/**
 * Gets a string with leading zero
 * @param num{Number} - source number
 * @param digits{Number=} - number of digits in target string
 * @return {string}
 * @example
 * // How to add a leading zero to a number?
 * const num = 9;
 * const withZero = getStrWithZeroFromNumber(9, 3);
 * console.log(withZero); // => "009"
 */
export function getStrWithZeroFromNum(num: number, digits?: number | undefined): string;
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