import { Request } from '../transport/request.js';
import { HttpResponse, RequestHandler } from '../types.js';
/**
 * Request handler that validates and serializes request bodies based on content type.
 * Supports JSON, XML, text, binary, form data, and multipart form data.
 */
export declare class RequestValidationHandler implements RequestHandler {
    /** Next handler in the chain */
    next?: RequestHandler;
    /**
     * Handles a standard HTTP request with validation.
     * @template T - The expected response data type
     * @param request - The HTTP request to validate
     * @returns A promise that resolves to the HTTP response
     * @throws Error if no next handler is set
     */
    handle<T>(request: Request): Promise<HttpResponse<T>>;
    /**
     * Handles a streaming HTTP request with validation.
     * @template T - The expected response data type for each chunk
     * @param request - The HTTP request to validate
     * @returns An async generator that yields HTTP responses
     * @throws Error if no next handler is set
     */
    stream<T>(request: Request): AsyncGenerator<HttpResponse<T>>;
    /**
     * Validates and serializes the request body based on its content type.
     * @param request - The HTTP request to validate
     * @throws ValidationError if Zod schema validation fails
     */
    validateRequest(request: Request): void;
    /**
     * Converts request body to URL-encoded form data format.
     * @param request - The HTTP request with body to convert
     * @returns URL-encoded string representation of the body
     */
    toFormUrlEncoded(request: Request): string;
    /**
     * Converts request body to multipart form data format.
     * Handles files (ArrayBuffer), arrays, and regular values.
     * @param body - The request body object
     * @param filename - Optional filename for single file uploads
     * @param filenames - Optional filenames array for array of file uploads
     * @returns FormData object with serialized body
     */
    toFormData(body: Record<string, any>, filename?: string, filenames?: string[]): FormData;
}
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