/**
 * Shared HTTP compression helpers used by the framework adapters. Handles
 * `Accept-Encoding` negotiation and maps a chosen encoding to a ZipKit codec.
 */
/** HTTP content codings ZipKit can emit, best-ratio first. */
export type Encoding = 'br' | 'zstd' | 'gzip' | 'deflate';
/** Default server preference order (highest ratio first). */
export declare const DEFAULT_ENCODINGS: Encoding[];
export interface CompressionOptions {
    /**
     * Encodings the server is willing to emit, in preference order. The first
     * one the client also accepts wins. Defaults to `['br','zstd','gzip','deflate']`.
     */
    encodings?: Encoding[];
    /** Don't compress responses smaller than this many bytes. Default `1024`. */
    threshold?: number;
    /** Compression level passed to the chosen codec. */
    level?: number;
}
/**
 * Pick the best mutually-supported encoding from an `Accept-Encoding` header,
 * or `null` if none match (or the client sent `identity;q=0`-style refusals).
 */
export declare function negotiate(acceptEncoding: string | null | undefined, encodings?: Encoding[]): Encoding | null;
/** Compress a response body for the negotiated `encoding`. */
export declare function compressBody(body: Uint8Array, encoding: Encoding, level?: number): Promise<Uint8Array>;
/** Coerce common body shapes into bytes. */
export declare function toBytes(body: unknown): Uint8Array | null;
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