import { FastifyPluginAsync, FastifyPluginCallback } from 'fastify';
import { SwaggerOptions } from '@fastify/swagger';
export interface OpenApiGeneratorOptions {
    apiDefinition: FastifyPluginAsync | FastifyPluginCallback;
    swaggerOptions?: SwaggerOptions;
    prefix?: string;
    outputDirectory?: string;
}
/**
 * Generates OpenAPI JSON and YAML spec documents based on a given Fastify API plugin with optional
 * Swagger definitions.
 */
export declare function generateOpenApiSpec(options: OpenApiGeneratorOptions): Promise<void>;