import { FastifyReply } from 'fastify';
/**
 * A `Cache-Control` header used for re-validation based caching.
 * * `public` == allow proxies/CDNs to cache as opposed to only local browsers.
 * * `no-cache` == clients can cache a resource but should revalidate each time before using it.
 * * `must-revalidate` == somewhat redundant directive to assert that cache must be revalidated, required by some CDNs
 */
export declare const CACHE_CONTROL_MUST_REVALIDATE = "public, no-cache, must-revalidate";
export declare function setResponseNonCacheable(reply: FastifyReply): Promise<void>;
/**
 * Parses the etag values from a raw `If-None-Match` request header value.
 * The wrapping double quotes (if any) and validation prefix (if any) are stripped.
 * The parsing is permissive to account for commonly non-spec-compliant clients, proxies, CDNs, etc.
 * E.g. the value:
 * ```js
 * `"a", W/"b", c,d,   "e", "f"`
 * ```
 * Would be parsed and returned as:
 * ```js
 * ['a', 'b', 'c', 'd', 'e', 'f']
 * ```
 * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-None-Match#syntax
 * ```
 * If-None-Match: "etag_value"
 * If-None-Match: "etag_value", "etag_value", ...
 * If-None-Match: *
 * ```
 * @param ifNoneMatchHeaderValue - raw header value
 * @returns an array of etag values
 */
export declare function parseIfNoneMatchHeader(ifNoneMatchHeaderValue: string | undefined): string[] | undefined;