npm and error messages

node_modules/killable/index.js

@@ -0,0 +1,24 @@
+module.exports = function makeKillable(server) {
+  var sockets = [];
+
+  server.on('connection', function (socket) {
+    //add socket to list
+    sockets.push(socket);
+
+    socket.once('close', function () {
+      //remove socket from list
+      sockets.splice(sockets.indexOf(socket), 1);
+    });
+  });
+
+  server.kill = function (cb) {
+    server.close(cb);
+    sockets.forEach(function (socket) {
+      socket.destroy();
+    });
+    // reset so the server can be restarted
+    sockets = [];
+  };
+
+  return server;
+};