fixes #1208: watchOptions not passed to chokidar in wds

lib/Server.js

@@ -50,6 +50,7 @@ function Server(compiler, options) {
   this.allowedHosts = options.allowedHosts;
   this.sockets = [];
   this.contentBaseWatchers = [];
+  this.watchOptions = options.watchOptions;
 
   // Listening for events
   const invalidPlugin = () => {
@@ -663,7 +664,24 @@ Server.prototype._sendStats = function (sockets, stats, force) {
 };
 
 Server.prototype._watch = function (watchPath) {
-  const watcher = chokidar.watch(watchPath).on('change', () => {
+  // duplicate the same massaging of options that watchpack performs
+  // https://github.com/webpack/watchpack/blob/master/lib/DirectoryWatcher.js#L49
+  // this isn't an elegant solution, but we'll improve it in the future
+  const usePolling = this.watchOptions.poll ? true : undefined; // eslint-disable-line no-undefined
+  const interval = typeof this.watchOptions.poll === 'number' ? this.watchOptions.poll : undefined; // eslint-disable-line no-undefined
+  const options = {
+    ignoreInitial: true,
+    persistent: true,
+    followSymlinks: false,
+    depth: 0,
+    atomic: false,
+    alwaysStat: true,
+    ignorePermissionErrors: true,
+    ignored: this.watchOptions.ignored,
+    usePolling,
+    interval
+  };
+  const watcher = chokidar.watch(watchPath, options).on('change', () => {
     this.sockWrite(this.sockets, 'content-changed');
   });