export interface CacheControlOptions {
    /** Methods whose responses get the header. Default `["GET", "HEAD"]`. */
    readonly methods?: readonly string[];
    /** Predicate over the response status. Default: 2xx only. */
    readonly status?: (status: number) => boolean;
    /** When `true` (default), don't overwrite a `Cache-Control` the handler already set. */
    readonly respectExisting?: boolean;
}
/**
 * Set a `Cache-Control` header on matching responses. `value` is either a fixed directive string or a
 * function of the request (return `undefined` to leave a response untouched - e.g. cache by path).
 * Defaults to `GET`/`HEAD` + 2xx, and never clobbers a `Cache-Control` the handler set itself.
 *
 * ```ts
 * app.use(cacheControl("public, max-age=3600, stale-while-revalidate=60"))
 * // or per-path:
 * app.use(cacheControl((req) =>
 *   new URL(req.url).pathname.startsWith("/assets/") ? "public, max-age=31536000, immutable" : undefined,
 * ))
 * ```
 */
export declare function cacheControl(value: string | ((request: Request) => string | undefined), options?: CacheControlOptions): import("@nifrajs/core").IdentityPlugin<never>;
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