/**
 * Check if any given value is a valid email address.
 */
export declare function isEmail(value: string): boolean;
/**
 * Check if any given value is a valid number.
 */
export declare function isNumber(value: unknown): boolean;
/**
 * Check if any given value is a valid URL.
 */
export declare function isUrl(value: string): boolean;
/**
 * Check if any given string, array or object is empty.
 */
export declare function isEmpty(value: string | string[] | number[] | object | null | undefined): boolean;
/**
 * Check if any given value is a valid UUID.
 */
export declare function isUuid(value: unknown): boolean;
/**
 * Check if any given value is a valid JSON string.
 */
export declare function isJson(value: unknown): boolean;
/**
 * Check if any given value is a plain object
 */
export declare function isObject(value: unknown): boolean;
/**
 * Check if any given value is an array.
 */
export declare function isArray(value: string[] | number[]): boolean;
/**
 * Check if any given value is a valid hexadecimal color code.
 */
export declare function isHex(value: string): boolean;
/**
 * Check if any given value contains only alphabetic characters.
 */
export declare function isAlphabetic(value: unknown): boolean;
/**
 * Check if any given value contains only alphanumeric characters.
 */
export declare function isAlphanumeric(value: unknown): boolean;
/**
 * Check if any given value is a boolean value.
 */
export declare function isBoolean(value: unknown): boolean;
/**
 * Check if any given value is undefined.
 */
export declare function isUndefined(value: unknown): boolean;
/**
 * Check if any given value is null.
 */
export declare function isNull(value: unknown): boolean;
/**
 * Check if any given value is a valid Date object.
 */
export declare function isDate(value: unknown): boolean;
/**
 * Check if any given value is a valid time in HH:mm format.
 */
export declare function isTime(value: unknown): boolean;
/**
 * Check if any given value year is a leap year.
 */
export declare function isLeapYear(value: number): boolean;
/**
 * Check if the number is even.
 */
export declare function isEven(value: number): boolean;
/**
 * Check if the number is odd.
 */
export declare function isOdd(value: number): boolean;
/**
 * Check if the number is positive.
 */
export declare function isPositive(value: number): boolean;
/**
 * Check if the number is negative.
 */
export declare function isNegative(value: number): boolean;
/**
 * Check if the number is zero.
 */
export declare function isZero(value: number): boolean;
/**
 * Check if the number is over 9000.
 */
export declare function isOver9000(value: number): boolean;
/**
 * Check if the number is a prime number.
 */
export declare function isPrime(value: number): boolean;
/**
 * Check if the number is an integer.
 */
export declare function isInteger(value: unknown): boolean;
/**
 * Check if the number is a float.
 */
export declare function isFloat(value: unknown): boolean;
/**
 * Check if the number is between the specified range.
 */
export declare function isBetween(value: number, min: number, max: number): boolean;
/**
 * Check if the number is divisible by the specified number.
 */
export declare function isDivisibleBy(value: number, divisor: number): boolean;
/**
 * Check if any given value is a valid credit card number.
 */
export declare function isCreditCard(value: unknown): boolean;
/**
 * Check if any given value is a valid latitude-longitude coordinate in the format lat,lng or lat,lng.
 */
export declare function isLatLng(value: string): boolean;
/**
 * Check if any given value is a valid latitude coordinate.
 */
export declare function isLatitude(value: string): boolean;
/**
 * Check if any given value is a valid longitude coordinate.
 */
export declare function isLongitude(value: string): boolean;
/**
 * Check if any given value is a valid IP address.
 */
export declare function isIpAddress(value: string): boolean;
/**
 * Check if any given value is a valid port number.
 */
export declare function isPort(value: number): boolean;
/**
 * Check if any given value is a valid MAC address.
 */
export declare function isMacAddress(value: string): boolean;