import { FSWatcher } from 'chokidar';
/**
 * This watcher wraps chokidar so that we watch directories rather than individual files on macOS.
 * This prevents us from hitting EMFILE errors when running out of file descriptors.
 * Chokidar does not have support for watching directories on non-macOS platforms, so we disable
 * this behavior in order to prevent watching more individual files than necessary (e.g. node_modules).
 */
export default class Watcher {
    shouldWatchDirs: boolean;
    watcher: FSWatcher;
    watchedDirectories: Map<any, any>;
    stopped: boolean;
    constructor();
    /**
     * Find a parent directory of `path` which is already watched
     */
    getWatchedParent(path: string): string;
    /**
     * Find a list of child directories of `path` which are already watched
     */
    getWatchedChildren(path: string): any[];
    /**
     * Add a path to the watcher
     */
    watch(path: string): void;
    /**
     * Remove a path from the watcher
     */
    unwatch(path: string): void;
    /**
     * Add an event handler
     */
    on(event: string, callback: () => any): void;
    /**
     * Add an event handler
     */
    once(event: string, callback: () => any): void;
    /**
     * Stop watching all paths
     */
    stop(): void;
}