import { IncomingHttpEvent } from '../IncomingHttpEvent.js';
import { NextMiddleware, type MetaMiddleware } from '@stone-js/core';
import { OutgoingHttpResponse } from '../OutgoingHttpResponse.js';
/**
 * Kernel Middleware to compress response content based on the Accept-Encoding header.
 */
export declare class CompressionMiddleware {
    /**
     * Compress the response content based on the Accept-Encoding header.
     *
     * @param event - The incoming HTTP event.
     * @param next - The next middleware in the pipeline.
     * @returns The outgoing HTTP response.
     */
    handle(event: IncomingHttpEvent, next: NextMiddleware<IncomingHttpEvent, OutgoingHttpResponse>): Promise<OutgoingHttpResponse>;
    /**
     * Determine the best compression format from the Accept-Encoding header.
     *
     * @param event - The incoming HTTP event.
     * @returns The best compression format to use.
     */
    private getCompressionFormatFromEvent;
    /**
     * Compress content using the specified encoding.
     *
     * @param content - The content to compress.
     * @param encoding - The encoding to use (gzip, deflate, br).
     * @returns The compressed content.
     */
    private compressContent;
    /**
     * Check if the content is compressible (string or Buffer).
     * Only compress Buffer content and string content that is larger than 1KB.
     *
     * @param content - The content to check.
     * @returns True if the content is compressible.
     */
    private isCompressibleContent;
}
/**
 * Meta Middleware for compressing response content.
 */
export declare const MetaCompressionMiddleware: MetaMiddleware;