
    cyan = 96,
    white = 97
}
export declare function isValidColor(val: any): val is Integer;