/**
 * @module ValidationRules
 * Form validation rules for use with FormValidator.
 * Provides declarative validation through decorators.
 *
 * Validation messages use the i18n system. Load the 'r-validation' namespace
 * for localized error messages:
 *
 * @example
 * await loadNamespace('r-validation');
 *
 * @example
 * // In HTML, use validation attributes
 * <input name="age" data-validate="required range(0-120)" />
 */
/**
 * Context provided to validators during validation.
 */
export interface ValidationContext {
    /** The HTML input type (text, number, email, etc.) */
    inputType: string;
    /** The data-type attribute value if present */
    dataType?: string;
    /** Adds an error message to the validation result */
    addError(message: string): void;
}
/**
 * Interface for custom validators.
 */
interface Validator {
    /**
     * Validates the given value.
     * @param value - The string value to validate
     * @param context - Validation context with type info and error reporting
     */
    validate(value: string, context: ValidationContext): void;
}
interface ValidatorRegistryEntry {
    validator: {
        new (): Validator;
    };
    validInputTypes: string[];
}
/**
 * Decorator to register a validator class for a specific validation name.
 *
 * @param validationName - The name used in data-validate attribute
 * @param validInputTypes - Optional list of input types this validator applies to
 *
 * @example
 * @RegisterValidator('email')
 * class EmailValidation implements Validator {
 *     validate(value: string, context: ValidationContext) {
 *         if (!value.includes('@')) {
 *             context.addError('Invalid email address');
 *         }
 *     }
 * }
 */
export declare function RegisterValidator(validationName: string, validInputTypes?: string[]): (target: {
    new (...args: unknown[]): Validator;
}) => void;
/**
 * Looks up a registered validator by name.
 *
 * @param name - The validator name used in `data-validate`
 * @returns The registry entry, or `undefined` if not found
 */
export declare function getValidator(name: string): ValidatorRegistryEntry | undefined;
/**
 * Validates that a field has a non-empty value.
 * Use with `data-validate="required"`.
 */
export declare class RequiredValidation implements Validator {
    static create(rule: string): RequiredValidation | null;
    validate(value: string, context: ValidationContext): void;
    getMessage(): string;
}
/**
 * Validates that a numeric value falls within a specified range.
 * Use with `data-validate="range(min-max)"`.
 *
 * @example
 * <input name="age" type="number" data-validate="range(0-120)" />
 */
export declare class RangeValidation implements Validator {
    min: number;
    max: number;
    constructor(min: number, max: number);
    static create(rule: string): RangeValidation | null;
    validate(value: string, context: ValidationContext): void;
    getMessage(actual: string): string;
}
/**
 * Validates that a value contains only numeric digits (0-9).
 * Use with `data-validate="digits"`.
 */
export declare class DigitsValidation implements Validator {
    static create(rule: string): DigitsValidation | null;
    validate(value: string, context: ValidationContext): void;
    getMessage(): string;
}
export {};