import type { FastifyInstance } from "fastify";
/** Whether any entry in an `If-None-Match` header matches. The header is a comma-separated list,
 * and `*` matches any existing representation (RFC 9110 §13.1.2). */
export declare function ifNoneMatchSatisfied(header: string | undefined, etag: string): boolean;
/**
 * Content-derived `ETag` on every successful GET, and a 304 when the client already has it.
 *
 * Derived from the response body rather than from the graph's `resolvedAt`, and that is the whole
 * design. `resolvedAt` changes on every reload — every `--watch` trigger, every `POST /reload`,
 * every SIGHUP — including the overwhelmingly common reload where a document was touched and
 * nothing a given endpoint returns actually changed. A timestamp validator would invalidate every
 * client's cache on every reload, which is the same as having no validator. Hashing the body means
 * the org graph can be re-resolved a hundred times and `/teams` keeps the same ETag until `/teams`
 * genuinely differs.
 *
 * What this saves is the network, not the computation: the payload is still built before it is
 * hashed. That is the right trade here — building it is pure in-memory work over an already
 * resolved graph, while `/graph` on a large org is megabytes over the wire, repeatedly, to
 * dashboards and CI jobs polling for changes.
 *
 * Registered as an `onSend` hook rather than per route, so a route added later is covered by
 * existing rather than by remembering.
 */
export declare function registerEtag(app: FastifyInstance): void;
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