/**
 * Validation utility functions
 */
/**
 * Validate email address
 */
export declare const isValidEmail: (email: string) => boolean;
/**
 * Validate URL
 */
export declare const isValidUrl: (url: string) => boolean;
/**
 * Validate required field
 */
export declare const isRequired: (value: string | number | boolean) => boolean;
/**
 * Validate minimum length
 */
export declare const hasMinLength: (value: string, minLength: number) => boolean;
/**
 * Validate maximum length
 */
export declare const hasMaxLength: (value: string, maxLength: number) => boolean;
/**
 * Validate number range
 */
export declare const isInRange: (value: number, min: number, max: number) => boolean;
/**
 * Validate phone number (basic US format)
 */
export declare const isValidPhoneNumber: (phone: string) => boolean;
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