build: Add some required modules for node

1 files changed, 743 insertions, 0 deletions

diff --git a/node_modules/chokidar/index.js b/node_modules/chokidar/index.js
new file mode 100644
index 0000000..121703a
--- /dev/null
+++ b/node_modules/chokidar/index.js
@@ -0,0 +1,743 @@
+'use strict';
+var EventEmitter = require('events').EventEmitter;
+var fs = require('fs');
+var sysPath = require('path');
+var asyncEach = require('async-each');
+var anymatch = require('anymatch');
+var globParent = require('glob-parent');
+var isGlob = require('is-glob');
+var isAbsolute = require('path-is-absolute');
+var inherits = require('inherits');
+var braces = require('braces');
+var normalizePath = require('normalize-path');
+var upath = require('upath');
+
+var NodeFsHandler = require('./lib/nodefs-handler');
+var FsEventsHandler = require('./lib/fsevents-handler');
+
+var arrify = function(value) {
+  if (value == null) return [];
+  return Array.isArray(value) ? value : [value];
+};
+
+var flatten = function(list, result) {
+  if (result == null) result = [];
+  list.forEach(function(item) {
+    if (Array.isArray(item)) {
+      flatten(item, result);
+    } else {
+      result.push(item);
+    }
+  });
+  return result;
+};
+
+// Little isString util for use in Array#every.
+var isString = function(thing) {
+  return typeof thing === 'string';
+};
+
+// Public: Main class.
+// Watches files & directories for changes.
+//
+// * _opts - object, chokidar options hash
+//
+// Emitted events:
+// `add`, `addDir`, `change`, `unlink`, `unlinkDir`, `all`, `error`
+//
+// Examples
+//
+//  var watcher = new FSWatcher()
+//    .add(directories)
+//    .on('add', path => console.log('File', path, 'was added'))
+//    .on('change', path => console.log('File', path, 'was changed'))
+//    .on('unlink', path => console.log('File', path, 'was removed'))
+//    .on('all', (event, path) => console.log(path, ' emitted ', event))
+//
+function FSWatcher(_opts) {
+  EventEmitter.call(this);
+  var opts = {};
+  // in case _opts that is passed in is a frozen object
+  if (_opts) for (var opt in _opts) opts[opt] = _opts[opt];
+  this._watched = Object.create(null);
+  this._closers = Object.create(null);
+  this._ignoredPaths = Object.create(null);
+  Object.defineProperty(this, '_globIgnored', {
+    get: function() { return Object.keys(this._ignoredPaths); }
+  });
+  this.closed = false;
+  this._throttled = Object.create(null);
+  this._symlinkPaths = Object.create(null);
+
+  function undef(key) {
+    return opts[key] === undefined;
+  }
+
+  // Set up default options.
+  if (undef('persistent')) opts.persistent = true;
+  if (undef('ignoreInitial')) opts.ignoreInitial = false;
+  if (undef('ignorePermissionErrors')) opts.ignorePermissionErrors = false;
+  if (undef('interval')) opts.interval = 100;
+  if (undef('binaryInterval')) opts.binaryInterval = 300;
+  if (undef('disableGlobbing')) opts.disableGlobbing = false;
+  this.enableBinaryInterval = opts.binaryInterval !== opts.interval;
+
+  // Enable fsevents on OS X when polling isn't explicitly enabled.
+  if (undef('useFsEvents')) opts.useFsEvents = !opts.usePolling;
+
+  // If we can't use fsevents, ensure the options reflect it's disabled.
+  if (!FsEventsHandler.canUse()) opts.useFsEvents = false;
+
+  // Use polling on Mac if not using fsevents.
+  // Other platforms use non-polling fs.watch.
+  if (undef('usePolling') && !opts.useFsEvents) {
+    opts.usePolling = process.platform === 'darwin';
+  }
+
+  // Global override (useful for end-developers that need to force polling for all
+  // instances of chokidar, regardless of usage/dependency depth)
+  var envPoll = process.env.CHOKIDAR_USEPOLLING;
+  if (envPoll !== undefined) {
+    var envLower = envPoll.toLowerCase();
+
+    if (envLower === 'false' || envLower === '0') {
+      opts.usePolling = false;
+    } else if (envLower === 'true' || envLower === '1') {
+      opts.usePolling = true;
+    } else {
+      opts.usePolling = !!envLower
+    }
+  }
+  var envInterval = process.env.CHOKIDAR_INTERVAL;
+  if (envInterval) {
+    opts.interval = parseInt(envInterval);
+  }
+
+  // Editor atomic write normalization enabled by default with fs.watch
+  if (undef('atomic')) opts.atomic = !opts.usePolling && !opts.useFsEvents;
+  if (opts.atomic) this._pendingUnlinks = Object.create(null);
+
+  if (undef('followSymlinks')) opts.followSymlinks = true;
+
+  if (undef('awaitWriteFinish')) opts.awaitWriteFinish = false;
+  if (opts.awaitWriteFinish === true) opts.awaitWriteFinish = {};
+  var awf = opts.awaitWriteFinish;
+  if (awf) {
+    if (!awf.stabilityThreshold) awf.stabilityThreshold = 2000;
+    if (!awf.pollInterval) awf.pollInterval = 100;
+
+    this._pendingWrites = Object.create(null);
+  }
+  if (opts.ignored) opts.ignored = arrify(opts.ignored);
+
+  this._isntIgnored = function(path, stat) {
+    return !this._isIgnored(path, stat);
+  }.bind(this);
+
+  var readyCalls = 0;
+  this._emitReady = function() {
+    if (++readyCalls >= this._readyCount) {
+      this._emitReady = Function.prototype;
+      this._readyEmitted = true;
+      // use process.nextTick to allow time for listener to be bound
+      process.nextTick(this.emit.bind(this, 'ready'));
+    }
+  }.bind(this);
+
+  this.options = opts;
+
+  // You’re frozen when your heart’s not open.
+  Object.freeze(opts);
+}
+
+inherits(FSWatcher, EventEmitter);
+
+// Common helpers
+// --------------
+
+// Private method: Normalize and emit events
+//
+// * event     - string, type of event
+// * path      - string, file or directory path
+// * val[1..3] - arguments to be passed with event
+//
+// Returns the error if defined, otherwise the value of the
+// FSWatcher instance's `closed` flag
+FSWatcher.prototype._emit = function(event, path, val1, val2, val3) {
+  if (this.options.cwd) path = sysPath.relative(this.options.cwd, path);
+  var 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);
+
+  var awf = this.options.awaitWriteFinish;
+  if (awf && this._pendingWrites[path]) {
+    this._pendingWrites[path].lastChange = new Date();
+    return this;
+  }
+
+  if (this.options.atomic) {
+    if (event === 'unlink') {
+      this._pendingUnlinks[path] = args;
+      setTimeout(function() {
+        Object.keys(this._pendingUnlinks).forEach(function(path) {
+          this.emit.apply(this, this._pendingUnlinks[path]);
+          this.emit.apply(this, ['all'].concat(this._pendingUnlinks[path]));
+          delete this._pendingUnlinks[path];
+        }.bind(this));
+      }.bind(this), typeof this.options.atomic === "number"
+        ? this.options.atomic
+        : 100);
+      return this;
+    } else if (event === 'add' && this._pendingUnlinks[path]) {
+      event = args[0] = 'change';
+      delete this._pendingUnlinks[path];
+    }
+  }
+
+  var emitEvent = function() {
+    this.emit.apply(this, args);
+    if (event !== 'error') this.emit.apply(this, ['all'].concat(args));
+  }.bind(this);
+
+  if (awf && (event === 'add' || event === 'change') && this._readyEmitted) {
+    var awfEmit = function(err, stats) {
+      if (err) {
+        event = args[0] = 'error';
+        args[1] = err;
+        emitEvent();
+      } 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);
+        }
+        emitEvent();
+      }
+    };
+
+    this._awaitWriteFinish(path, awf.stabilityThreshold, event, awfEmit);
+    return this;
+  }
+
+  if (event === 'change') {
+    if (!this._throttle('change', path, 50)) return this;
+  }
+
+  if (
+    this.options.alwaysStat && val1 === undefined &&
+    (event === 'add' || event === 'addDir' || event === 'change')
+  ) {
+    var fullPath = this.options.cwd ? sysPath.join(this.options.cwd, path) : path;
+    fs.stat(fullPath, function(error, stats) {
+      // Suppress event when fs.stat fails, to avoid sending undefined 'stat'
+      if (error || !stats) return;
+
+      args.push(stats);
+      emitEvent();
+    });
+  } else {
+    emitEvent();
+  }
+
+  return this;
+};
+
+// Private method: Common handler for errors
+//
+// * error  - object, Error instance
+//
+// Returns the error if defined, otherwise the value of the
+// FSWatcher instance's `closed` flag
+FSWatcher.prototype._handleError = function(error) {
+  var code = error && error.code;
+  var ipe = this.options.ignorePermissionErrors;
+  if (error &&
+    code !== 'ENOENT' &&
+    code !== 'ENOTDIR' &&
+    (!ipe || (code !== 'EPERM' && code !== 'EACCES'))
+  ) this.emit('error', error);
+  return error || this.closed;
+};
+
+// Private method: Helper utility for throttling
+//
+// * action  - string, type of action being throttled
+// * path    - string, path being acted upon
+// * timeout - int, duration of time to suppress duplicate actions
+//
+// Returns throttle tracking object or false if action should be suppressed
+FSWatcher.prototype._throttle = function(action, path, timeout) {
+  if (!(action in this._throttled)) {
+    this._throttled[action] = Object.create(null);
+  }
+  var throttled = this._throttled[action];
+  if (path in throttled) {
+    throttled[path].count++;
+    return false;
+  }
+  function clear() {
+    var count = throttled[path] ? throttled[path].count : 0;
+    delete throttled[path];
+    clearTimeout(timeoutObject);
+    return count;
+  }
+  var timeoutObject = setTimeout(clear, timeout);
+  throttled[path] = {timeoutObject: timeoutObject, clear: clear, count: 0};
+  return throttled[path];
+};
+
+// Private method: Awaits write operation to finish
+//
+// * path    - string, path being acted upon
+// * threshold - int, time in milliseconds a file size must be fixed before
+//                    acknowledgeing write operation is finished
+// * awfEmit - function, to be called when ready for event to be emitted
+// Polls a newly created file for size variations. When files size does not
+// change for 'threshold' milliseconds calls callback.
+FSWatcher.prototype._awaitWriteFinish = function(path, threshold, event, awfEmit) {
+  var timeoutHandler;
+
+  var fullPath = path;
+  if (this.options.cwd && !isAbsolute(path)) {
+    fullPath = sysPath.join(this.options.cwd, path);
+  }
+
+  var now = new Date();
+
+  var awaitWriteFinish = (function (prevStat) {
+    fs.stat(fullPath, function(err, curStat) {
+      if (err || !(path in this._pendingWrites)) {
+        if (err && err.code !== 'ENOENT') awfEmit(err);
+        return;
+      }
+
+      var now = new Date();
+
+      if (prevStat && curStat.size != prevStat.size) {
+        this._pendingWrites[path].lastChange = now;
+      }
+
+      if (now - this._pendingWrites[path].lastChange >= threshold) {
+        delete this._pendingWrites[path];
+        awfEmit(null, curStat);
+      } else {
+        timeoutHandler = setTimeout(
+          awaitWriteFinish.bind(this, curStat),
+          this.options.awaitWriteFinish.pollInterval
+        );
+      }
+    }.bind(this));
+  }.bind(this));
+
+  if (!(path in this._pendingWrites)) {
+    this._pendingWrites[path] = {
+      lastChange: now,
+      cancelWait: function() {
+        delete this._pendingWrites[path];
+        clearTimeout(timeoutHandler);
+        return event;
+      }.bind(this)
+    };
+    timeoutHandler = setTimeout(
+      awaitWriteFinish.bind(this),
+      this.options.awaitWriteFinish.pollInterval
+    );
+  }
+};
+
+// Private method: Determines whether user has asked to ignore this path
+//
+// * path  - string, path to file or directory
+// * stats - object, result of fs.stat
+//
+// Returns boolean
+var dotRe = /\..*\.(sw[px])$|\~$|\.subl.*\.tmp/;
+FSWatcher.prototype._isIgnored = function(path, stats) {
+  if (this.options.atomic && dotRe.test(path)) return true;
+
+  if (!this._userIgnored) {
+    var cwd = this.options.cwd;
+    var ignored = this.options.ignored;
+    if (cwd && ignored) {
+      ignored = ignored.map(function (path) {
+        if (typeof path !== 'string') return path;
+        return upath.normalize(isAbsolute(path) ? path : sysPath.join(cwd, path));
+      });
+    }
+    var paths = arrify(ignored)
+      .filter(function(path) {
+        return typeof path === 'string' && !isGlob(path);
+      }).map(function(path) {
+        return path + '/**';
+      });
+    this._userIgnored = anymatch(
+      this._globIgnored.concat(ignored).concat(paths)
+    );
+  }
+
+  return this._userIgnored([path, stats]);
+};
+
+// Private method: Provides a set of common helpers and properties relating to
+// symlink and glob handling
+//
+// * path - string, file, directory, or glob pattern being watched
+// * depth - int, at any depth > 0, this isn't a glob
+//
+// Returns object containing helpers for this path
+var replacerRe = /^\.[\/\\]/;
+FSWatcher.prototype._getWatchHelpers = function(path, depth) {
+  path = path.replace(replacerRe, '');
+  var watchPath = depth || this.options.disableGlobbing || !isGlob(path) ? path : globParent(path);
+  var fullWatchPath = sysPath.resolve(watchPath);
+  var hasGlob = watchPath !== path;
+  var globFilter = hasGlob ? anymatch(path) : false;
+  var follow = this.options.followSymlinks;
+  var globSymlink = hasGlob && follow ? null : false;
+
+  var checkGlobSymlink = function(entry) {
+    // only need to resolve once
+    // first entry should always have entry.parentDir === ''
+    if (globSymlink == null) {
+      globSymlink = entry.fullParentDir === fullWatchPath ? false : {
+        realPath: entry.fullParentDir,
+        linkPath: fullWatchPath
+      };
+    }
+
+    if (globSymlink) {
+      return entry.fullPath.replace(globSymlink.realPath, globSymlink.linkPath);
+    }
+
+    return entry.fullPath;
+  };
+
+  var entryPath = function(entry) {
+    return sysPath.join(watchPath,
+      sysPath.relative(watchPath, checkGlobSymlink(entry))
+    );
+  };
+
+  var filterPath = function(entry) {
+    if (entry.stat && entry.stat.isSymbolicLink()) return filterDir(entry);
+    var resolvedPath = entryPath(entry);
+    return (!hasGlob || globFilter(resolvedPath)) &&
+      this._isntIgnored(resolvedPath, entry.stat) &&
+      (this.options.ignorePermissionErrors ||
+        this._hasReadPermissions(entry.stat));
+  }.bind(this);
+
+  var getDirParts = function(path) {
+    if (!hasGlob) return false;
+    var parts = [];
+    var expandedPath = braces.expand(path);
+    expandedPath.forEach(function(path) {
+      parts.push(sysPath.relative(watchPath, path).split(/[\/\\]/));
+    });
+    return parts;
+  };
+
+  var dirParts = getDirParts(path);
+  if (dirParts) {
+    dirParts.forEach(function(parts) {
+      if (parts.length > 1) parts.pop();
+    });
+  }
+  var unmatchedGlob;
+
+  var filterDir = function(entry) {
+    if (hasGlob) {
+      var entryParts = getDirParts(checkGlobSymlink(entry));
+      var globstar = false;
+      unmatchedGlob = !dirParts.some(function(parts) {
+        return parts.every(function(part, i) {
+          if (part === '**') globstar = true;
+          return globstar || !entryParts[0][i] || anymatch(part, entryParts[0][i]);
+        });
+      });
+    }
+    return !unmatchedGlob && this._isntIgnored(entryPath(entry), entry.stat);
+  }.bind(this);
+
+  return {
+    followSymlinks: follow,
+    statMethod: follow ? 'stat' : 'lstat',
+    path: path,
+    watchPath: watchPath,
+    entryPath: entryPath,
+    hasGlob: hasGlob,
+    globFilter: globFilter,
+    filterPath: filterPath,
+    filterDir: filterDir
+  };
+};
+
+// Directory helpers
+// -----------------
+
+// Private method: Provides directory tracking objects
+//
+// * directory - string, path of the directory
+//
+// Returns the directory's tracking object
+FSWatcher.prototype._getWatchedDir = function(directory) {
+  var dir = sysPath.resolve(directory);
+  var watcherRemove = this._remove.bind(this);
+  if (!(dir in this._watched)) this._watched[dir] = {
+    _items: Object.create(null),
+    add: function(item) {
+      if (item !== '.' && item !== '..') this._items[item] = true;
+    },
+    remove: function(item) {
+      delete this._items[item];
+      if (!this.children().length) {
+        fs.readdir(dir, function(err) {
+          if (err) watcherRemove(sysPath.dirname(dir), sysPath.basename(dir));
+        });
+      }
+    },
+    has: function(item) {return item in this._items;},
+    children: function() {return Object.keys(this._items);}
+  };
+  return this._watched[dir];
+};
+
+// File helpers
+// ------------
+
+// Private method: Check for read permissions
+// Based on this answer on SO: http://stackoverflow.com/a/11781404/1358405
+//
+// * stats - object, result of fs.stat
+//
+// Returns boolean
+FSWatcher.prototype._hasReadPermissions = function(stats) {
+  return Boolean(4 & parseInt(((stats && stats.mode) & 0x1ff).toString(8)[0], 10));
+};
+
+// Private method: Handles emitting unlink events for
+// files and directories, and via recursion, for
+// files and directories within directories that are unlinked
+//
+// * directory - string, directory within which the following item is located
+// * item      - string, base path of item/directory
+//
+// Returns nothing
+FSWatcher.prototype._remove = function(directory, item) {
+  // 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
+  var path = sysPath.join(directory, item);
+  var fullPath = sysPath.resolve(path);
+  var isDirectory = this._watched[path] || this._watched[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
+  var watchedDirs = Object.keys(this._watched);
+  if (!isDirectory && !this.options.useFsEvents && watchedDirs.length === 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
+  var nestedDirectoryChildren = this._getWatchedDir(path).children();
+
+  // Recursively remove children directories / files.
+  nestedDirectoryChildren.forEach(function(nestedItem) {
+    this._remove(path, nestedItem);
+  }, this);
+
+  // Check if item was on the watched list and remove it
+  var parent = this._getWatchedDir(directory);
+  var wasTracked = parent.has(item);
+  parent.remove(item);
+
+  // If we wait for this file to be fully written, cancel the wait.
+  var relPath = path;
+  if (this.options.cwd) relPath = sysPath.relative(this.options.cwd, path);
+  if (this.options.awaitWriteFinish && this._pendingWrites[relPath]) {
+    var event = this._pendingWrites[relPath].cancelWait();
+    if (event === '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
+  delete this._watched[path];
+  delete this._watched[fullPath];
+  var eventName = isDirectory ? 'unlinkDir' : '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);
+  }
+};
+
+FSWatcher.prototype._closePath = function(path) {
+  if (!this._closers[path]) return;
+  this._closers[path]();
+  delete this._closers[path];
+  this._getWatchedDir(sysPath.dirname(path)).remove(sysPath.basename(path));
+}
+
+// Public method: Adds paths to be watched on an existing FSWatcher instance
+
+// * paths     - string or array of strings, file/directory paths and/or globs
+// * _origAdd  - private boolean, for handling non-existent paths to be watched
+// * _internal - private boolean, indicates a non-user add
+
+// Returns an instance of FSWatcher for chaining.
+FSWatcher.prototype.add = function(paths, _origAdd, _internal) {
+  var disableGlobbing = this.options.disableGlobbing;
+  var cwd = this.options.cwd;
+  this.closed = false;
+  paths = flatten(arrify(paths));
+
+  if (!paths.every(isString)) {
+    throw new TypeError('Non-string provided as watch path: ' + paths);
+  }
+
+  if (cwd) paths = paths.map(function(path) {
+    var absPath;
+    if (isAbsolute(path)) {
+      absPath = path;
+    } else if (path[0] === '!') {
+      absPath = '!' + sysPath.join(cwd, path.substring(1));
+    } else {
+      absPath = sysPath.join(cwd, path);
+    }
+
+    // Check `path` instead of `absPath` because the cwd portion can't be a glob
+    if (disableGlobbing || !isGlob(path)) {
+      return absPath;
+    } else {
+      return normalizePath(absPath);
+    }
+  });
+
+  // set aside negated glob strings
+  paths = paths.filter(function(path) {
+    if (path[0] === '!') {
+      this._ignoredPaths[path.substring(1)] = true;
+    } else {
+      // if a path is being added that was previously ignored, stop ignoring it
+      delete this._ignoredPaths[path];
+      delete this._ignoredPaths[path + '/**'];
+
+      // reset the cached userIgnored anymatch fn
+      // to make ignoredPaths changes effective
+      this._userIgnored = null;
+
+      return true;
+    }
+  }, this);
+
+  if (this.options.useFsEvents && FsEventsHandler.canUse()) {
+    if (!this._readyCount) this._readyCount = paths.length;
+    if (this.options.persistent) this._readyCount *= 2;
+    paths.forEach(this._addToFsEvents, this);
+  } else {
+    if (!this._readyCount) this._readyCount = 0;
+    this._readyCount += paths.length;
+    asyncEach(paths, function(path, next) {
+      this._addToNodeFs(path, !_internal, 0, 0, _origAdd, function(err, res) {
+        if (res) this._emitReady();
+        next(err, res);
+      }.bind(this));
+    }.bind(this), function(error, results) {
+      results.forEach(function(item) {
+        if (!item || this.closed) return;
+        this.add(sysPath.dirname(item), sysPath.basename(_origAdd || item));
+      }, this);
+    }.bind(this));
+  }
+
+  return this;
+};
+
+// Public method: Close watchers or start ignoring events from specified paths.
+
+// * paths     - string or array of strings, file/directory paths and/or globs
+
+// Returns instance of FSWatcher for chaining.
+FSWatcher.prototype.unwatch = function(paths) {
+  if (this.closed) return this;
+  paths = flatten(arrify(paths));
+
+  paths.forEach(function(path) {
+    // convert to absolute path unless relative path already matches
+    if (!isAbsolute(path) && !this._closers[path]) {
+      if (this.options.cwd) path = sysPath.join(this.options.cwd, path);
+      path = sysPath.resolve(path);
+    }
+
+    this._closePath(path);
+
+    this._ignoredPaths[path] = true;
+    if (path in this._watched) {
+      this._ignoredPaths[path + '/**'] = true;
+    }
+
+    // reset the cached userIgnored anymatch fn
+    // to make ignoredPaths changes effective
+    this._userIgnored = null;
+  }, this);
+
+  return this;
+};
+
+// Public method: Close watchers and remove all listeners from watched paths.
+
+// Returns instance of FSWatcher for chaining.
+FSWatcher.prototype.close = function() {
+  if (this.closed) return this;
+
+  this.closed = true;
+  Object.keys(this._closers).forEach(function(watchPath) {
+    this._closers[watchPath]();
+    delete this._closers[watchPath];
+  }, this);
+  this._watched = Object.create(null);
+
+  this.removeAllListeners();
+  return this;
+};
+
+// Public method: Expose list of watched paths
+
+// Returns object w/ dir paths as keys and arrays of contained paths as values.
+FSWatcher.prototype.getWatched = function() {
+  var watchList = {};
+  Object.keys(this._watched).forEach(function(dir) {
+    var key = this.options.cwd ? sysPath.relative(this.options.cwd, dir) : dir;
+    watchList[key || '.'] = Object.keys(this._watched[dir]._items).sort();
+  }.bind(this));
+  return watchList;
+};
+
+// Attach watch handler prototype methods
+function importHandler(handler) {
+  Object.keys(handler.prototype).forEach(function(method) {
+    FSWatcher.prototype[method] = handler.prototype[method];
+  });
+}
+importHandler(NodeFsHandler);
+if (FsEventsHandler.canUse()) importHandler(FsEventsHandler);
+
+// Export FSWatcher class
+exports.FSWatcher = FSWatcher;
+
+// Public function: Instantiates watcher with paths to be tracked.
+
+// * paths     - string or array of strings, file/directory paths and/or globs
+// * options   - object, chokidar options
+
+// Returns an instance of FSWatcher for chaining.
+exports.watch = function(paths, options) {
+  return new FSWatcher(options).add(paths);
+};