import { Request, Response, NextFunction } from 'express';
/**
 * Common validation middleware functions for request validation
 */
export declare class ValidationMiddleware {
    /**
     * Validates required fields in request body
     * @param requiredFields Array of required field names
     */
    static validateRequiredFields(requiredFields: string[]): (req: Request, res: Response, next: NextFunction) => Response<any, Record<string, any>> | undefined;
    /**
     * Validates field types in request body
     * @param fieldTypes Object mapping field names to expected types
     */
    static validateFieldTypes(fieldTypes: Record<string, 'string' | 'number' | 'boolean' | 'array' | 'object'>): (req: Request, res: Response, next: NextFunction) => Response<any, Record<string, any>> | undefined;
    /**
     * Validates string field length constraints
     * @param constraints Object mapping field names to min/max length
     */
    static validateStringLength(constraints: Record<string, {
        min?: number;
        max?: number;
    }>): (req: Request, res: Response, next: NextFunction) => Response<any, Record<string, any>> | undefined;
    /**
     * Validates email format
     * @param emailFields Array of field names that should contain valid emails
     */
    static validateEmailFormat(emailFields: string[]): (req: Request, res: Response, next: NextFunction) => Response<any, Record<string, any>> | undefined;
    /**
     * Validates UUIDs format
     * @param uuidFields Array of field names that should contain valid UUIDs
     */
    static validateUUIDFormat(uuidFields: string[]): (req: Request, res: Response, next: NextFunction) => Response<any, Record<string, any>> | undefined;
    /**
     * Validates numeric constraints
     * @param constraints Object mapping field names to min/max values
     */
    static validateNumericConstraints(constraints: Record<string, {
        min?: number;
        max?: number;
    }>): (req: Request, res: Response, next: NextFunction) => Response<any, Record<string, any>> | undefined;
    /**
     * Validates that arrays are not empty
     * @param arrayFields Array of field names that should contain non-empty arrays
     */
    static validateNonEmptyArrays(arrayFields: string[]): (req: Request, res: Response, next: NextFunction) => Response<any, Record<string, any>> | undefined;
    /**
     * Validates allowed values for enum-like fields
     * @param allowedValues Object mapping field names to arrays of allowed values
     */
    static validateAllowedValues(allowedValues: Record<string, any[]>): (req: Request, res: Response, next: NextFunction) => Response<any, Record<string, any>> | undefined;
    /**
     * Combines multiple validation middlewares
     * @param validations Array of validation middleware functions
     */
    static combine(validations: Array<(req: Request, res: Response, next: NextFunction) => void>): (req: Request, res: Response, next: NextFunction) => Promise<void>;
    /**
     * Helper method to get nested values from request
     * @param req Request object
     * @param path Dot-notation path like 'body.user.id'
     */
    private static getNestedValue;
}
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