install gulp to process code

node_modules/sparkles/index.js

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+'use strict';
+
+var EventEmitter = require('events').EventEmitter;
+
+var sparklesNamespace = Symbol.for('sparkles:store');
+var defaultNamespace = Symbol.for('sparkles:namespace');
+
+function getStore() {
+  var store = global[sparklesNamespace];
+
+  if (!store) {
+    store = global[sparklesNamespace] = {};
+  }
+
+  return store;
+}
+
+function getEmitter(namespace) {
+  var store = getStore();
+
+  namespace = namespace || defaultNamespace;
+
+  var ee = store[namespace];
+
+  if (!ee) {
+    ee = store[namespace] = new EventEmitter();
+    ee.setMaxListeners(0);
+    ee.remove = function remove() {
+      ee.removeAllListeners();
+      delete store[namespace];
+    };
+  }
+
+  return ee;
+}
+
+function exists(namespace) {
+  var store = getStore();
+
+  return !!store[namespace];
+}
+
+module.exports = getEmitter;
+module.exports.exists = exists;