/**
 * Tree-shakeable, type-based validator functions for EDS form controls.
 * Implements standard HTML5 constraint validation rules per the EDS specification.
 */
/**
 * Validates whether the value satisfies required constraint.
 */
export declare function validateRequired(value: string | null | undefined): boolean;
/**
 * Validates an email address.
 */
export declare function validateEmail(value: string): boolean;
/**
 * Validates a URL address with standard protocol (http, https, ftp).
 * Supports standard domains, localhost, IP addresses, and custom ports.
 */
export declare function validateUrl(value: string): boolean;
/**
 * Validates telephone numbers (permissive standard allowing international and formatted phone numbers).
 */
export declare function validateTel(value: string): boolean;
/**
 * Validates number value against min, max, and step boundaries.
 */
export declare function validateNumber(value: string | number, constraints?: {
    min?: number;
    max?: number;
    step?: number;
}): {
    valid: boolean;
    rangeUnderflow?: boolean;
    rangeOverflow?: boolean;
    stepMismatch?: boolean;
};
/**
 * Validates text against a regex pattern.
 */
export declare function validatePattern(value: string, pattern: string): boolean;
/**
 * Validates text length against minlength and maxlength.
 */
export declare function validateLength(value: string, minlength?: number, maxlength?: number): {
    valid: boolean;
    tooShort?: boolean;
    tooLong?: boolean;
};
export interface ValidationResult {
    valid: boolean;
    flags: ValidityStateFlags;
    validationMessage: string;
}
/**
 * Comprehensive constraint validator for eds-input.
 */
export declare function validateInputConstraints(value: string, options: {
    type?: string;
    required?: boolean;
    pattern?: string;
    min?: number;
    max?: number;
    step?: number;
    minlength?: number;
    maxlength?: number;
    lang?: string;
}): ValidationResult;
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