import { type NanotronClientRequest } from '@alwatr/nanotron-api-server';
/**
 * Middleware to require a valid access token for a Nanotron API request.
 *
 * This function checks the authorization header for a Bearer token and compares it to the provided access token.
 * If the token is missing or invalid, it sends an appropriate error response and prevents further handlers from executing.
 *
 * @param {string} accessToken - The valid access token to compare against.
 * @returns {Function} A middleware function for Nanotron API requests.
 *
 * @example
 * ```ts
 * nanotronApiServer.defineRoute({
 *   method: 'POST',
 *   url: 'secure-endpoint',
 *   preHandlers: [requireAccessToken('mySecretToken')],
 *   async handler() {
 *     this.serverResponse.replyJson({
 *       ok: true,
 *       message: 'Access granted!',
 *     });
 *   },
 * });
 * ```
 */
export declare const requireAccessToken: (accessToken: string) => (this: NanotronClientRequest) => Promise<void>;
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