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diff --git a/node_modules/chokidar/LICENSE b/node_modules/chokidar/LICENSE
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+The MIT License (MIT)
+
+Copyright (c) 2012-2019 Paul Miller (https://paulmillr.com), Elan Shanker
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the “Software”), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/node_modules/chokidar/README.md b/node_modules/chokidar/README.md
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+# Chokidar [![Weekly downloads](https://img.shields.io/npm/dw/chokidar.svg)](https://github.com/paulmillr/chokidar) [![Yearly downloads](https://img.shields.io/npm/dy/chokidar.svg)](https://github.com/paulmillr/chokidar)
+
+> Minimal and efficient cross-platform file watching library
+
+[![NPM](https://nodei.co/npm/chokidar.png)](https://www.npmjs.com/package/chokidar)
+
+## Why?
+
+Node.js `fs.watch`:
+
+* Doesn't report filenames on MacOS.
+* Doesn't report events at all when using editors like Sublime on MacOS.
+* Often reports events twice.
+* Emits most changes as `rename`.
+* Does not provide an easy way to recursively watch file trees.
+* Does not support recursive watching on Linux.
+
+Node.js `fs.watchFile`:
+
+* Almost as bad at event handling.
+* Also does not provide any recursive watching.
+* Results in high CPU utilization.
+
+Chokidar resolves these problems.
+
+Initially made for **[Brunch](https://brunch.io/)** (an ultra-swift web app build tool), it is now used in
+[Microsoft's Visual Studio Code](https://github.com/microsoft/vscode),
+[gulp](https://github.com/gulpjs/gulp/),
+[karma](https://karma-runner.github.io/),
+[PM2](https://github.com/Unitech/PM2),
+[browserify](http://browserify.org/),
+[webpack](https://webpack.github.io/),
+[BrowserSync](https://www.browsersync.io/),
+and [many others](https://www.npmjs.com/browse/depended/chokidar).
+It has proven itself in production environments.
+
+Version 3 is out! Check out our blog post about it: [Chokidar 3: How to save 32TB of traffic every week](https://paulmillr.com/posts/chokidar-3-save-32tb-of-traffic/)
+
+## How?
+
+Chokidar does still rely on the Node.js core `fs` module, but when using
+`fs.watch` and `fs.watchFile` for watching, it normalizes the events it
+receives, often checking for truth by getting file stats and/or dir contents.
+
+On MacOS, chokidar by default uses a native extension exposing the Darwin
+`FSEvents` API. This provides very efficient recursive watching compared with
+implementations like `kqueue` available on most \*nix platforms. Chokidar still
+does have to do some work to normalize the events received that way as well.
+
+On most other platforms, the `fs.watch`-based implementation is the default, which
+avoids polling and keeps CPU usage down. Be advised that chokidar will initiate
+watchers recursively for everything within scope of the paths that have been
+specified, so be judicious about not wasting system resources by watching much
+more than needed.
+
+## Getting started
+
+Install with npm:
+
+```sh
+npm install chokidar
+```
+
+Then `require` and use it in your code:
+
+```javascript
+const chokidar = require('chokidar');
+
+// One-liner for current directory
+chokidar.watch('.').on('all', (event, path) => {
+  console.log(event, path);
+});
+```
+
+## API
+
+```javascript
+// Example of a more typical implementation structure
+
+// Initialize watcher.
+const watcher = chokidar.watch('file, dir, glob, or array', {
+  ignored: /(^|[\/\\])\../, // ignore dotfiles
+  persistent: true
+});
+
+// Something to use when events are received.
+const log = console.log.bind(console);
+// Add event listeners.
+watcher
+  .on('add', path => log(`File ${path} has been added`))
+  .on('change', path => log(`File ${path} has been changed`))
+  .on('unlink', path => log(`File ${path} has been removed`));
+
+// More possible events.
+watcher
+  .on('addDir', path => log(`Directory ${path} has been added`))
+  .on('unlinkDir', path => log(`Directory ${path} has been removed`))
+  .on('error', error => log(`Watcher error: ${error}`))
+  .on('ready', () => log('Initial scan complete. Ready for changes'))
+  .on('raw', (event, path, details) => { // internal
+    log('Raw event info:', event, path, details);
+  });
+
+// 'add', 'addDir' and 'change' events also receive stat() results as second
+// argument when available: https://nodejs.org/api/fs.html#fs_class_fs_stats
+watcher.on('change', (path, stats) => {
+  if (stats) console.log(`File ${path} changed size to ${stats.size}`);
+});
+
+// Watch new files.
+watcher.add('new-file');
+watcher.add(['new-file-2', 'new-file-3', '**/other-file*']);
+
+// Get list of actual paths being watched on the filesystem
+var watchedPaths = watcher.getWatched();
+
+// Un-watch some files.
+await watcher.unwatch('new-file*');
+
+// Stop watching.
+// The method is async!
+watcher.close().then(() => console.log('closed'));
+
+// Full list of options. See below for descriptions.
+// Do not use this example!
+chokidar.watch('file', {
+  persistent: true,
+
+  ignored: '*.txt',
+  ignoreInitial: false,
+  followSymlinks: true,
+  cwd: '.',
+  disableGlobbing: false,
+
+  usePolling: false,
+  interval: 100,
+  binaryInterval: 300,
+  alwaysStat: false,
+  depth: 99,
+  awaitWriteFinish: {
+    stabilityThreshold: 2000,
+    pollInterval: 100
+  },
+
+  ignorePermissionErrors: false,
+  atomic: true // or a custom 'atomicity delay', in milliseconds (default 100)
+});
+
+```
+
+`chokidar.watch(paths, [options])`
+
+* `paths` (string or array of strings). Paths to files, dirs to be watched
+recursively, or glob patterns.
+    - Note: globs must not contain windows separators (`\`),
+    because that's how they work by the standard —
+    you'll need to replace them with forward slashes (`/`).
+    - Note 2: for additional glob documentation, check out low-level
+    library: [picomatch](https://github.com/micromatch/picomatch).
+* `options` (object) Options object as defined below:
+
+#### Persistence
+
+* `persistent` (default: `true`). Indicates whether the process
+should continue to run as long as files are being watched. If set to
+`false` when using `fsevents` to watch, no more events will be emitted
+after `ready`, even if the process continues to run.
+
+#### Path filtering
+
+* `ignored` ([anymatch](https://github.com/es128/anymatch)-compatible definition)
+Defines files/paths to be ignored. The whole relative or absolute path is
+tested, not just filename. If a function with two arguments is provided, it
+gets called twice per path - once with a single argument (the path), second
+time with two arguments (the path and the
+[`fs.Stats`](https://nodejs.org/api/fs.html#fs_class_fs_stats)
+object of that path).
+* `ignoreInitial` (default: `false`). If set to `false` then `add`/`addDir` events are also emitted for matching paths while
+instantiating the watching as chokidar discovers these file paths (before the `ready` event).
+* `followSymlinks` (default: `true`). When `false`, only the
+symlinks themselves will be watched for changes instead of following
+the link references and bubbling events through the link's path.
+* `cwd` (no default). The base directory from which watch `paths` are to be
+derived. Paths emitted with events will be relative to this.
+* `disableGlobbing` (default: `false`). If set to `true` then the strings passed to `.watch()` and `.add()` are treated as
+literal path names, even if they look like globs.
+
+#### Performance
+
+* `usePolling` (default: `false`).
+Whether to use fs.watchFile (backed by polling), or fs.watch. If polling
+leads to high CPU utilization, consider setting this to `false`. It is
+typically necessary to **set this to `true` to successfully watch files over
+a network**, and it may be necessary to successfully watch files in other
+non-standard situations. Setting to `true` explicitly on MacOS overrides the
+`useFsEvents` default. You may also set the CHOKIDAR_USEPOLLING env variable
+to true (1) or false (0) in order to override this option.
+* _Polling-specific settings_ (effective when `usePolling: true`)
+  * `interval` (default: `100`). Interval of file system polling, in milliseconds. You may also
+    set the CHOKIDAR_INTERVAL env variable to override this option.
+  * `binaryInterval` (default: `300`). Interval of file system
+  polling for binary files.
+  ([see list of binary extensions](https://github.com/sindresorhus/binary-extensions/blob/master/binary-extensions.json))
+* `useFsEvents` (default: `true` on MacOS). Whether to use the
+`fsevents` watching interface if available. When set to `true` explicitly
+and `fsevents` is available this supercedes the `usePolling` setting. When
+set to `false` on MacOS, `usePolling: true` becomes the default.
+* `alwaysStat` (default: `false`). If relying upon the
+[`fs.Stats`](https://nodejs.org/api/fs.html#fs_class_fs_stats)
+object that may get passed with `add`, `addDir`, and `change` events, set
+this to `true` to ensure it is provided even in cases where it wasn't
+already available from the underlying watch events.
+* `depth` (default: `undefined`). If set, limits how many levels of
+subdirectories will be traversed.
+* `awaitWriteFinish` (default: `false`).
+By default, the `add` event will fire when a file first appears on disk, before
+the entire file has been written. Furthermore, in some cases some `change`
+events will be emitted while the file is being written. In some cases,
+especially when watching for large files there will be a need to wait for the
+write operation to finish before responding to a file creation or modification.
+Setting `awaitWriteFinish` to `true` (or a truthy value) will poll file size,
+holding its `add` and `change` events until the size does not change for a
+configurable amount of time. The appropriate duration setting is heavily
+dependent on the OS and hardware. For accurate detection this parameter should
+be relatively high, making file watching much less responsive.
+Use with caution.
+  * *`options.awaitWriteFinish` can be set to an object in order to adjust
+  timing params:*
+  * `awaitWriteFinish.stabilityThreshold` (default: 2000). Amount of time in
+  milliseconds for a file size to remain constant before emitting its event.
+  * `awaitWriteFinish.pollInterval` (default: 100). File size polling interval, in milliseconds.
+
+#### Errors
+
+* `ignorePermissionErrors` (default: `false`). Indicates whether to watch files
+that don't have read permissions if possible. If watching fails due to `EPERM`
+or `EACCES` with this set to `true`, the errors will be suppressed silently.
+* `atomic` (default: `true` if `useFsEvents` and `usePolling` are `false`).
+Automatically filters out artifacts that occur when using editors that use
+"atomic writes" instead of writing directly to the source file. If a file is
+re-added within 100 ms of being deleted, Chokidar emits a `change` event
+rather than `unlink` then `add`. If the default of 100 ms does not work well
+for you, you can override it by setting `atomic` to a custom value, in
+milliseconds.
+
+### Methods & Events
+
+`chokidar.watch()` produces an instance of `FSWatcher`. Methods of `FSWatcher`:
+
+* `.add(path / paths)`: Add files, directories, or glob patterns for tracking.
+Takes an array of strings or just one string.
+* `.on(event, callback)`: Listen for an FS event.
+Available events: `add`, `addDir`, `change`, `unlink`, `unlinkDir`, `ready`,
+`raw`, `error`.
+Additionally `all` is available which gets emitted with the underlying event
+name and path for every event other than `ready`, `raw`, and `error`.  `raw` is internal, use it carefully.
+* `.unwatch(path / paths)`: Stop watching files, directories, or glob patterns.
+Takes an array of strings or just one string.
+* `.close()`: **async** Removes all listeners from watched files. Asynchronous, returns Promise. Use with `await` to ensure bugs don't happen.
+* `.getWatched()`: Returns an object representing all the paths on the file
+system being watched by this `FSWatcher` instance. The object's keys are all the
+directories (using absolute paths unless the `cwd` option was used), and the
+values are arrays of the names of the items contained in each directory.
+
+## CLI
+
+If you need a CLI interface for your file watching, check out
+[chokidar-cli](https://github.com/open-cli-tools/chokidar-cli), allowing you to
+execute a command on each change, or get a stdio stream of change events.
+
+## Install Troubleshooting
+
+* `npm WARN optional dep failed, continuing fsevents@n.n.n`
+  * This message is normal part of how `npm` handles optional dependencies and is
+    not indicative of a problem. Even if accompanied by other related error messages,
+    Chokidar should function properly.
+
+* `TypeError: fsevents is not a constructor`
+  * Update chokidar by doing `rm -rf node_modules package-lock.json yarn.lock && npm install`, or update your dependency that uses chokidar.
+
+* Chokidar is producing `ENOSP` error on Linux, like this:
+  * `bash: cannot set terminal process group (-1): Inappropriate ioctl for device bash: no job control in this shell`
+  `Error: watch /home/ ENOSPC`
+  * This means Chokidar ran out of file handles and you'll need to increase their count by executing the following command in Terminal:
+  `echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p`
+
+## Changelog
+
+For more detailed changelog, see [`full_changelog.md`](.github/full_changelog.md).
+- **v3.5 (Jan 6, 2021):** Support for ARM Macs with Apple Silicon. Fixes for deleted symlinks.
+- **v3.4 (Apr 26, 2020):** Support for directory-based symlinks. Fixes for macos file replacement.
+- **v3.3 (Nov 2, 2019):** `FSWatcher#close()` method became async. That fixes IO race conditions related to close method.
+- **v3.2 (Oct 1, 2019):** Improve Linux RAM usage by 50%. Race condition fixes. Windows glob fixes. Improve stability by using tight range of dependency versions.
+- **v3.1 (Sep 16, 2019):** dotfiles are no longer filtered out by default. Use `ignored` option if needed. Improve initial Linux scan time by 50%.
+- **v3 (Apr 30, 2019):** massive CPU & RAM consumption improvements; reduces deps / package size by a factor of 17x and bumps Node.js requirement to v8.16 and higher.
+- **v2 (Dec 29, 2017):** Globs are now posix-style-only; without windows support. Tons of bugfixes.
+- **v1 (Apr 7, 2015):** Glob support, symlink support, tons of bugfixes. Node 0.8+ is supported
+- **v0.1 (Apr 20, 2012):** Initial release, extracted from [Brunch](https://github.com/brunch/brunch/blob/9847a065aea300da99bd0753f90354cde9de1261/src/helpers.coffee#L66)
+
+## Also
+
+Why was chokidar named this way? What's the meaning behind it?
+
+>Chowkidar is a transliteration of a Hindi word meaning 'watchman, gatekeeper', चौकीदार. This ultimately comes from Sanskrit _ चतुष्क_ (crossway, quadrangle, consisting-of-four).
+
+## License
+
+MIT (c) Paul Miller (<https://paulmillr.com>), see [LICENSE](LICENSE) file.
diff --git a/node_modules/chokidar/index.js b/node_modules/chokidar/index.js
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+++ b/node_modules/chokidar/index.js
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+'use strict';
+
+const { EventEmitter } = require('events');
+const fs = require('fs');
+const sysPath = require('path');
+const { promisify } = require('util');
+const readdirp = require('readdirp');
+const anymatch = require('anymatch').default;
+const globParent = require('glob-parent');
+const isGlob = require('is-glob');
+const braces = require('braces');
+const normalizePath = require('normalize-path');
+
+const NodeFsHandler = require('./lib/nodefs-handler');
+const FsEventsHandler = require('./lib/fsevents-handler');
+const {
+  EV_ALL,
+  EV_READY,
+  EV_ADD,
+  EV_CHANGE,
+  EV_UNLINK,
+  EV_ADD_DIR,
+  EV_UNLINK_DIR,
+  EV_RAW,
+  EV_ERROR,
+
+  STR_CLOSE,
+  STR_END,
+
+  BACK_SLASH_RE,
+  DOUBLE_SLASH_RE,
+  SLASH_OR_BACK_SLASH_RE,
+  DOT_RE,
+  REPLACER_RE,
+
+  SLASH,
+  SLASH_SLASH,
+  BRACE_START,
+  BANG,
+  ONE_DOT,
+  TWO_DOTS,
+  GLOBSTAR,
+  SLASH_GLOBSTAR,
+  ANYMATCH_OPTS,
+  STRING_TYPE,
+  FUNCTION_TYPE,
+  EMPTY_STR,
+  EMPTY_FN,
+
+  isWindows,
+  isMacos,
+  isIBMi
+} = require('./lib/constants');
+
+const stat = promisify(fs.stat);
+const readdir = promisify(fs.readdir);
+
+/**
+ * @typedef {String} Path
+ * @typedef {'all'|'add'|'addDir'|'change'|'unlink'|'unlinkDir'|'raw'|'error'|'ready'} EventName
+ * @typedef {'readdir'|'watch'|'add'|'remove'|'change'} ThrottleType
+ */
+
+/**
+ *
+ * @typedef {Object} WatchHelpers
+ * @property {Boolean} followSymlinks
+ * @property {'stat'|'lstat'} statMethod
+ * @property {Path} path
+ * @property {Path} watchPath
+ * @property {Function} entryPath
+ * @property {Boolean} hasGlob
+ * @property {Object} globFilter
+ * @property {Function} filterPath
+ * @property {Function} filterDir
+ */
+
+const arrify = (value = []) => Array.isArray(value) ? value : [value];
+const flatten = (list, result = []) => {
+  list.forEach(item => {
+    if (Array.isArray(item)) {
+      flatten(item, result);
+    } else {
+      result.push(item);
+    }
+  });
+  return result;
+};
+
+const unifyPaths = (paths_) => {
+  /**
+   * @type {Array<String>}
+   */
+  const paths = flatten(arrify(paths_));
+  if (!paths.every(p => typeof p === STRING_TYPE)) {
+    throw new TypeError(`Non-string provided as watch path: ${paths}`);
+  }
+  return paths.map(normalizePathToUnix);
+};
+
+// If SLASH_SLASH occurs at the beginning of path, it is not replaced
+//     because "//StoragePC/DrivePool/Movies" is a valid network path
+const toUnix = (string) => {
+  let str = string.replace(BACK_SLASH_RE, SLASH);
+  let prepend = false;
+  if (str.startsWith(SLASH_SLASH)) {
+    prepend = true;
+  }
+  while (str.match(DOUBLE_SLASH_RE)) {
+    str = str.replace(DOUBLE_SLASH_RE, SLASH);
+  }
+  if (prepend) {
+    str = SLASH + str;
+  }
+  return str;
+};
+
+// Our version of upath.normalize
+// TODO: this is not equal to path-normalize module - investigate why
+const normalizePathToUnix = (path) => toUnix(sysPath.normalize(toUnix(path)));
+
+const normalizeIgnored = (cwd = EMPTY_STR) => (path) => {
+  if (typeof path !== STRING_TYPE) return path;
+  return normalizePathToUnix(sysPath.isAbsolute(path) ? path : sysPath.join(cwd, path));
+};
+
+const getAbsolutePath = (path, cwd) => {
+  if (sysPath.isAbsolute(path)) {
+    return path;
+  }
+  if (path.startsWith(BANG)) {
+    return BANG + sysPath.join(cwd, path.slice(1));
+  }
+  return sysPath.join(cwd, path);
+};
+
+const undef = (opts, key) => opts[key] === undefined;
+
+/**
+ * Directory entry.
+ * @property {Path} path
+ * @property {Set<Path>} items
+ */
+class DirEntry {
+  /**
+   * @param {Path} dir
+   * @param {Function} removeWatcher
+   */
+  constructor(dir, removeWatcher) {
+    this.path = dir;
+    this._removeWatcher = removeWatcher;
+    /** @type {Set<Path>} */
+    this.items = new Set();
+  }
+
+  add(item) {
+    const {items} = this;
+    if (!items) return;
+    if (item !== ONE_DOT && item !== TWO_DOTS) items.add(item);
+  }
+
+  async remove(item) {
+    const {items} = this;
+    if (!items) return;
+    items.delete(item);
+    if (items.size > 0) return;
+
+    const dir = this.path;
+    try {
+      await readdir(dir);
+    } catch (err) {
+      if (this._removeWatcher) {
+        this._removeWatcher(sysPath.dirname(dir), sysPath.basename(dir));
+      }
+    }
+  }
+
+  has(item) {
+    const {items} = this;
+    if (!items) return;
+    return items.has(item);
+  }
+
+  /**
+   * @returns {Array<String>}
+   */
+  getChildren() {
+    const {items} = this;
+    if (!items) return;
+    return [...items.values()];
+  }
+
+  dispose() {
+    this.items.clear();
+    delete this.path;
+    delete this._removeWatcher;
+    delete this.items;
+    Object.freeze(this);
+  }
+}
+
+const STAT_METHOD_F = 'stat';
+const STAT_METHOD_L = 'lstat';
+class WatchHelper {
+  constructor(path, watchPath, follow, fsw) {
+    this.fsw = fsw;
+    this.path = path = path.replace(REPLACER_RE, EMPTY_STR);
+    this.watchPath = watchPath;
+    this.fullWatchPath = sysPath.resolve(watchPath);
+    this.hasGlob = watchPath !== path;
+    /** @type {object|boolean} */
+    if (path === EMPTY_STR) this.hasGlob = false;
+    this.globSymlink = this.hasGlob && follow ? undefined : false;
+    this.globFilter = this.hasGlob ? anymatch(path, undefined, ANYMATCH_OPTS) : false;
+    this.dirParts = this.getDirParts(path);
+    this.dirParts.forEach((parts) => {
+      if (parts.length > 1) parts.pop();
+    });
+    this.followSymlinks = follow;
+    this.statMethod = follow ? STAT_METHOD_F : STAT_METHOD_L;
+  }
+
+  checkGlobSymlink(entry) {
+    // only need to resolve once
+    // first entry should always have entry.parentDir === EMPTY_STR
+    if (this.globSymlink === undefined) {
+      this.globSymlink = entry.fullParentDir === this.fullWatchPath ?
+        false : {realPath: entry.fullParentDir, linkPath: this.fullWatchPath};
+    }
+
+    if (this.globSymlink) {
+      return entry.fullPath.replace(this.globSymlink.realPath, this.globSymlink.linkPath);
+    }
+
+    return entry.fullPath;
+  }
+
+  entryPath(entry) {
+    return sysPath.join(this.watchPath,
+      sysPath.relative(this.watchPath, this.checkGlobSymlink(entry))
+    );
+  }
+
+  filterPath(entry) {
+    const {stats} = entry;
+    if (stats && stats.isSymbolicLink()) return this.filterDir(entry);
+    const resolvedPath = this.entryPath(entry);
+    const matchesGlob = this.hasGlob && typeof this.globFilter === FUNCTION_TYPE ?
+      this.globFilter(resolvedPath) : true;
+    return matchesGlob &&
+      this.fsw._isntIgnored(resolvedPath, stats) &&
+      this.fsw._hasReadPermissions(stats);
+  }
+
+  getDirParts(path) {
+    if (!this.hasGlob) return [];
+    const parts = [];
+    const expandedPath = path.includes(BRACE_START) ? braces.expand(path) : [path];
+    expandedPath.forEach((path) => {
+      parts.push(sysPath.relative(this.watchPath, path).split(SLASH_OR_BACK_SLASH_RE));
+    });
+    return parts;
+  }
+
+  filterDir(entry) {
+    if (this.hasGlob) {
+      const entryParts = this.getDirParts(this.checkGlobSymlink(entry));
+      let globstar = false;
+      this.unmatchedGlob = !this.dirParts.some((parts) => {
+        return parts.every((part, i) => {
+          if (part === GLOBSTAR) globstar = true;
+          return globstar || !entryParts[0][i] || anymatch(part, entryParts[0][i], ANYMATCH_OPTS);
+        });
+      });
+    }
+    return !this.unmatchedGlob && this.fsw._isntIgnored(this.entryPath(entry), entry.stats);
+  }
+}
+
+/**
+ * Watches files & directories for changes. Emitted events:
+ * `add`, `addDir`, `change`, `unlink`, `unlinkDir`, `all`, `error`
+ *
+ *     new FSWatcher()
+ *       .add(directories)
+ *       .on('add', path => log('File', path, 'was added'))
+ */
+class FSWatcher extends EventEmitter {
+// Not indenting methods for history sake; for now.
+constructor(_opts) {
+  super();
+
+  const opts = {};
+  if (_opts) Object.assign(opts, _opts); // for frozen objects
+
+  /** @type {Map<String, DirEntry>} */
+  this._watched = new Map();
+  /** @type {Map<String, Array>} */
+  this._closers = new Map();
+  /** @type {Set<String>} */
+  this._ignoredPaths = new Set();
+
+  /** @type {Map<ThrottleType, Map>} */
+  this._throttled = new Map();
+
+  /** @type {Map<Path, String|Boolean>} */
+  this._symlinkPaths = new Map();
+
+  this._streams = new Set();
+  this.closed = false;
+
+  // Set up default options.
+  if (undef(opts, 'persistent')) opts.persistent = true;
+  if (undef(opts, 'ignoreInitial')) opts.ignoreInitial = false;
+  if (undef(opts, 'ignorePermissionErrors')) opts.ignorePermissionErrors = false;
+  if (undef(opts, 'interval')) opts.interval = 100;
+  if (undef(opts, 'binaryInterval')) opts.binaryInterval = 300;
+  if (undef(opts, 'disableGlobbing')) opts.disableGlobbing = false;
+  opts.enableBinaryInterval = opts.binaryInterval !== opts.interval;
+
+  // Enable fsevents on OS X when polling isn't explicitly enabled.
+  if (undef(opts, 'useFsEvents')) opts.useFsEvents = !opts.usePolling;
+
+  // If we can't use fsevents, ensure the options reflect it's disabled.
+  const canUseFsEvents = FsEventsHandler.canUse();
+  if (!canUseFsEvents) opts.useFsEvents = false;
+
+  // Use polling on Mac if not using fsevents.
+  // Other platforms use non-polling fs_watch.
+  if (undef(opts, 'usePolling') && !opts.useFsEvents) {
+    opts.usePolling = isMacos;
+  }
+
+  // Always default to polling on IBM i because fs.watch() is not available on IBM i.
+  if(isIBMi) {
+    opts.usePolling = true;
+  }
+
+  // Global override (useful for end-developers that need to force polling for all
+  // instances of chokidar, regardless of usage/dependency depth)
+  const envPoll = process.env.CHOKIDAR_USEPOLLING;
+  if (envPoll !== undefined) {
+    const envLower = envPoll.toLowerCase();
+
+    if (envLower === 'false' || envLower === '0') {
+      opts.usePolling = false;
+    } else if (envLower === 'true' || envLower === '1') {
+      opts.usePolling = true;
+    } else {
+      opts.usePolling = !!envLower;
+    }
+  }
+  const envInterval = process.env.CHOKIDAR_INTERVAL;
+  if (envInterval) {
+    opts.interval = Number.parseInt(envInterval, 10);
+  }
+
+  // Editor atomic write normalization enabled by default with fs.watch
+  if (undef(opts, 'atomic')) opts.atomic = !opts.usePolling && !opts.useFsEvents;
+  if (opts.atomic) this._pendingUnlinks = new Map();
+
+  if (undef(opts, 'followSymlinks')) opts.followSymlinks = true;
+
+  if (undef(opts, 'awaitWriteFinish')) opts.awaitWriteFinish = false;
+  if (opts.awaitWriteFinish === true) opts.awaitWriteFinish = {};
+  const awf = opts.awaitWriteFinish;
+  if (awf) {
+    if (!awf.stabilityThreshold) awf.stabilityThreshold = 2000;
+    if (!awf.pollInterval) awf.pollInterval = 100;
+    this._pendingWrites = new Map();
+  }
+  if (opts.ignored) opts.ignored = arrify(opts.ignored);
+
+  let readyCalls = 0;
+  this._emitReady = () => {
+    readyCalls++;
+    if (readyCalls >= this._readyCount) {
+      this._emitReady = EMPTY_FN;
+      this._readyEmitted = true;
+      // use process.nextTick to allow time for listener to be bound
+      process.nextTick(() => this.emit(EV_READY));
+    }
+  };
+  this._emitRaw = (...args) => this.emit(EV_RAW, ...args);
+  this._readyEmitted = false;
+  this.options = opts;
+
+  // Initialize with proper watcher.
+  if (opts.useFsEvents) {
+    this._fsEventsHandler = new FsEventsHandler(this);
+  } else {
+    this._nodeFsHandler = new NodeFsHandler(this);
+  }
+
+  // You’re frozen when your heart’s not open.
+  Object.freeze(opts);
+}
+
+// Public methods
+
+/**
+ * Adds paths to be watched on an existing FSWatcher instance
+ * @param {Path|Array<Path>} paths_
+ * @param {String=} _origAdd private; for handling non-existent paths to be watched
+ * @param {Boolean=} _internal private; indicates a non-user add
+ * @returns {FSWatcher} for chaining
+ */
+add(paths_, _origAdd, _internal) {
+  const {cwd, disableGlobbing} = this.options;
+  this.closed = false;
+  let paths = unifyPaths(paths_);
+  if (cwd) {
+    paths = paths.map((path) => {
+      const absPath = getAbsolutePath(path, cwd);
+
+      // Check `path` instead of `absPath` because the cwd portion can't be a glob
+      if (disableGlobbing || !isGlob(path)) {
+        return absPath;
+      }
+      return normalizePath(absPath);
+    });
+  }
+
+  // set aside negated glob strings
+  paths = paths.filter((path) => {
+    if (path.startsWith(BANG)) {
+      this._ignoredPaths.add(path.slice(1));
+      return false;
+    }
+
+    // if a path is being added that was previously ignored, stop ignoring it
+    this._ignoredPaths.delete(path);
+    this._ignoredPaths.delete(path + SLASH_GLOBSTAR);
+
+    // reset the cached userIgnored anymatch fn
+    // to make ignoredPaths changes effective
+    this._userIgnored = undefined;
+
+    return true;
+  });
+
+  if (this.options.useFsEvents && this._fsEventsHandler) {
+    if (!this._readyCount) this._readyCount = paths.length;
+    if (this.options.persistent) this._readyCount *= 2;
+    paths.forEach((path) => this._fsEventsHandler._addToFsEvents(path));
+  } else {
+    if (!this._readyCount) this._readyCount = 0;
+    this._readyCount += paths.length;
+    Promise.all(
+      paths.map(async path => {
+        const res = await this._nodeFsHandler._addToNodeFs(path, !_internal, 0, 0, _origAdd);
+        if (res) this._emitReady();
+        return res;
+      })
+    ).then(results => {
+      if (this.closed) return;
+      results.filter(item => item).forEach(item => {
+        this.add(sysPath.dirname(item), sysPath.basename(_origAdd || item));
+      });
+    });
+  }
+
+  return this;
+}
+
+/**
+ * Close watchers or start ignoring events from specified paths.
+ * @param {Path|Array<Path>} paths_ - string or array of strings, file/directory paths and/or globs
+ * @returns {FSWatcher} for chaining
+*/
+unwatch(paths_) {
+  if (this.closed) return this;
+  const paths = unifyPaths(paths_);
+  const {cwd} = this.options;
+
+  paths.forEach((path) => {
+    // convert to absolute path unless relative path already matches
+    if (!sysPath.isAbsolute(path) && !this._closers.has(path)) {
+      if (cwd) path = sysPath.join(cwd, path);
+      path = sysPath.resolve(path);
+    }
+
+    this._closePath(path);
+
+    this._ignoredPaths.add(path);
+    if (this._watched.has(path)) {
+      this._ignoredPaths.add(path + SLASH_GLOBSTAR);
+    }
+
+    // reset the cached userIgnored anymatch fn
+    // to make ignoredPaths changes effective
+    this._userIgnored = undefined;
+  });
+
+  return this;
+}
+
+/**
+ * Close watchers and remove all listeners from watched paths.
+ * @returns {Promise<void>}.
+*/
+close() {
+  if (this.closed) return this._closePromise;
+  this.closed = true;
+
+  // Memory management.
+  this.removeAllListeners();
+  const closers = [];
+  this._closers.forEach(closerList => closerList.forEach(closer => {
+    const promise = closer();
+    if (promise instanceof Promise) closers.push(promise);
+  }));
+  this._streams.forEach(stream => stream.destroy());
+  this._userIgnored = undefined;
+  this._readyCount = 0;
+  this._readyEmitted = false;
+  this._watched.forEach(dirent => dirent.dispose());
+  ['closers', 'watched', 'streams', 'symlinkPaths', 'throttled'].forEach(key => {
+    this[`_${key}`].clear();
+  });
+
+  this._closePromise = closers.length ? Promise.all(closers).then(() => undefined) : Promise.resolve();
+  return this._closePromise;
+}
+
+/**
+ * Expose list of watched paths
+ * @returns {Object} for chaining
+*/
+getWatched() {
+  const watchList = {};
+  this._watched.forEach((entry, dir) => {
+    const key = this.options.cwd ? sysPath.relative(this.options.cwd, dir) : dir;
+    watchList[key || ONE_DOT] = entry.getChildren().sort();
+  });
+  return watchList;
+}
+
+emitWithAll(event, args) {
+  this.emit(...args);
+  if (event !== EV_ERROR) this.emit(EV_ALL, ...args);
+}
+
+// Common helpers
+// --------------
+
+/**
+ * Normalize and emit events.
+ * Calling _emit DOES NOT MEAN emit() would be called!
+ * @param {EventName} event Type of event
+ * @param {Path} path File or directory path
+ * @param {*=} val1 arguments to be passed with event
+ * @param {*=} val2
+ * @param {*=} val3
+ * @returns the error if defined, otherwise the value of the FSWatcher instance's `closed` flag
+ */
+async _emit(event, path, val1, val2, val3) {
+  if (this.closed) return;
+
+  const opts = this.options;
+  if (isWindows) path = sysPath.normalize(path);
+  if (opts.cwd) path = sysPath.relative(opts.cwd, path);
+  /** @type Array<any> */
+  const args = [event, path];
+  if (val3 !== undefined) args.push(val1, val2, val3);
+  else if (val2 !== undefined) args.push(val1, val2);
+  else if (val1 !== undefined) args.push(val1);
+
+  const awf = opts.awaitWriteFinish;
+  let pw;
+  if (awf && (pw = this._pendingWrites.get(path))) {
+    pw.lastChange = new Date();
+    return this;
+  }
+
+  if (opts.atomic) {
+    if (event === EV_UNLINK) {
+      this._pendingUnlinks.set(path, args);
+      setTimeout(() => {
+        this._pendingUnlinks.forEach((entry, path) => {
+          this.emit(...entry);
+          this.emit(EV_ALL, ...entry);
+          this._pendingUnlinks.delete(path);
+        });
+      }, typeof opts.atomic === 'number' ? opts.atomic : 100);
+      return this;
+    }
+    if (event === EV_ADD && this._pendingUnlinks.has(path)) {
+      event = args[0] = EV_CHANGE;
+      this._pendingUnlinks.delete(path);
+    }
+  }
+
+  if (awf && (event === EV_ADD || event === EV_CHANGE) && this._readyEmitted) {
+    const awfEmit = (err, stats) => {
+      if (err) {
+        event = args[0] = EV_ERROR;
+        args[1] = err;
+        this.emitWithAll(event, args);
+      } else if (stats) {
+        // if stats doesn't exist the file must have been deleted
+        if (args.length > 2) {
+          args[2] = stats;
+        } else {
+          args.push(stats);
+        }
+        this.emitWithAll(event, args);
+      }
+    };
+
+    this._awaitWriteFinish(path, awf.stabilityThreshold, event, awfEmit);
+    return this;
+  }
+
+  if (event === EV_CHANGE) {
+    const isThrottled = !this._throttle(EV_CHANGE, path, 50);
+    if (isThrottled) return this;
+  }
+
+  if (opts.alwaysStat && val1 === undefined &&
+    (event === EV_ADD || event === EV_ADD_DIR || event === EV_CHANGE)
+  ) {
+    const fullPath = opts.cwd ? sysPath.join(opts.cwd, path) : path;
+    let stats;
+    try {
+      stats = await stat(fullPath);
+    } catch (err) {}
+    // Suppress event when fs_stat fails, to avoid sending undefined 'stat'
+    if (!stats || this.closed) return;
+    args.push(stats);
+  }
+  this.emitWithAll(event, args);
+
+  return this;
+}
+
+/**
+ * Common handler for errors
+ * @param {Error} error
+ * @returns {Error|Boolean} The error if defined, otherwise the value of the FSWatcher instance's `closed` flag
+ */
+_handleError(error) {
+  const code = error && error.code;
+  if (error && code !== 'ENOENT' && code !== 'ENOTDIR' &&
+    (!this.options.ignorePermissionErrors || (code !== 'EPERM' && code !== 'EACCES'))
+  ) {
+    this.emit(EV_ERROR, error);
+  }
+  return error || this.closed;
+}
+
+/**
+ * Helper utility for throttling
+ * @param {ThrottleType} actionType type being throttled
+ * @param {Path} path being acted upon
+ * @param {Number} timeout duration of time to suppress duplicate actions
+ * @returns {Object|false} tracking object or false if action should be suppressed
+ */
+_throttle(actionType, path, timeout) {
+  if (!this._throttled.has(actionType)) {
+    this._throttled.set(actionType, new Map());
+  }
+
+  /** @type {Map<Path, Object>} */
+  const action = this._throttled.get(actionType);
+  /** @type {Object} */
+  const actionPath = action.get(path);
+
+  if (actionPath) {
+    actionPath.count++;
+    return false;
+  }
+
+  let timeoutObject;
+  const clear = () => {
+    const item = action.get(path);
+    const count = item ? item.count : 0;
+    action.delete(path);
+    clearTimeout(timeoutObject);
+    if (item) clearTimeout(item.timeoutObject);
+    return count;
+  };
+  timeoutObject = setTimeout(clear, timeout);
+  const thr = {timeoutObject, clear, count: 0};
+  action.set(path, thr);
+  return thr;
+}
+
+_incrReadyCount() {
+  return this._readyCount++;
+}
+
+/**
+ * Awaits write operation to finish.
+ * Polls a newly created file for size variations. When files size does not change for 'threshold' milliseconds calls callback.
+ * @param {Path} path being acted upon
+ * @param {Number} threshold Time in milliseconds a file size must be fixed before acknowledging write OP is finished
+ * @param {EventName} event
+ * @param {Function} awfEmit Callback to be called when ready for event to be emitted.
+ */
+_awaitWriteFinish(path, threshold, event, awfEmit) {
+  let timeoutHandler;
+
+  let fullPath = path;
+  if (this.options.cwd && !sysPath.isAbsolute(path)) {
+    fullPath = sysPath.join(this.options.cwd, path);
+  }
+
+  const now = new Date();
+
+  const awaitWriteFinish = (prevStat) => {
+    fs.stat(fullPath, (err, curStat) => {
+      if (err || !this._pendingWrites.has(path)) {
+        if (err && err.code !== 'ENOENT') awfEmit(err);
+        return;
+      }
+
+      const now = Number(new Date());
+
+      if (prevStat && curStat.size !== prevStat.size) {
+        this._pendingWrites.get(path).lastChange = now;
+      }
+      const pw = this._pendingWrites.get(path);
+      const df = now - pw.lastChange;
+
+      if (df >= threshold) {
+        this._pendingWrites.delete(path);
+        awfEmit(undefined, curStat);
+      } else {
+        timeoutHandler = setTimeout(
+          awaitWriteFinish,
+          this.options.awaitWriteFinish.pollInterval,
+          curStat
+        );
+      }
+    });
+  };
+
+  if (!this._pendingWrites.has(path)) {
+    this._pendingWrites.set(path, {
+      lastChange: now,
+      cancelWait: () => {
+        this._pendingWrites.delete(path);
+        clearTimeout(timeoutHandler);
+        return event;
+      }
+    });
+    timeoutHandler = setTimeout(
+      awaitWriteFinish,
+      this.options.awaitWriteFinish.pollInterval
+    );
+  }
+}
+
+_getGlobIgnored() {
+  return [...this._ignoredPaths.values()];
+}
+
+/**
+ * Determines whether user has asked to ignore this path.
+ * @param {Path} path filepath or dir
+ * @param {fs.Stats=} stats result of fs.stat
+ * @returns {Boolean}
+ */
+_isIgnored(path, stats) {
+  if (this.options.atomic && DOT_RE.test(path)) return true;
+  if (!this._userIgnored) {
+    const {cwd} = this.options;
+    const ign = this.options.ignored;
+
+    const ignored = ign && ign.map(normalizeIgnored(cwd));
+    const paths = arrify(ignored)
+      .filter((path) => typeof path === STRING_TYPE && !isGlob(path))
+      .map((path) => path + SLASH_GLOBSTAR);
+    const list = this._getGlobIgnored().map(normalizeIgnored(cwd)).concat(ignored, paths);
+    this._userIgnored = anymatch(list, undefined, ANYMATCH_OPTS);
+  }
+
+  return this._userIgnored([path, stats]);
+}
+
+_isntIgnored(path, stat) {
+  return !this._isIgnored(path, stat);
+}
+
+/**
+ * Provides a set of common helpers and properties relating to symlink and glob handling.
+ * @param {Path} path file, directory, or glob pattern being watched
+ * @param {Number=} depth at any depth > 0, this isn't a glob
+ * @returns {WatchHelper} object containing helpers for this path
+ */
+_getWatchHelpers(path, depth) {
+  const watchPath = depth || this.options.disableGlobbing || !isGlob(path) ? path : globParent(path);
+  const follow = this.options.followSymlinks;
+
+  return new WatchHelper(path, watchPath, follow, this);
+}
+
+// Directory helpers
+// -----------------
+
+/**
+ * Provides directory tracking objects
+ * @param {String} directory path of the directory
+ * @returns {DirEntry} the directory's tracking object
+ */
+_getWatchedDir(directory) {
+  if (!this._boundRemove) this._boundRemove = this._remove.bind(this);
+  const dir = sysPath.resolve(directory);
+  if (!this._watched.has(dir)) this._watched.set(dir, new DirEntry(dir, this._boundRemove));
+  return this._watched.get(dir);
+}
+
+// File helpers
+// ------------
+
+/**
+ * Check for read permissions.
+ * Based on this answer on SO: https://stackoverflow.com/a/11781404/1358405
+ * @param {fs.Stats} stats - object, result of fs_stat
+ * @returns {Boolean} indicates whether the file can be read
+*/
+_hasReadPermissions(stats) {
+  if (this.options.ignorePermissionErrors) return true;
+
+  // stats.mode may be bigint
+  const md = stats && Number.parseInt(stats.mode, 10);
+  const st = md & 0o777;
+  const it = Number.parseInt(st.toString(8)[0], 10);
+  return Boolean(4 & it);
+}
+
+/**
+ * Handles emitting unlink events for
+ * files and directories, and via recursion, for
+ * files and directories within directories that are unlinked
+ * @param {String} directory within which the following item is located
+ * @param {String} item      base path of item/directory
+ * @returns {void}
+*/
+_remove(directory, item, isDirectory) {
+  // if what is being deleted is a directory, get that directory's paths
+  // for recursive deleting and cleaning of watched object
+  // if it is not a directory, nestedDirectoryChildren will be empty array
+  const path = sysPath.join(directory, item);
+  const fullPath = sysPath.resolve(path);
+  isDirectory = isDirectory != null
+    ? isDirectory
+    : this._watched.has(path) || this._watched.has(fullPath);
+
+  // prevent duplicate handling in case of arriving here nearly simultaneously
+  // via multiple paths (such as _handleFile and _handleDir)
+  if (!this._throttle('remove', path, 100)) return;
+
+  // if the only watched file is removed, watch for its return
+  if (!isDirectory && !this.options.useFsEvents && this._watched.size === 1) {
+    this.add(directory, item, true);
+  }
+
+  // This will create a new entry in the watched object in either case
+  // so we got to do the directory check beforehand
+  const wp = this._getWatchedDir(path);
+  const nestedDirectoryChildren = wp.getChildren();
+
+  // Recursively remove children directories / files.
+  nestedDirectoryChildren.forEach(nested => this._remove(path, nested));
+
+  // Check if item was on the watched list and remove it
+  const parent = this._getWatchedDir(directory);
+  const wasTracked = parent.has(item);
+  parent.remove(item);
+
+  // Fixes issue #1042 -> Relative paths were detected and added as symlinks
+  // (https://github.com/paulmillr/chokidar/blob/e1753ddbc9571bdc33b4a4af172d52cb6e611c10/lib/nodefs-handler.js#L612),
+  // but never removed from the map in case the path was deleted.
+  // This leads to an incorrect state if the path was recreated:
+  // https://github.com/paulmillr/chokidar/blob/e1753ddbc9571bdc33b4a4af172d52cb6e611c10/lib/nodefs-handler.js#L553
+  if (this._symlinkPaths.has(fullPath)) {
+    this._symlinkPaths.delete(fullPath);
+  }
+
+  // If we wait for this file to be fully written, cancel the wait.
+  let relPath = path;
+  if (this.options.cwd) relPath = sysPath.relative(this.options.cwd, path);
+  if (this.options.awaitWriteFinish && this._pendingWrites.has(relPath)) {
+    const event = this._pendingWrites.get(relPath).cancelWait();
+    if (event === EV_ADD) return;
+  }
+
+  // The Entry will either be a directory that just got removed
+  // or a bogus entry to a file, in either case we have to remove it
+  this._watched.delete(path);
+  this._watched.delete(fullPath);
+  const eventName = isDirectory ? EV_UNLINK_DIR : EV_UNLINK;
+  if (wasTracked && !this._isIgnored(path)) this._emit(eventName, path);
+
+  // Avoid conflicts if we later create another file with the same name
+  if (!this.options.useFsEvents) {
+    this._closePath(path);
+  }
+}
+
+/**
+ * Closes all watchers for a path
+ * @param {Path} path
+ */
+_closePath(path) {
+  this._closeFile(path)
+  const dir = sysPath.dirname(path);
+  this._getWatchedDir(dir).remove(sysPath.basename(path));
+}
+
+/**
+ * Closes only file-specific watchers
+ * @param {Path} path
+ */
+_closeFile(path) {
+  const closers = this._closers.get(path);
+  if (!closers) return;
+  closers.forEach(closer => closer());
+  this._closers.delete(path);
+}
+
+/**
+ *
+ * @param {Path} path
+ * @param {Function} closer
+ */
+_addPathCloser(path, closer) {
+  if (!closer) return;
+  let list = this._closers.get(path);
+  if (!list) {
+    list = [];
+    this._closers.set(path, list);
+  }
+  list.push(closer);
+}
+
+_readdirp(root, opts) {
+  if (this.closed) return;
+  const options = {type: EV_ALL, alwaysStat: true, lstat: true, ...opts};
+  let stream = readdirp(root, options);
+  this._streams.add(stream);
+  stream.once(STR_CLOSE, () => {
+    stream = undefined;
+  });
+  stream.once(STR_END, () => {
+    if (stream) {
+      this._streams.delete(stream);
+      stream = undefined;
+    }
+  });
+  return stream;
+}
+
+}
+
+// Export FSWatcher class
+exports.FSWatcher = FSWatcher;
+
+/**
+ * Instantiates watcher with paths to be tracked.
+ * @param {String|Array<String>} paths file/directory paths and/or globs
+ * @param {Object=} options chokidar opts
+ * @returns an instance of FSWatcher for chaining.
+ */
+const watch = (paths, options) => {
+  const watcher = new FSWatcher(options);
+  watcher.add(paths);
+  return watcher;
+};
+
+exports.watch = watch;
diff --git a/node_modules/chokidar/lib/constants.js b/node_modules/chokidar/lib/constants.js
new file mode 100644
index 0000000..1454f85
--- /dev/null
+++ b/node_modules/chokidar/lib/constants.js
@@ -0,0 +1,65 @@
+'use strict';
+
+const {sep} = require('path');
+const {platform} = process;
+const os = require('os');
+
+exports.EV_ALL = 'all';
+exports.EV_READY = 'ready';
+exports.EV_ADD = 'add';
+exports.EV_CHANGE = 'change';
+exports.EV_ADD_DIR = 'addDir';
+exports.EV_UNLINK = 'unlink';
+exports.EV_UNLINK_DIR = 'unlinkDir';
+exports.EV_RAW = 'raw';
+exports.EV_ERROR = 'error';
+
+exports.STR_DATA = 'data';
+exports.STR_END = 'end';
+exports.STR_CLOSE = 'close';
+
+exports.FSEVENT_CREATED = 'created';
+exports.FSEVENT_MODIFIED = 'modified';
+exports.FSEVENT_DELETED = 'deleted';
+exports.FSEVENT_MOVED = 'moved';
+exports.FSEVENT_CLONED = 'cloned';
+exports.FSEVENT_UNKNOWN = 'unknown';
+exports.FSEVENT_TYPE_FILE = 'file';
+exports.FSEVENT_TYPE_DIRECTORY = 'directory';
+exports.FSEVENT_TYPE_SYMLINK = 'symlink';
+
+exports.KEY_LISTENERS = 'listeners';
+exports.KEY_ERR = 'errHandlers';
+exports.KEY_RAW = 'rawEmitters';
+exports.HANDLER_KEYS = [exports.KEY_LISTENERS, exports.KEY_ERR, exports.KEY_RAW];
+
+exports.DOT_SLASH = `.${sep}`;
+
+exports.BACK_SLASH_RE = /\\/g;
+exports.DOUBLE_SLASH_RE = /\/\//;
+exports.SLASH_OR_BACK_SLASH_RE = /[/\\]/;
+exports.DOT_RE = /\..*\.(sw[px])$|~$|\.subl.*\.tmp/;
+exports.REPLACER_RE = /^\.[/\\]/;
+
+exports.SLASH = '/';
+exports.SLASH_SLASH = '//';
+exports.BRACE_START = '{';
+exports.BANG = '!';
+exports.ONE_DOT = '.';
+exports.TWO_DOTS = '..';
+exports.STAR = '*';
+exports.GLOBSTAR = '**';
+exports.ROOT_GLOBSTAR = '/**/*';
+exports.SLASH_GLOBSTAR = '/**';
+exports.DIR_SUFFIX = 'Dir';
+exports.ANYMATCH_OPTS = {dot: true};
+exports.STRING_TYPE = 'string';
+exports.FUNCTION_TYPE = 'function';
+exports.EMPTY_STR = '';
+exports.EMPTY_FN = () => {};
+exports.IDENTITY_FN = val => val;
+
+exports.isWindows = platform === 'win32';
+exports.isMacos = platform === 'darwin';
+exports.isLinux = platform === 'linux';
+exports.isIBMi = os.type() === 'OS400';
diff --git a/node_modules/chokidar/lib/fsevents-handler.js b/node_modules/chokidar/lib/fsevents-handler.js
new file mode 100644
index 0000000..0f7f2cb
--- /dev/null
+++ b/node_modules/chokidar/lib/fsevents-handler.js
@@ -0,0 +1,524 @@
+'use strict';
+
+const fs = require('fs');
+const sysPath = require('path');
+const { promisify } = require('util');
+
+let fsevents;
+try {
+  fsevents = require('fsevents');
+} catch (error) {
+  if (process.env.CHOKIDAR_PRINT_FSEVENTS_REQUIRE_ERROR) console.error(error);
+}
+
+if (fsevents) {
+  // TODO: real check
+  const mtch = process.version.match(/v(\d+)\.(\d+)/);
+  if (mtch && mtch[1] && mtch[2]) {
+    const maj = Number.parseInt(mtch[1], 10);
+    const min = Number.parseInt(mtch[2], 10);
+    if (maj === 8 && min < 16) {
+      fsevents = undefined;
+    }
+  }
+}
+
+const {
+  EV_ADD,
+  EV_CHANGE,
+  EV_ADD_DIR,
+  EV_UNLINK,
+  EV_ERROR,
+  STR_DATA,
+  STR_END,
+  FSEVENT_CREATED,
+  FSEVENT_MODIFIED,
+  FSEVENT_DELETED,
+  FSEVENT_MOVED,
+  // FSEVENT_CLONED,
+  FSEVENT_UNKNOWN,
+  FSEVENT_TYPE_FILE,
+  FSEVENT_TYPE_DIRECTORY,
+  FSEVENT_TYPE_SYMLINK,
+
+  ROOT_GLOBSTAR,
+  DIR_SUFFIX,
+  DOT_SLASH,
+  FUNCTION_TYPE,
+  EMPTY_FN,
+  IDENTITY_FN
+} = require('./constants');
+
+const Depth = (value) => isNaN(value) ? {} : {depth: value};
+
+const stat = promisify(fs.stat);
+const lstat = promisify(fs.lstat);
+const realpath = promisify(fs.realpath);
+
+const statMethods = { stat, lstat };
+
+/**
+ * @typedef {String} Path
+ */
+
+/**
+ * @typedef {Object} FsEventsWatchContainer
+ * @property {Set<Function>} listeners
+ * @property {Function} rawEmitter
+ * @property {{stop: Function}} watcher
+ */
+
+// fsevents instance helper functions
+/**
+ * Object to hold per-process fsevents instances (may be shared across chokidar FSWatcher instances)
+ * @type {Map<Path,FsEventsWatchContainer>}
+ */
+const FSEventsWatchers = new Map();
+
+// Threshold of duplicate path prefixes at which to start
+// consolidating going forward
+const consolidateThreshhold = 10;
+
+const wrongEventFlags = new Set([
+  69888, 70400, 71424, 72704, 73472, 131328, 131840, 262912
+]);
+
+/**
+ * Instantiates the fsevents interface
+ * @param {Path} path path to be watched
+ * @param {Function} callback called when fsevents is bound and ready
+ * @returns {{stop: Function}} new fsevents instance
+ */
+const createFSEventsInstance = (path, callback) => {
+  const stop = fsevents.watch(path, callback);
+  return {stop};
+};
+
+/**
+ * Instantiates the fsevents interface or binds listeners to an existing one covering
+ * the same file tree.
+ * @param {Path} path           - to be watched
+ * @param {Path} realPath       - real path for symlinks
+ * @param {Function} listener   - called when fsevents emits events
+ * @param {Function} rawEmitter - passes data to listeners of the 'raw' event
+ * @returns {Function} closer
+ */
+function setFSEventsListener(path, realPath, listener, rawEmitter) {
+  let watchPath = sysPath.extname(realPath) ? sysPath.dirname(realPath) : realPath;
+
+  const parentPath = sysPath.dirname(watchPath);
+  let cont = FSEventsWatchers.get(watchPath);
+
+  // If we've accumulated a substantial number of paths that
+  // could have been consolidated by watching one directory
+  // above the current one, create a watcher on the parent
+  // path instead, so that we do consolidate going forward.
+  if (couldConsolidate(parentPath)) {
+    watchPath = parentPath;
+  }
+
+  const resolvedPath = sysPath.resolve(path);
+  const hasSymlink = resolvedPath !== realPath;
+
+  const filteredListener = (fullPath, flags, info) => {
+    if (hasSymlink) fullPath = fullPath.replace(realPath, resolvedPath);
+    if (
+      fullPath === resolvedPath ||
+      !fullPath.indexOf(resolvedPath + sysPath.sep)
+    ) listener(fullPath, flags, info);
+  };
+
+  // check if there is already a watcher on a parent path
+  // modifies `watchPath` to the parent path when it finds a match
+  let watchedParent = false;
+  for (const watchedPath of FSEventsWatchers.keys()) {
+    if (realPath.indexOf(sysPath.resolve(watchedPath) + sysPath.sep) === 0) {
+      watchPath = watchedPath;
+      cont = FSEventsWatchers.get(watchPath);
+      watchedParent = true;
+      break;
+    }
+  }
+
+  if (cont || watchedParent) {
+    cont.listeners.add(filteredListener);
+  } else {
+    cont = {
+      listeners: new Set([filteredListener]),
+      rawEmitter,
+      watcher: createFSEventsInstance(watchPath, (fullPath, flags) => {
+        if (!cont.listeners.size) return;
+        const info = fsevents.getInfo(fullPath, flags);
+        cont.listeners.forEach(list => {
+          list(fullPath, flags, info);
+        });
+
+        cont.rawEmitter(info.event, fullPath, info);
+      })
+    };
+    FSEventsWatchers.set(watchPath, cont);
+  }
+
+  // removes this instance's listeners and closes the underlying fsevents
+  // instance if there are no more listeners left
+  return () => {
+    const lst = cont.listeners;
+
+    lst.delete(filteredListener);
+    if (!lst.size) {
+      FSEventsWatchers.delete(watchPath);
+      if (cont.watcher) return cont.watcher.stop().then(() => {
+        cont.rawEmitter = cont.watcher = undefined;
+        Object.freeze(cont);
+      });
+    }
+  };
+}
+
+// Decide whether or not we should start a new higher-level
+// parent watcher
+const couldConsolidate = (path) => {
+  let count = 0;
+  for (const watchPath of FSEventsWatchers.keys()) {
+    if (watchPath.indexOf(path) === 0) {
+      count++;
+      if (count >= consolidateThreshhold) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+};
+
+// returns boolean indicating whether fsevents can be used
+const canUse = () => fsevents && FSEventsWatchers.size < 128;
+
+// determines subdirectory traversal levels from root to path
+const calcDepth = (path, root) => {
+  let i = 0;
+  while (!path.indexOf(root) && (path = sysPath.dirname(path)) !== root) i++;
+  return i;
+};
+
+// returns boolean indicating whether the fsevents' event info has the same type
+// as the one returned by fs.stat
+const sameTypes = (info, stats) => (
+  info.type === FSEVENT_TYPE_DIRECTORY && stats.isDirectory() ||
+  info.type === FSEVENT_TYPE_SYMLINK && stats.isSymbolicLink() ||
+  info.type === FSEVENT_TYPE_FILE && stats.isFile()
+)
+
+/**
+ * @mixin
+ */
+class FsEventsHandler {
+
+/**
+ * @param {import('../index').FSWatcher} fsw
+ */
+constructor(fsw) {
+  this.fsw = fsw;
+}
+checkIgnored(path, stats) {
+  const ipaths = this.fsw._ignoredPaths;
+  if (this.fsw._isIgnored(path, stats)) {
+    ipaths.add(path);
+    if (stats && stats.isDirectory()) {
+      ipaths.add(path + ROOT_GLOBSTAR);
+    }
+    return true;
+  }
+
+  ipaths.delete(path);
+  ipaths.delete(path + ROOT_GLOBSTAR);
+}
+
+addOrChange(path, fullPath, realPath, parent, watchedDir, item, info, opts) {
+  const event = watchedDir.has(item) ? EV_CHANGE : EV_ADD;
+  this.handleEvent(event, path, fullPath, realPath, parent, watchedDir, item, info, opts);
+}
+
+async checkExists(path, fullPath, realPath, parent, watchedDir, item, info, opts) {
+  try {
+    const stats = await stat(path)
+    if (this.fsw.closed) return;
+    if (sameTypes(info, stats)) {
+      this.addOrChange(path, fullPath, realPath, parent, watchedDir, item, info, opts);
+    } else {
+      this.handleEvent(EV_UNLINK, path, fullPath, realPath, parent, watchedDir, item, info, opts);
+    }
+  } catch (error) {
+    if (error.code === 'EACCES') {
+      this.addOrChange(path, fullPath, realPath, parent, watchedDir, item, info, opts);
+    } else {
+      this.handleEvent(EV_UNLINK, path, fullPath, realPath, parent, watchedDir, item, info, opts);
+    }
+  }
+}
+
+handleEvent(event, path, fullPath, realPath, parent, watchedDir, item, info, opts) {
+  if (this.fsw.closed || this.checkIgnored(path)) return;
+
+  if (event === EV_UNLINK) {
+    const isDirectory = info.type === FSEVENT_TYPE_DIRECTORY
+    // suppress unlink events on never before seen files
+    if (isDirectory || watchedDir.has(item)) {
+      this.fsw._remove(parent, item, isDirectory);
+    }
+  } else {
+    if (event === EV_ADD) {
+      // track new directories
+      if (info.type === FSEVENT_TYPE_DIRECTORY) this.fsw._getWatchedDir(path);
+
+      if (info.type === FSEVENT_TYPE_SYMLINK && opts.followSymlinks) {
+        // push symlinks back to the top of the stack to get handled
+        const curDepth = opts.depth === undefined ?
+          undefined : calcDepth(fullPath, realPath) + 1;
+        return this._addToFsEvents(path, false, true, curDepth);
+      }
+
+      // track new paths
+      // (other than symlinks being followed, which will be tracked soon)
+      this.fsw._getWatchedDir(parent).add(item);
+    }
+    /**
+     * @type {'add'|'addDir'|'unlink'|'unlinkDir'}
+     */
+    const eventName = info.type === FSEVENT_TYPE_DIRECTORY ? event + DIR_SUFFIX : event;
+    this.fsw._emit(eventName, path);
+    if (eventName === EV_ADD_DIR) this._addToFsEvents(path, false, true);
+  }
+}
+
+/**
+ * Handle symlinks encountered during directory scan
+ * @param {String} watchPath  - file/dir path to be watched with fsevents
+ * @param {String} realPath   - real path (in case of symlinks)
+ * @param {Function} transform  - path transformer
+ * @param {Function} globFilter - path filter in case a glob pattern was provided
+ * @returns {Function} closer for the watcher instance
+*/
+_watchWithFsEvents(watchPath, realPath, transform, globFilter) {
+  if (this.fsw.closed || this.fsw._isIgnored(watchPath)) return;
+  const opts = this.fsw.options;
+  const watchCallback = async (fullPath, flags, info) => {
+    if (this.fsw.closed) return;
+    if (
+      opts.depth !== undefined &&
+      calcDepth(fullPath, realPath) > opts.depth
+    ) return;
+    const path = transform(sysPath.join(
+      watchPath, sysPath.relative(watchPath, fullPath)
+    ));
+    if (globFilter && !globFilter(path)) return;
+    // ensure directories are tracked
+    const parent = sysPath.dirname(path);
+    const item = sysPath.basename(path);
+    const watchedDir = this.fsw._getWatchedDir(
+      info.type === FSEVENT_TYPE_DIRECTORY ? path : parent
+    );
+
+    // correct for wrong events emitted
+    if (wrongEventFlags.has(flags) || info.event === FSEVENT_UNKNOWN) {
+      if (typeof opts.ignored === FUNCTION_TYPE) {
+        let stats;
+        try {
+          stats = await stat(path);
+        } catch (error) {}
+        if (this.fsw.closed) return;
+        if (this.checkIgnored(path, stats)) return;
+        if (sameTypes(info, stats)) {
+          this.addOrChange(path, fullPath, realPath, parent, watchedDir, item, info, opts);
+        } else {
+          this.handleEvent(EV_UNLINK, path, fullPath, realPath, parent, watchedDir, item, info, opts);
+        }
+      } else {
+        this.checkExists(path, fullPath, realPath, parent, watchedDir, item, info, opts);
+      }
+    } else {
+      switch (info.event) {
+      case FSEVENT_CREATED:
+      case FSEVENT_MODIFIED:
+        return this.addOrChange(path, fullPath, realPath, parent, watchedDir, item, info, opts);
+      case FSEVENT_DELETED:
+      case FSEVENT_MOVED:
+        return this.checkExists(path, fullPath, realPath, parent, watchedDir, item, info, opts);
+      }
+    }
+  };
+
+  const closer = setFSEventsListener(
+    watchPath,
+    realPath,
+    watchCallback,
+    this.fsw._emitRaw
+  );
+
+  this.fsw._emitReady();
+  return closer;
+}
+
+/**
+ * Handle symlinks encountered during directory scan
+ * @param {String} linkPath path to symlink
+ * @param {String} fullPath absolute path to the symlink
+ * @param {Function} transform pre-existing path transformer
+ * @param {Number} curDepth level of subdirectories traversed to where symlink is
+ * @returns {Promise<void>}
+ */
+async _handleFsEventsSymlink(linkPath, fullPath, transform, curDepth) {
+  // don't follow the same symlink more than once
+  if (this.fsw.closed || this.fsw._symlinkPaths.has(fullPath)) return;
+
+  this.fsw._symlinkPaths.set(fullPath, true);
+  this.fsw._incrReadyCount();
+
+  try {
+    const linkTarget = await realpath(linkPath);
+    if (this.fsw.closed) return;
+    if (this.fsw._isIgnored(linkTarget)) {
+      return this.fsw._emitReady();
+    }
+
+    this.fsw._incrReadyCount();
+
+    // add the linkTarget for watching with a wrapper for transform
+    // that causes emitted paths to incorporate the link's path
+    this._addToFsEvents(linkTarget || linkPath, (path) => {
+      let aliasedPath = linkPath;
+      if (linkTarget && linkTarget !== DOT_SLASH) {
+        aliasedPath = path.replace(linkTarget, linkPath);
+      } else if (path !== DOT_SLASH) {
+        aliasedPath = sysPath.join(linkPath, path);
+      }
+      return transform(aliasedPath);
+    }, false, curDepth);
+  } catch(error) {
+    if (this.fsw._handleError(error)) {
+      return this.fsw._emitReady();
+    }
+  }
+}
+
+/**
+ *
+ * @param {Path} newPath
+ * @param {fs.Stats} stats
+ */
+emitAdd(newPath, stats, processPath, opts, forceAdd) {
+  const pp = processPath(newPath);
+  const isDir = stats.isDirectory();
+  const dirObj = this.fsw._getWatchedDir(sysPath.dirname(pp));
+  const base = sysPath.basename(pp);
+
+  // ensure empty dirs get tracked
+  if (isDir) this.fsw._getWatchedDir(pp);
+  if (dirObj.has(base)) return;
+  dirObj.add(base);
+
+  if (!opts.ignoreInitial || forceAdd === true) {
+    this.fsw._emit(isDir ? EV_ADD_DIR : EV_ADD, pp, stats);
+  }
+}
+
+initWatch(realPath, path, wh, processPath) {
+  if (this.fsw.closed) return;
+  const closer = this._watchWithFsEvents(
+    wh.watchPath,
+    sysPath.resolve(realPath || wh.watchPath),
+    processPath,
+    wh.globFilter
+  );
+  this.fsw._addPathCloser(path, closer);
+}
+
+/**
+ * Handle added path with fsevents
+ * @param {String} path file/dir path or glob pattern
+ * @param {Function|Boolean=} transform converts working path to what the user expects
+ * @param {Boolean=} forceAdd ensure add is emitted
+ * @param {Number=} priorDepth Level of subdirectories already traversed.
+ * @returns {Promise<void>}
+ */
+async _addToFsEvents(path, transform, forceAdd, priorDepth) {
+  if (this.fsw.closed) {
+    return;
+  }
+  const opts = this.fsw.options;
+  const processPath = typeof transform === FUNCTION_TYPE ? transform : IDENTITY_FN;
+
+  const wh = this.fsw._getWatchHelpers(path);
+
+  // evaluate what is at the path we're being asked to watch
+  try {
+    const stats = await statMethods[wh.statMethod](wh.watchPath);
+    if (this.fsw.closed) return;
+    if (this.fsw._isIgnored(wh.watchPath, stats)) {
+      throw null;
+    }
+    if (stats.isDirectory()) {
+      // emit addDir unless this is a glob parent
+      if (!wh.globFilter) this.emitAdd(processPath(path), stats, processPath, opts, forceAdd);
+
+      // don't recurse further if it would exceed depth setting
+      if (priorDepth && priorDepth > opts.depth) return;
+
+      // scan the contents of the dir
+      this.fsw._readdirp(wh.watchPath, {
+        fileFilter: entry => wh.filterPath(entry),
+        directoryFilter: entry => wh.filterDir(entry),
+        ...Depth(opts.depth - (priorDepth || 0))
+      }).on(STR_DATA, (entry) => {
+        // need to check filterPath on dirs b/c filterDir is less restrictive
+        if (this.fsw.closed) {
+          return;
+        }
+        if (entry.stats.isDirectory() && !wh.filterPath(entry)) return;
+
+        const joinedPath = sysPath.join(wh.watchPath, entry.path);
+        const {fullPath} = entry;
+
+        if (wh.followSymlinks && entry.stats.isSymbolicLink()) {
+          // preserve the current depth here since it can't be derived from
+          // real paths past the symlink
+          const curDepth = opts.depth === undefined ?
+            undefined : calcDepth(joinedPath, sysPath.resolve(wh.watchPath)) + 1;
+
+          this._handleFsEventsSymlink(joinedPath, fullPath, processPath, curDepth);
+        } else {
+          this.emitAdd(joinedPath, entry.stats, processPath, opts, forceAdd);
+        }
+      }).on(EV_ERROR, EMPTY_FN).on(STR_END, () => {
+        this.fsw._emitReady();
+      });
+    } else {
+      this.emitAdd(wh.watchPath, stats, processPath, opts, forceAdd);
+      this.fsw._emitReady();
+    }
+  } catch (error) {
+    if (!error || this.fsw._handleError(error)) {
+      // TODO: Strange thing: "should not choke on an ignored watch path" will be failed without 2 ready calls -__-
+      this.fsw._emitReady();
+      this.fsw._emitReady();
+    }
+  }
+
+  if (opts.persistent && forceAdd !== true) {
+    if (typeof transform === FUNCTION_TYPE) {
+      // realpath has already been resolved
+      this.initWatch(undefined, path, wh, processPath);
+    } else {
+      let realPath;
+      try {
+        realPath = await realpath(wh.watchPath);
+      } catch (e) {}
+      this.initWatch(realPath, path, wh, processPath);
+    }
+  }
+}
+
+}
+
+module.exports = FsEventsHandler;
+module.exports.canUse = canUse;
diff --git a/node_modules/chokidar/lib/nodefs-handler.js b/node_modules/chokidar/lib/nodefs-handler.js
new file mode 100644
index 0000000..199cfe9
--- /dev/null
+++ b/node_modules/chokidar/lib/nodefs-handler.js
@@ -0,0 +1,654 @@
+'use strict';
+
+const fs = require('fs');
+const sysPath = require('path');
+const { promisify } = require('util');
+const isBinaryPath = require('is-binary-path');
+const {
+  isWindows,
+  isLinux,
+  EMPTY_FN,
+  EMPTY_STR,
+  KEY_LISTENERS,
+  KEY_ERR,
+  KEY_RAW,
+  HANDLER_KEYS,
+  EV_CHANGE,
+  EV_ADD,
+  EV_ADD_DIR,
+  EV_ERROR,
+  STR_DATA,
+  STR_END,
+  BRACE_START,
+  STAR
+} = require('./constants');
+
+const THROTTLE_MODE_WATCH = 'watch';
+
+const open = promisify(fs.open);
+const stat = promisify(fs.stat);
+const lstat = promisify(fs.lstat);
+const close = promisify(fs.close);
+const fsrealpath = promisify(fs.realpath);
+
+const statMethods = { lstat, stat };
+
+// TODO: emit errors properly. Example: EMFILE on Macos.
+const foreach = (val, fn) => {
+  if (val instanceof Set) {
+    val.forEach(fn);
+  } else {
+    fn(val);
+  }
+};
+
+const addAndConvert = (main, prop, item) => {
+  let container = main[prop];
+  if (!(container instanceof Set)) {
+    main[prop] = container = new Set([container]);
+  }
+  container.add(item);
+};
+
+const clearItem = cont => key => {
+  const set = cont[key];
+  if (set instanceof Set) {
+    set.clear();
+  } else {
+    delete cont[key];
+  }
+};
+
+const delFromSet = (main, prop, item) => {
+  const container = main[prop];
+  if (container instanceof Set) {
+    container.delete(item);
+  } else if (container === item) {
+    delete main[prop];
+  }
+};
+
+const isEmptySet = (val) => val instanceof Set ? val.size === 0 : !val;
+
+/**
+ * @typedef {String} Path
+ */
+
+// fs_watch helpers
+
+// object to hold per-process fs_watch instances
+// (may be shared across chokidar FSWatcher instances)
+
+/**
+ * @typedef {Object} FsWatchContainer
+ * @property {Set} listeners
+ * @property {Set} errHandlers
+ * @property {Set} rawEmitters
+ * @property {fs.FSWatcher=} watcher
+ * @property {Boolean=} watcherUnusable
+ */
+
+/**
+ * @type {Map<String,FsWatchContainer>}
+ */
+const FsWatchInstances = new Map();
+
+/**
+ * Instantiates the fs_watch interface
+ * @param {String} path to be watched
+ * @param {Object} options to be passed to fs_watch
+ * @param {Function} listener main event handler
+ * @param {Function} errHandler emits info about errors
+ * @param {Function} emitRaw emits raw event data
+ * @returns {fs.FSWatcher} new fsevents instance
+ */
+function createFsWatchInstance(path, options, listener, errHandler, emitRaw) {
+  const handleEvent = (rawEvent, evPath) => {
+    listener(path);
+    emitRaw(rawEvent, evPath, {watchedPath: path});
+
+    // emit based on events occurring for files from a directory's watcher in
+    // case the file's watcher misses it (and rely on throttling to de-dupe)
+    if (evPath && path !== evPath) {
+      fsWatchBroadcast(
+        sysPath.resolve(path, evPath), KEY_LISTENERS, sysPath.join(path, evPath)
+      );
+    }
+  };
+  try {
+    return fs.watch(path, options, handleEvent);
+  } catch (error) {
+    errHandler(error);
+  }
+}
+
+/**
+ * Helper for passing fs_watch event data to a collection of listeners
+ * @param {Path} fullPath absolute path bound to fs_watch instance
+ * @param {String} type listener type
+ * @param {*=} val1 arguments to be passed to listeners
+ * @param {*=} val2
+ * @param {*=} val3
+ */
+const fsWatchBroadcast = (fullPath, type, val1, val2, val3) => {
+  const cont = FsWatchInstances.get(fullPath);
+  if (!cont) return;
+  foreach(cont[type], (listener) => {
+    listener(val1, val2, val3);
+  });
+};
+
+/**
+ * Instantiates the fs_watch interface or binds listeners
+ * to an existing one covering the same file system entry
+ * @param {String} path
+ * @param {String} fullPath absolute path
+ * @param {Object} options to be passed to fs_watch
+ * @param {Object} handlers container for event listener functions
+ */
+const setFsWatchListener = (path, fullPath, options, handlers) => {
+  const {listener, errHandler, rawEmitter} = handlers;
+  let cont = FsWatchInstances.get(fullPath);
+
+  /** @type {fs.FSWatcher=} */
+  let watcher;
+  if (!options.persistent) {
+    watcher = createFsWatchInstance(
+      path, options, listener, errHandler, rawEmitter
+    );
+    return watcher.close.bind(watcher);
+  }
+  if (cont) {
+    addAndConvert(cont, KEY_LISTENERS, listener);
+    addAndConvert(cont, KEY_ERR, errHandler);
+    addAndConvert(cont, KEY_RAW, rawEmitter);
+  } else {
+    watcher = createFsWatchInstance(
+      path,
+      options,
+      fsWatchBroadcast.bind(null, fullPath, KEY_LISTENERS),
+      errHandler, // no need to use broadcast here
+      fsWatchBroadcast.bind(null, fullPath, KEY_RAW)
+    );
+    if (!watcher) return;
+    watcher.on(EV_ERROR, async (error) => {
+      const broadcastErr = fsWatchBroadcast.bind(null, fullPath, KEY_ERR);
+      cont.watcherUnusable = true; // documented since Node 10.4.1
+      // Workaround for https://github.com/joyent/node/issues/4337
+      if (isWindows && error.code === 'EPERM') {
+        try {
+          const fd = await open(path, 'r');
+          await close(fd);
+          broadcastErr(error);
+        } catch (err) {}
+      } else {
+        broadcastErr(error);
+      }
+    });
+    cont = {
+      listeners: listener,
+      errHandlers: errHandler,
+      rawEmitters: rawEmitter,
+      watcher
+    };
+    FsWatchInstances.set(fullPath, cont);
+  }
+  // const index = cont.listeners.indexOf(listener);
+
+  // removes this instance's listeners and closes the underlying fs_watch
+  // instance if there are no more listeners left
+  return () => {
+    delFromSet(cont, KEY_LISTENERS, listener);
+    delFromSet(cont, KEY_ERR, errHandler);
+    delFromSet(cont, KEY_RAW, rawEmitter);
+    if (isEmptySet(cont.listeners)) {
+      // Check to protect against issue gh-730.
+      // if (cont.watcherUnusable) {
+      cont.watcher.close();
+      // }
+      FsWatchInstances.delete(fullPath);
+      HANDLER_KEYS.forEach(clearItem(cont));
+      cont.watcher = undefined;
+      Object.freeze(cont);
+    }
+  };
+};
+
+// fs_watchFile helpers
+
+// object to hold per-process fs_watchFile instances
+// (may be shared across chokidar FSWatcher instances)
+const FsWatchFileInstances = new Map();
+
+/**
+ * Instantiates the fs_watchFile interface or binds listeners
+ * to an existing one covering the same file system entry
+ * @param {String} path to be watched
+ * @param {String} fullPath absolute path
+ * @param {Object} options options to be passed to fs_watchFile
+ * @param {Object} handlers container for event listener functions
+ * @returns {Function} closer
+ */
+const setFsWatchFileListener = (path, fullPath, options, handlers) => {
+  const {listener, rawEmitter} = handlers;
+  let cont = FsWatchFileInstances.get(fullPath);
+
+  /* eslint-disable no-unused-vars, prefer-destructuring */
+  let listeners = new Set();
+  let rawEmitters = new Set();
+
+  const copts = cont && cont.options;
+  if (copts && (copts.persistent < options.persistent || copts.interval > options.interval)) {
+    // "Upgrade" the watcher to persistence or a quicker interval.
+    // This creates some unlikely edge case issues if the user mixes
+    // settings in a very weird way, but solving for those cases
+    // doesn't seem worthwhile for the added complexity.
+    listeners = cont.listeners;
+    rawEmitters = cont.rawEmitters;
+    fs.unwatchFile(fullPath);
+    cont = undefined;
+  }
+
+  /* eslint-enable no-unused-vars, prefer-destructuring */
+
+  if (cont) {
+    addAndConvert(cont, KEY_LISTENERS, listener);
+    addAndConvert(cont, KEY_RAW, rawEmitter);
+  } else {
+    // TODO
+    // listeners.add(listener);
+    // rawEmitters.add(rawEmitter);
+    cont = {
+      listeners: listener,
+      rawEmitters: rawEmitter,
+      options,
+      watcher: fs.watchFile(fullPath, options, (curr, prev) => {
+        foreach(cont.rawEmitters, (rawEmitter) => {
+          rawEmitter(EV_CHANGE, fullPath, {curr, prev});
+        });
+        const currmtime = curr.mtimeMs;
+        if (curr.size !== prev.size || currmtime > prev.mtimeMs || currmtime === 0) {
+          foreach(cont.listeners, (listener) => listener(path, curr));
+        }
+      })
+    };
+    FsWatchFileInstances.set(fullPath, cont);
+  }
+  // const index = cont.listeners.indexOf(listener);
+
+  // Removes this instance's listeners and closes the underlying fs_watchFile
+  // instance if there are no more listeners left.
+  return () => {
+    delFromSet(cont, KEY_LISTENERS, listener);
+    delFromSet(cont, KEY_RAW, rawEmitter);
+    if (isEmptySet(cont.listeners)) {
+      FsWatchFileInstances.delete(fullPath);
+      fs.unwatchFile(fullPath);
+      cont.options = cont.watcher = undefined;
+      Object.freeze(cont);
+    }
+  };
+};
+
+/**
+ * @mixin
+ */
+class NodeFsHandler {
+
+/**
+ * @param {import("../index").FSWatcher} fsW
+ */
+constructor(fsW) {
+  this.fsw = fsW;
+  this._boundHandleError = (error) => fsW._handleError(error);
+}
+
+/**
+ * Watch file for changes with fs_watchFile or fs_watch.
+ * @param {String} path to file or dir
+ * @param {Function} listener on fs change
+ * @returns {Function} closer for the watcher instance
+ */
+_watchWithNodeFs(path, listener) {
+  const opts = this.fsw.options;
+  const directory = sysPath.dirname(path);
+  const basename = sysPath.basename(path);
+  const parent = this.fsw._getWatchedDir(directory);
+  parent.add(basename);
+  const absolutePath = sysPath.resolve(path);
+  const options = {persistent: opts.persistent};
+  if (!listener) listener = EMPTY_FN;
+
+  let closer;
+  if (opts.usePolling) {
+    options.interval = opts.enableBinaryInterval && isBinaryPath(basename) ?
+      opts.binaryInterval : opts.interval;
+    closer = setFsWatchFileListener(path, absolutePath, options, {
+      listener,
+      rawEmitter: this.fsw._emitRaw
+    });
+  } else {
+    closer = setFsWatchListener(path, absolutePath, options, {
+      listener,
+      errHandler: this._boundHandleError,
+      rawEmitter: this.fsw._emitRaw
+    });
+  }
+  return closer;
+}
+
+/**
+ * Watch a file and emit add event if warranted.
+ * @param {Path} file Path
+ * @param {fs.Stats} stats result of fs_stat
+ * @param {Boolean} initialAdd was the file added at watch instantiation?
+ * @returns {Function} closer for the watcher instance
+ */
+_handleFile(file, stats, initialAdd) {
+  if (this.fsw.closed) {
+    return;
+  }
+  const dirname = sysPath.dirname(file);
+  const basename = sysPath.basename(file);
+  const parent = this.fsw._getWatchedDir(dirname);
+  // stats is always present
+  let prevStats = stats;
+
+  // if the file is already being watched, do nothing
+  if (parent.has(basename)) return;
+
+  const listener = async (path, newStats) => {
+    if (!this.fsw._throttle(THROTTLE_MODE_WATCH, file, 5)) return;
+    if (!newStats || newStats.mtimeMs === 0) {
+      try {
+        const newStats = await stat(file);
+        if (this.fsw.closed) return;
+        // Check that change event was not fired because of changed only accessTime.
+        const at = newStats.atimeMs;
+        const mt = newStats.mtimeMs;
+        if (!at || at <= mt || mt !== prevStats.mtimeMs) {
+          this.fsw._emit(EV_CHANGE, file, newStats);
+        }
+        if (isLinux && prevStats.ino !== newStats.ino) {
+          this.fsw._closeFile(path)
+          prevStats = newStats;
+          this.fsw._addPathCloser(path, this._watchWithNodeFs(file, listener));
+        } else {
+          prevStats = newStats;
+        }
+      } catch (error) {
+        // Fix issues where mtime is null but file is still present
+        this.fsw._remove(dirname, basename);
+      }
+      // add is about to be emitted if file not already tracked in parent
+    } else if (parent.has(basename)) {
+      // Check that change event was not fired because of changed only accessTime.
+      const at = newStats.atimeMs;
+      const mt = newStats.mtimeMs;
+      if (!at || at <= mt || mt !== prevStats.mtimeMs) {
+        this.fsw._emit(EV_CHANGE, file, newStats);
+      }
+      prevStats = newStats;
+    }
+  }
+  // kick off the watcher
+  const closer = this._watchWithNodeFs(file, listener);
+
+  // emit an add event if we're supposed to
+  if (!(initialAdd && this.fsw.options.ignoreInitial) && this.fsw._isntIgnored(file)) {
+    if (!this.fsw._throttle(EV_ADD, file, 0)) return;
+    this.fsw._emit(EV_ADD, file, stats);
+  }
+
+  return closer;
+}
+
+/**
+ * Handle symlinks encountered while reading a dir.
+ * @param {Object} entry returned by readdirp
+ * @param {String} directory path of dir being read
+ * @param {String} path of this item
+ * @param {String} item basename of this item
+ * @returns {Promise<Boolean>} true if no more processing is needed for this entry.
+ */
+async _handleSymlink(entry, directory, path, item) {
+  if (this.fsw.closed) {
+    return;
+  }
+  const full = entry.fullPath;
+  const dir = this.fsw._getWatchedDir(directory);
+
+  if (!this.fsw.options.followSymlinks) {
+    // watch symlink directly (don't follow) and detect changes
+    this.fsw._incrReadyCount();
+
+    let linkPath;
+    try {
+      linkPath = await fsrealpath(path);
+    } catch (e) {
+      this.fsw._emitReady();
+      return true;
+    }
+
+    if (this.fsw.closed) return;
+    if (dir.has(item)) {
+      if (this.fsw._symlinkPaths.get(full) !== linkPath) {
+        this.fsw._symlinkPaths.set(full, linkPath);
+        this.fsw._emit(EV_CHANGE, path, entry.stats);
+      }
+    } else {
+      dir.add(item);
+      this.fsw._symlinkPaths.set(full, linkPath);
+      this.fsw._emit(EV_ADD, path, entry.stats);
+    }
+    this.fsw._emitReady();
+    return true;
+  }
+
+  // don't follow the same symlink more than once
+  if (this.fsw._symlinkPaths.has(full)) {
+    return true;
+  }
+
+  this.fsw._symlinkPaths.set(full, true);
+}
+
+_handleRead(directory, initialAdd, wh, target, dir, depth, throttler) {
+  // Normalize the directory name on Windows
+  directory = sysPath.join(directory, EMPTY_STR);
+
+  if (!wh.hasGlob) {
+    throttler = this.fsw._throttle('readdir', directory, 1000);
+    if (!throttler) return;
+  }
+
+  const previous = this.fsw._getWatchedDir(wh.path);
+  const current = new Set();
+
+  let stream = this.fsw._readdirp(directory, {
+    fileFilter: entry => wh.filterPath(entry),
+    directoryFilter: entry => wh.filterDir(entry),
+    depth: 0
+  }).on(STR_DATA, async (entry) => {
+    if (this.fsw.closed) {
+      stream = undefined;
+      return;
+    }
+    const item = entry.path;
+    let path = sysPath.join(directory, item);
+    current.add(item);
+
+    if (entry.stats.isSymbolicLink() && await this._handleSymlink(entry, directory, path, item)) {
+      return;
+    }
+
+    if (this.fsw.closed) {
+      stream = undefined;
+      return;
+    }
+    // Files that present in current directory snapshot
+    // but absent in previous are added to watch list and
+    // emit `add` event.
+    if (item === target || !target && !previous.has(item)) {
+      this.fsw._incrReadyCount();
+
+      // ensure relativeness of path is preserved in case of watcher reuse
+      path = sysPath.join(dir, sysPath.relative(dir, path));
+
+      this._addToNodeFs(path, initialAdd, wh, depth + 1);
+    }
+  }).on(EV_ERROR, this._boundHandleError);
+
+  return new Promise(resolve =>
+    stream.once(STR_END, () => {
+      if (this.fsw.closed) {
+        stream = undefined;
+        return;
+      }
+      const wasThrottled = throttler ? throttler.clear() : false;
+
+      resolve();
+
+      // Files that absent in current directory snapshot
+      // but present in previous emit `remove` event
+      // and are removed from @watched[directory].
+      previous.getChildren().filter((item) => {
+        return item !== directory &&
+          !current.has(item) &&
+          // in case of intersecting globs;
+          // a path may have been filtered out of this readdir, but
+          // shouldn't be removed because it matches a different glob
+          (!wh.hasGlob || wh.filterPath({
+            fullPath: sysPath.resolve(directory, item)
+          }));
+      }).forEach((item) => {
+        this.fsw._remove(directory, item);
+      });
+
+      stream = undefined;
+
+      // one more time for any missed in case changes came in extremely quickly
+      if (wasThrottled) this._handleRead(directory, false, wh, target, dir, depth, throttler);
+    })
+  );
+}
+
+/**
+ * Read directory to add / remove files from `@watched` list and re-read it on change.
+ * @param {String} dir fs path
+ * @param {fs.Stats} stats
+ * @param {Boolean} initialAdd
+ * @param {Number} depth relative to user-supplied path
+ * @param {String} target child path targeted for watch
+ * @param {Object} wh Common watch helpers for this path
+ * @param {String} realpath
+ * @returns {Promise<Function>} closer for the watcher instance.
+ */
+async _handleDir(dir, stats, initialAdd, depth, target, wh, realpath) {
+  const parentDir = this.fsw._getWatchedDir(sysPath.dirname(dir));
+  const tracked = parentDir.has(sysPath.basename(dir));
+  if (!(initialAdd && this.fsw.options.ignoreInitial) && !target && !tracked) {
+    if (!wh.hasGlob || wh.globFilter(dir)) this.fsw._emit(EV_ADD_DIR, dir, stats);
+  }
+
+  // ensure dir is tracked (harmless if redundant)
+  parentDir.add(sysPath.basename(dir));
+  this.fsw._getWatchedDir(dir);
+  let throttler;
+  let closer;
+
+  const oDepth = this.fsw.options.depth;
+  if ((oDepth == null || depth <= oDepth) && !this.fsw._symlinkPaths.has(realpath)) {
+    if (!target) {
+      await this._handleRead(dir, initialAdd, wh, target, dir, depth, throttler);
+      if (this.fsw.closed) return;
+    }
+
+    closer = this._watchWithNodeFs(dir, (dirPath, stats) => {
+      // if current directory is removed, do nothing
+      if (stats && stats.mtimeMs === 0) return;
+
+      this._handleRead(dirPath, false, wh, target, dir, depth, throttler);
+    });
+  }
+  return closer;
+}
+
+/**
+ * Handle added file, directory, or glob pattern.
+ * Delegates call to _handleFile / _handleDir after checks.
+ * @param {String} path to file or ir
+ * @param {Boolean} initialAdd was the file added at watch instantiation?
+ * @param {Object} priorWh depth relative to user-supplied path
+ * @param {Number} depth Child path actually targeted for watch
+ * @param {String=} target Child path actually targeted for watch
+ * @returns {Promise}
+ */
+async _addToNodeFs(path, initialAdd, priorWh, depth, target) {
+  const ready = this.fsw._emitReady;
+  if (this.fsw._isIgnored(path) || this.fsw.closed) {
+    ready();
+    return false;
+  }
+
+  const wh = this.fsw._getWatchHelpers(path, depth);
+  if (!wh.hasGlob && priorWh) {
+    wh.hasGlob = priorWh.hasGlob;
+    wh.globFilter = priorWh.globFilter;
+    wh.filterPath = entry => priorWh.filterPath(entry);
+    wh.filterDir = entry => priorWh.filterDir(entry);
+  }
+
+  // evaluate what is at the path we're being asked to watch
+  try {
+    const stats = await statMethods[wh.statMethod](wh.watchPath);
+    if (this.fsw.closed) return;
+    if (this.fsw._isIgnored(wh.watchPath, stats)) {
+      ready();
+      return false;
+    }
+
+    const follow = this.fsw.options.followSymlinks && !path.includes(STAR) && !path.includes(BRACE_START);
+    let closer;
+    if (stats.isDirectory()) {
+      const absPath = sysPath.resolve(path);
+      const targetPath = follow ? await fsrealpath(path) : path;
+      if (this.fsw.closed) return;
+      closer = await this._handleDir(wh.watchPath, stats, initialAdd, depth, target, wh, targetPath);
+      if (this.fsw.closed) return;
+      // preserve this symlink's target path
+      if (absPath !== targetPath && targetPath !== undefined) {
+        this.fsw._symlinkPaths.set(absPath, targetPath);
+      }
+    } else if (stats.isSymbolicLink()) {
+      const targetPath = follow ? await fsrealpath(path) : path;
+      if (this.fsw.closed) return;
+      const parent = sysPath.dirname(wh.watchPath);
+      this.fsw._getWatchedDir(parent).add(wh.watchPath);
+      this.fsw._emit(EV_ADD, wh.watchPath, stats);
+      closer = await this._handleDir(parent, stats, initialAdd, depth, path, wh, targetPath);
+      if (this.fsw.closed) return;
+
+      // preserve this symlink's target path
+      if (targetPath !== undefined) {
+        this.fsw._symlinkPaths.set(sysPath.resolve(path), targetPath);
+      }
+    } else {
+      closer = this._handleFile(wh.watchPath, stats, initialAdd);
+    }
+    ready();
+
+    this.fsw._addPathCloser(path, closer);
+    return false;
+
+  } catch (error) {
+    if (this.fsw._handleError(error)) {
+      ready();
+      return path;
+    }
+  }
+}
+
+}
+
+module.exports = NodeFsHandler;
diff --git a/node_modules/chokidar/package.json b/node_modules/chokidar/package.json
new file mode 100644
index 0000000..6c3cd27
--- /dev/null
+++ b/node_modules/chokidar/package.json
@@ -0,0 +1,85 @@
+{
+  "name": "chokidar",
+  "description": "Minimal and efficient cross-platform file watching library",
+  "version": "3.5.3",
+  "homepage": "https://github.com/paulmillr/chokidar",
+  "author": "Paul Miller (https://paulmillr.com)",
+  "contributors": [
+    "Paul Miller (https://paulmillr.com)",
+    "Elan Shanker"
+  ],
+  "engines": {
+    "node": ">= 8.10.0"
+  },
+  "main": "index.js",
+  "dependencies": {
+    "anymatch": "~3.1.2",
+    "braces": "~3.0.2",
+    "glob-parent": "~5.1.2",
+    "is-binary-path": "~2.1.0",
+    "is-glob": "~4.0.1",
+    "normalize-path": "~3.0.0",
+    "readdirp": "~3.6.0"
+  },
+  "optionalDependencies": {
+    "fsevents": "~2.3.2"
+  },
+  "devDependencies": {
+    "@types/node": "^14",
+    "chai": "^4.3",
+    "dtslint": "^3.3.0",
+    "eslint": "^7.0.0",
+    "mocha": "^7.0.0",
+    "nyc": "^15.0.0",
+    "rimraf": "^3.0.0",
+    "sinon": "^9.0.1",
+    "sinon-chai": "^3.3.0",
+    "typescript": "~4.4.3",
+    "upath": "^1.2.0"
+  },
+  "files": [
+    "index.js",
+    "lib/*.js",
+    "types/index.d.ts"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/paulmillr/chokidar.git"
+  },
+  "bugs": {
+    "url": "https://github.com/paulmillr/chokidar/issues"
+  },
+  "license": "MIT",
+  "scripts": {
+    "dtslint": "dtslint types",
+    "lint": "eslint --report-unused-disable-directives --ignore-path .gitignore .",
+    "mocha": "mocha --exit --timeout 90000",
+    "test": "npm run lint && npm run mocha"
+  },
+  "keywords": [
+    "fs",
+    "watch",
+    "watchFile",
+    "watcher",
+    "watching",
+    "file",
+    "fsevents"
+  ],
+  "types": "./types/index.d.ts",
+  "nyc": {
+    "include": [
+      "index.js",
+      "lib/*.js"
+    ],
+    "reporter": [
+      "html",
+      "text"
+    ]
+  },
+  "funding": [
+    {
+      "type": "individual",
+      "url": "https://paulmillr.com/funding/"
+    }
+  ]
+}
diff --git a/node_modules/chokidar/types/index.d.ts b/node_modules/chokidar/types/index.d.ts
new file mode 100644
index 0000000..aab8e33
--- /dev/null
+++ b/node_modules/chokidar/types/index.d.ts
@@ -0,0 +1,188 @@
+// TypeScript Version: 3.0
+
+/// <reference types="node" />
+
+import * as fs from "fs";
+import { EventEmitter } from "events";
+import { Matcher } from 'anymatch';
+
+export class FSWatcher extends EventEmitter implements fs.FSWatcher {
+  options: WatchOptions;
+
+  /**
+   * Constructs a new FSWatcher instance with optional WatchOptions parameter.
+   */
+  constructor(options?: WatchOptions);
+
+  /**
+   * Add files, directories, or glob patterns for tracking. Takes an array of strings or just one
+   * string.
+   */
+  add(paths: string | ReadonlyArray<string>): this;
+
+  /**
+   * Stop watching files, directories, or glob patterns. Takes an array of strings or just one
+   * string.
+   */
+  unwatch(paths: string | ReadonlyArray<string>): this;
+
+  /**
+   * Returns an object representing all the paths on the file system being watched by this
+   * `FSWatcher` instance. The object's keys are all the directories (using absolute paths unless
+   * the `cwd` option was used), and the values are arrays of the names of the items contained in
+   * each directory.
+   */
+  getWatched(): {
+    [directory: string]: string[];
+  };
+
+  /**
+   * Removes all listeners from watched files.
+   */
+  close(): Promise<void>;
+
+  on(event: 'add'|'addDir'|'change', listener: (path: string, stats?: fs.Stats) => void): this;
+
+  on(event: 'all', listener: (eventName: 'add'|'addDir'|'change'|'unlink'|'unlinkDir', path: string, stats?: fs.Stats) => void): this;
+
+  /**
+   * Error occurred
+   */
+  on(event: 'error', listener: (error: Error) => void): this;
+
+  /**
+   * Exposes the native Node `fs.FSWatcher events`
+   */
+  on(event: 'raw', listener: (eventName: string, path: string, details: any) => void): this;
+
+  /**
+   * Fires when the initial scan is complete
+   */
+  on(event: 'ready', listener: () => void): this;
+
+  on(event: 'unlink'|'unlinkDir', listener: (path: string) => void): this;
+
+  on(event: string, listener: (...args: any[]) => void): this;
+}
+
+export interface WatchOptions {
+  /**
+   * Indicates whether the process should continue to run as long as files are being watched. If
+   * set to `false` when using `fsevents` to watch, no more events will be emitted after `ready`,
+   * even if the process continues to run.
+   */
+  persistent?: boolean;
+
+  /**
+   * ([anymatch](https://github.com/micromatch/anymatch)-compatible definition) Defines files/paths to
+   * be ignored. The whole relative or absolute path is tested, not just filename. If a function
+   * with two arguments is provided, it gets called twice per path - once with a single argument
+   * (the path), second time with two arguments (the path and the
+   * [`fs.Stats`](https://nodejs.org/api/fs.html#fs_class_fs_stats) object of that path).
+   */
+  ignored?: Matcher;
+
+  /**
+   * If set to `false` then `add`/`addDir` events are also emitted for matching paths while
+   * instantiating the watching as chokidar discovers these file paths (before the `ready` event).
+   */
+  ignoreInitial?: boolean;
+
+  /**
+   * When `false`, only the symlinks themselves will be watched for changes instead of following
+   * the link references and bubbling events through the link's path.
+   */
+  followSymlinks?: boolean;
+
+  /**
+   * The base directory from which watch `paths` are to be derived. Paths emitted with events will
+   * be relative to this.
+   */
+  cwd?: string;
+
+  /**
+   *  If set to true then the strings passed to .watch() and .add() are treated as literal path
+   *  names, even if they look like globs. Default: false.
+   */
+  disableGlobbing?: boolean;
+
+  /**
+   * Whether to use fs.watchFile (backed by polling), or fs.watch. If polling leads to high CPU
+   * utilization, consider setting this to `false`. It is typically necessary to **set this to
+   * `true` to successfully watch files over a network**, and it may be necessary to successfully
+   * watch files in other non-standard situations. Setting to `true` explicitly on OS X overrides
+   * the `useFsEvents` default.
+   */
+  usePolling?: boolean;
+
+  /**
+   * Whether to use the `fsevents` watching interface if available. When set to `true` explicitly
+   * and `fsevents` is available this supercedes the `usePolling` setting. When set to `false` on
+   * OS X, `usePolling: true` becomes the default.
+   */
+  useFsEvents?: boolean;
+
+  /**
+   * If relying upon the [`fs.Stats`](https://nodejs.org/api/fs.html#fs_class_fs_stats) object that
+   * may get passed with `add`, `addDir`, and `change` events, set this to `true` to ensure it is
+   * provided even in cases where it wasn't already available from the underlying watch events.
+   */
+  alwaysStat?: boolean;
+
+  /**
+   * If set, limits how many levels of subdirectories will be traversed.
+   */
+  depth?: number;
+
+  /**
+   * Interval of file system polling.
+   */
+  interval?: number;
+
+  /**
+   * Interval of file system polling for binary files. ([see list of binary extensions](https://gi
+   * thub.com/sindresorhus/binary-extensions/blob/master/binary-extensions.json))
+   */
+  binaryInterval?: number;
+
+  /**
+   *  Indicates whether to watch files that don't have read permissions if possible. If watching
+   *  fails due to `EPERM` or `EACCES` with this set to `true`, the errors will be suppressed
+   *  silently.
+   */
+  ignorePermissionErrors?: boolean;
+
+  /**
+   * `true` if `useFsEvents` and `usePolling` are `false`). Automatically filters out artifacts
+   * that occur when using editors that use "atomic writes" instead of writing directly to the
+   * source file. If a file is re-added within 100 ms of being deleted, Chokidar emits a `change`
+   * event rather than `unlink` then `add`. If the default of 100 ms does not work well for you,
+   * you can override it by setting `atomic` to a custom value, in milliseconds.
+   */
+  atomic?: boolean | number;
+
+  /**
+   * can be set to an object in order to adjust timing params:
+   */
+  awaitWriteFinish?: AwaitWriteFinishOptions | boolean;
+}
+
+export interface AwaitWriteFinishOptions {
+  /**
+   * Amount of time in milliseconds for a file size to remain constant before emitting its event.
+   */
+  stabilityThreshold?: number;
+
+  /**
+   * File size polling interval.
+   */
+  pollInterval?: number;
+}
+
+/**
+ * produces an instance of `FSWatcher`.
+ */
+export function watch(
+  paths: string | ReadonlyArray<string>,
+  options?: WatchOptions
+): FSWatcher;