/**
 * @module component-koa-middleware
 *
 * A [Koa](https://koajs.com/) middleware allowing to serve a root [`Component`](https://layrjs.com/docs/v2/reference/component) so it can be accessed by a [`ComponentHTTPClient`](https://layrjs.com/docs/v2/reference/component-http-client).
 *
 * #### Usage
 *
 * Call the [`serveComponent()`](https://layrjs.com/docs/v2/reference/component-koa-middleware#serve-component-function) function to create a middleware for your Koa app.
 *
 * **Example:**
 *
 * ```
 * import Koa from 'koa';
 * import {Component} from '@layr/component';
 * import {serveComponent} from '@layr/component-koa-middleware';
 *
 * class Movie extends Component {
 *   // ...
 * }
 *
 * const app = new Koa();
 *
 * // Serve the `Movie` component at the root ('/')
 * app.use(serveComponent(Movie));
 *
 * app.listen(3210);
 * ```
 *
 * If you want to serve your component at a specific URL, you can use [`koa-mount`](https://github.com/koajs/mount):
 *
 * ```
 * import mount from 'koa-mount';
 *
 * // Serve the `Movie` component at a specific URL ('/api')
 * app.use(mount('/api', serveComponent(Movie)));
 * ```
 */
import type { Component } from '@layr/component';
import type { ComponentServer, ComponentServerOptions } from '@layr/component-server';
import type { Context } from 'koa';
export type ServeComponentOptions = ComponentServerOptions & {
    limit?: number | string;
    delay?: number;
    errorRate?: number;
};
/**
 * Creates a [Koa](https://koajs.com/) middleware exposing the specified root [`Component`](https://layrjs.com/docs/v2/reference/component) class.
 *
 * @param componentOrComponentServer The root [`Component`](https://layrjs.com/docs/v2/reference/component) class to serve. An instance of a [`ComponentServer`](https://layrjs.com/docs/v2/reference/component-server) will be created under the hood. Alternatively, you can pass an existing instance of a [`ComponentServer`](https://layrjs.com/docs/v2/reference/component-server).
 * @param [options.version] A number specifying the version of the created [`ComponentServer`](https://layrjs.com/docs/v2/reference/component-server) (default: `undefined`).
 *
 * @returns A Koa middleware.
 *
 * @category Functions
 */
export declare function serveComponent(componentOrComponentServer: typeof Component | ComponentServer, options?: ServeComponentOptions): (ctx: Context) => Promise<void>;