import type { H3Event } from 'h3';
/**
 * Verify the request has a valid Authorization: Bearer token.
 * Throws 401 if the token is missing or invalid.
 * No-op if runtimeSyncSecret is not configured.
 *
 * Also accepts the deprecated `?secret=` query param with a warning.
 */
export declare function requireAuth(event: H3Event): void;