import type { Plugin } from './app';
/** Options for {@link compression}. */
export interface CompressionOptions {
    /** Minimum response size, in bytes, worth compressing; smaller bodies pass through untouched. Default 1024. */
    threshold?: number;
    /**
     * Extra `Content-Type` substrings to treat as compressible (matched with
     * `includes`), on top of the built-in `text/*`, JSON, JavaScript, and XML types.
     */
    types?: string[];
}
/**
 * Plugin: gzip-compress text-like responses when the client accepts it and the
 * body is worth compressing. Sets `Content-Encoding: gzip` and `Vary:
 * Accept-Encoding`; skips already-encoded, small, or non-text responses. The
 * body is buffered to compress it, so pair it with normal JSON/HTML responses
 * rather than large streams.
 *
 * ```ts
 * const app = await createApp({ plugins: [compression()] })
 * ```
 *
 * @param options - tune the size `threshold` and add compressible content
 *   `types`; defaults compress text/JSON/JavaScript/XML bodies of at least 1 KB
 * @returns a plugin whose interceptor gzips eligible responses
 */
export declare function compression(options?: CompressionOptions): Plugin;
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