/**
 * Answering with bytes (SPEC.md §41).
 *
 * Routes are schema-first and answer with JSON, which is right for an API and wrong
 * for a file. A handler that has bytes returns them wrapped in this marker, and the
 * adapter sends them untouched instead of running them through a response schema.
 *
 * ```ts
 * route.get('/media/*', {
 *   handler: async ({ params }) => bytes(await storage.get(params.path), 'image/png'),
 * })
 * ```
 *
 * It stays an explicit, narrow escape hatch: the marker names no server library, so
 * a handler still never sees Fastify.
 */
export type BytesResponse = {
    readonly node: 'bytes';
    readonly body: Uint8Array;
    readonly contentType: string;
    readonly headers: Readonly<Record<string, string>>;
};
export declare const bytes: (body: Uint8Array, contentType: string, headers?: Readonly<Record<string, string>>) => BytesResponse;
export declare const isBytesResponse: (value: unknown) => value is BytesResponse;
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