import type { Extensions } from "./extensions.js";
import type { HeaderMap } from "./headers.js";
import type { HttpResponse } from "./response.js";
/**
 * Parts of a response.
 *
 * @see {@link ToHttpResponseParts}.
 */
export declare class HttpResponseParts {
    private readonly res;
    constructor(res: HttpResponse);
    get headers(): HeaderMap;
    get extensions(): Extensions;
}
export declare const TO_HTTP_RESPONSE_PARTS: unique symbol;
/**
 * Determines if a given value implements `ToHttpResponseParts`.
 */
export declare const isToHttpResponseParts: (value: unknown) => value is ToHttpResponseParts;
/**
 * Interface for adding headers and extensions to a response.
 */
export type ToHttpResponseParts = {
    /**
     * Sets parts of the response.
     */
    [TO_HTTP_RESPONSE_PARTS](res: HttpResponseParts): void;
};