import type { TTabs } from '../TTabs.svelte';
/**
 * Custom error type for layout validation
 */
export declare class LayoutValidationError extends Error {
    code: string;
    constructor(message: string, code: string);
}
/**
 * Function type for layout validators
 * @param ttabs The ttabs instance to validate
 * @returns true if layout is valid, throws LayoutValidationError otherwise
 */
export type LayoutValidator = (ttabs: TTabs) => boolean;
/**
 * Type for validation error handlers
 */
export type ValidationErrorHandler = (error: LayoutValidationError) => void;
/**
 * Interface for the validation middleware
 */
export interface ValidationMiddleware {
    /**
     * Array of validator functions to run
     */
    validators: LayoutValidator[];
    /**
     * Default layout creator function
     */
    defaultLayoutCreator?: (ttabs: TTabs) => void;
    /**
     * Error handlers
     */
    errorHandlers: ValidationErrorHandler[];
    /**
     * Run all validators
     * @param ttabs The ttabs instance to validate
     * @returns true if layout is valid, false otherwise
     */
    validate(ttabs: TTabs): boolean;
    /**
     * Reset to default layout
     * @param ttabs The ttabs instance to reset
     */
    resetToDefault(ttabs: TTabs): void;
    /**
     * Add error handler
     * @param handler The error handler to add
     */
    addErrorHandler(handler: ValidationErrorHandler): void;
}