/**
 * Check if given is a string representing a `CronMonthValueNumber`.
 *
 * @category Predicates
 * @example
 * ```typescript
 * isStringMonthValueNumber("10"); // true
 * isStringMonthValueNumber("50"); // false
 * ```
 * @param value Value to check.
 * @returns Returns `true` if is a string representing a `CronMonthValueNumber`, `false` otherwise.
 */
export declare const isStringMonthValueNumber: (
	value: unknown,
) => value is string;