import { Middleware } from 'koa';
import { FSWatcher } from 'chokidar';
export interface WatchServedFilesMiddlewareConfig {
    rootDir: string;
    fileWatcher: FSWatcher;
}
/**
 * Sets up a middleware which tracks served files and sends a reload message to any
 * active browsers when any of the files change.
 */
export declare function createWatchServedFilesMiddleware(cfg: WatchServedFilesMiddlewareConfig): Middleware;