import type { UUID, UUIDVersion } from '../hash/types';
/**
 * * Type guard to check if a value is a valid email string.
 * @param value - The value to check.
 * @returns `true` if the value is a valid email, otherwise `false`.
 */
export declare function isEmail(value: unknown): value is string;
/**
 * * Type guard to check if a value is an array of valid email strings.
 * @param value - The value to check.
 * @returns `true` if the value is an array of valid email strings, otherwise `false`.
 */
export declare function isEmailArray(value: unknown): value is string[];
/**
 * * Type guard to check if a value is a valid date string.
 * @param value - The value to check.
 * @returns `true` if the value is a valid date string, otherwise `false`.
 */
export declare function isDateString(value: unknown): value is string;
/**
 * * Type guard to check if a value is a valid UUID (`RFC4122` `v1`-`v8`).
 * @param value - The value to check.
 * @returns `true` if the value matches standard UUID pattern, otherwise `false`.
 */
export declare function isUUID(value: unknown): value is UUID<UUIDVersion>;
/**
 * * Type guard to check if the code is running in a browser environment.
 * @returns `true` if the code is running in a browser, otherwise `false`.
 */
export declare function isBrowser(): boolean;
/**
 * * Type guard to check if the code is running in a Node.js environment.
 * @returns `true` if the code is running in Node.js, otherwise `false`.
 */
export declare function isNode(): boolean;
/**
 * * Type guard to check if a value is a valid URL.
 * @param value - The value to check.
 * @returns `true` if the value is a valid URL, otherwise `false`.
 */
export declare function isURL(value: unknown): value is string;
/**
 * * Type guard to check if a value is a valid Base64 encoded string.
 * @param value - The value to check.
 * @returns `true` if the value is a valid Base64 string, otherwise `false`.
 */
export declare function isBase64(value: unknown): value is string;
/**
 * * Type guard to check if a value is a valid hexadecimal byte sequence.
 * @param value - The value to check, spaced between bytes or un-spaced.
 * @returns `true` if the value is a valid hexadecimal byte sequence, otherwise `false`.
 */
export declare function isHexString(value: unknown): value is string;
/**
 * * Type guard to check if a value is a valid binary byte sequence.
 * @param value - The value to check, spaced between bytes or un-spaced.
 * @returns `true` if the value is a valid binary byte sequence, otherwise `false`.
 */
export declare function isBinaryString(value: unknown): value is string;
/**
 * * Type guard to check if a value is a valid phone number.
 * @param value - The value to check.
 * @returns `true` if the value is a valid phone number, otherwise `false`.
 */
export declare function isPhoneNumber(value: unknown): value is string;
/**
 * * Type guard to check if a value is a valid IP address (IPv4 or IPv6).
 * @param value - The value to check.
 * @returns `true` if the value is a valid IP address, otherwise `false`.
 */
export declare function isIPAddress(value: unknown): value is string;
/**
 * * Type guard to check if the current environment matches a given string.
 * @param env - The expected environment (e.g., "production", "development").
 * @returns `true` if the value equals to `process.env.NODE_ENV`, otherwise `false`.
 */
export declare function isEnvironment(env: string): boolean;
/**
 * * Type guard to check if a value is a string representing a finite number.
 *
 * @remarks
 * - Accepts strings like: `"42"`, `"  -5.5 "`, `"0.123"`, `"-0"`, `"1e5"`.
 * - Rejects strings like: `"NaN"`, `"Infinity"`, `"-Infinity"`, `"abc"`, `""`, `"42abc"`.
 *
 * @param value - The value to test.
 * @returns `true` if the value is a string that fully represents a finite number.
 */
export declare function isNumericString(value: unknown): value is `${number}`;