import type { Hono } from 'hono';
import type * as App from '../App.js';
/** Attaches a group's OpenAPI metadata to its app instance for `create` to collect on mount. */
export declare function attach<const app extends Hono<any, any>>(app: app, metadata: App.create.Metadata): app;
/** Reads the OpenAPI metadata attached to an app instance, if any. */
export declare function read(app: Hono<any, any>): App.create.Metadata | undefined;
/** Marks a group whose routes use the root app's default chain access policy. */
export declare function defaultChain<const app extends Hono<any, any>>(app: app): app;
/** Returns whether a group uses the root app's default chain access policy. */
export declare function usesDefaultChain(app: Hono<any, any>): boolean;
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