npm and error messages

node_modules/sockjs-client/lib/utils/browser-crypto.js

@@ -0,0 +1,17 @@
+'use strict';
+
+if (global.crypto && global.crypto.getRandomValues) {
+  module.exports.randomBytes = function(length) {
+    var bytes = new Uint8Array(length);
+    global.crypto.getRandomValues(bytes);
+    return bytes;
+  };
+} else {
+  module.exports.randomBytes = function(length) {
+    var bytes = new Array(length);
+    for (var i = 0; i < length; i++) {
+      bytes[i] = Math.floor(Math.random() * 256);
+    }
+    return bytes;
+  };
+}