import type { Plugin } from './app';
/** Options for the {@link etag} plugin. */
export interface EtagOptions {
    /** Request methods that receive an ETag (compared case-insensitively). Default `["GET"]`. */
    methods?: string[];
}
/**
 * Plugin: add a weak `ETag` to cacheable responses and answer `304 Not Modified`
 * when the client's `If-None-Match` matches — so an unchanged body costs a hash
 * and an empty response instead of re-sending it. Applies to `200` responses of
 * the configured methods (GET by default); other statuses are left untouched.
 *
 * ```ts
 * const app = await createApp({ plugins: [etag()] })
 * // GET /x → 200 + ETag; repeat with If-None-Match → 304
 * ```
 *
 * The body is buffered to hash it, so pair it with GET endpoints rather than
 * large streaming responses.
 *
 * @param options - which request methods receive an ETag (default `GET`)
 * @returns a plugin that adds weak ETags and answers `304 Not Modified`
 */
export declare function etag(options?: EtagOptions): Plugin;
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