import type { Guard } from '../utils/types.js';
/**
 * Check if a value is a non-empty string.
 */
export declare function isNonEmptyString(value: unknown): value is string;
/**
 * Check if a value is a string matching an email pattern.
 */
export declare function isEmail(value: unknown): value is string;
/**
 * Check if a value is a valid URL string.
 */
export declare function isURL(value: unknown): value is string;
/**
 * Check if a value is a valid UUID (v1-v5).
 */
export declare function isUUID(value: unknown): value is string;
/**
 * Check if a value is a valid ISO 8601 date string.
 */
export declare function isISO8601(value: unknown): value is string;
/**
 * Check if a value is a valid JSON string.
 */
export declare function isJSONString(value: unknown): value is string;
/**
 * Check if a value is a string matching a hex color (#fff or #ffffff).
 */
export declare function isHexColor(value: unknown): value is string;
/**
 * Check if a value is a positive number (> 0).
 */
export declare function isPositiveNumber(value: unknown): value is number;
/**
 * Check if a value is a negative number (< 0).
 */
export declare function isNegativeNumber(value: unknown): value is number;
/**
 * Check if a value is an integer.
 */
export declare function isInteger(value: unknown): value is number;
/**
 * Check if a value is a safe integer (within Number.MAX_SAFE_INTEGER bounds).
 */
export declare function isSafeInteger(value: unknown): value is number;
/**
 * Check if a value is a non-empty array.
 */
export declare function isNonEmptyArray<T = unknown>(value: unknown): value is [T, ...T[]];
/**
 * Create a guard that checks if a number is within a range [min, max].
 *
 * @example
 * ```ts
 * const isPercent = isInRange(0, 100);
 * isPercent(50)   // true
 * isPercent(150)  // false
 * ```
 */
export declare function isInRange(min: number, max: number): Guard<number>;
/**
 * Create a guard that checks if a value is one of the specified values.
 *
 * @example
 * ```ts
 * const isDirection = isOneOf(['up', 'down', 'left', 'right'] as const);
 * if (isDirection(input)) {
 *   // input is 'up' | 'down' | 'left' | 'right'
 * }
 * ```
 */
export declare function isOneOf<T extends readonly unknown[]>(values: T): Guard<T[number]>;
/**
 * Create a guard that checks if a string matches a pattern.
 *
 * @example
 * ```ts
 * const isSlug = isMatch(/^[a-z0-9-]+$/);
 * isSlug("hello-world") // true
 * isSlug("Hello World") // false
 * ```
 */
export declare function isMatch(pattern: RegExp): Guard<string>;
/**
 * Create a guard that checks if a string has a minimum length.
 */
export declare function isMinLength(min: number): Guard<string>;
/**
 * Create a guard that checks if a string has a maximum length.
 */
export declare function isMaxLength(max: number): Guard<string>;
/**
 * Check if a value is an instance of a given class.
 *
 * @example
 * ```ts
 * const isMyError = isInstanceOf(TypeError);
 * ```
 */
export declare function isInstanceOf<T>(constructor: new (...args: unknown[]) => T): Guard<T>;
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