import { IncomingMessage, ServerResponse } from 'http';
import { CompressionResult } from '../types';
export declare function acceptsGzip(req: IncomingMessage): boolean;
export declare function compressBuffer(buffer: Buffer, level?: number): Promise<Buffer>;
export declare function compressIfNeeded(content: Buffer, mimeType: string, threshold?: number, level?: number): Promise<CompressionResult | null>;
export declare function setCompressionHeaders(res: ServerResponse, compressionResult: CompressionResult | null, etag: string, lastModified: string, mimeType: string): void;
export declare function shouldServeCompressed(req: IncomingMessage, compressionResult: CompressionResult | null): boolean;
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