/**
 * Gets whether the value provided is null or undefined.
 * @param value The value to check.
 * @returns Whether the value provided is null or undefined.
 */
export declare function isNullOrUndefined(value: any): boolean;
/**
 * Gets whether the value provided is a natural number.
 * @param value The value to check.
 * @returns Whether the value provided is a natural number.
 */
export declare function isNaturalNumber(value: number): boolean;