import type { Transform } from "node:stream";
export type Encoding = "br" | "gzip";
/** Responses smaller than this aren't worth the compression overhead. */
export declare const MIN_COMPRESS_BYTES = 1024;
/** Pick the best encoding the client accepts, preferring brotli. */
export declare function pickEncoding(acceptEncoding: string | undefined): Encoding | null;
export declare function isCompressibleExt(ext: string): boolean;
/** Streaming compressor for piping files. */
export declare function compressStream(enc: Encoding): Transform;
/** One-shot compressor for in-memory bodies (e.g. JSON). */
export declare function compressBuffer(enc: Encoding, buf: Buffer): Buffer;
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