/**
 * Component reachability: which `components` entries a document still needs,
 * and pruning the ones it does not.
 *
 * `fastify-type-provider-zod`'s `jsonSchemaTransformObject` writes *every*
 * schema of the Zod registry into `components.schemas` in a single pass over
 * the finished document, with no knowledge of which routes the route-level
 * transform hid. Without pruning, the public document carries the request and
 * response shapes of internal endpoints, and both `@scalar/fastify-api-reference`
 * and `@fastify/swagger-ui` render them in their models panel.
 */
/**
 * Minimal structural view of an OpenAPI document. Deliberately loose: the
 * filtering below only needs `paths`, `tags` and `components`, and typing the
 * rest would force a dependency on `openapi-types`.
 */
export type OpenApiDocumentLike = {
    paths?: Record<string, Record<string, unknown> | undefined>;
    tags?: Array<{
        name?: string;
    } & Record<string, unknown>>;
    components?: {
        schemas?: Record<string, unknown>;
    } & Record<string, unknown>;
} & Record<string, unknown>;
/**
 * Drop every `components` entry the document no longer references.
 *
 * Reachability follows `$ref`s transitively, so an entry referenced only by
 * another kept entry survives. `components.securitySchemes` is never pruned:
 * security schemes are referenced by name from `security` requirements rather
 * than by `$ref`.
 *
 * Skip this if the document deliberately publishes a schema catalogue beyond
 * what its operations reference: pruning is exactly what you do not want then.
 *
 * The input document is never mutated.
 *
 * The type parameter is deliberately unconstrained. `openapi-types`' `Document`
 * interfaces have no index signatures, so they do not structurally satisfy
 * {@link OpenApiDocumentLike} even though they are exactly what this is for,
 * and constraining it would reject `app.swagger()`, the one argument that
 * matters. The document is inspected defensively at runtime instead.
 */
export declare function pruneUnreachableComponents<Document>(document: Document): Document;