/**
 * Formats a number according to the given mask.
 *
 * ```example
 * var formattedValue = format('+$#,##0.00', 12345.67);
 * console.log(formattedValue); // Output: +$12,345.67
 * ```
 *
 * @param {any} mask - The formatting mask to apply.
 * @param {any} value - The value to format.
 * @returns {string} - The formatted string.
 */
export declare function format(mask: string, value: number): string;