Create a new file "eventEmitter.js" in the "src/services" directory, which exports a singleton instance of the EventEmitter for the entire application

src/services/eventEmitter.js

@@ -0,0 +1,15 @@
+// create a singleton instance of the EventEmitter for the entire application
+
+const EventEmitter = require('events');
+
+class MyEmitter extends EventEmitter {
+
+  static getInstance() {
+    if (!this.instance) {
+      this.instance = new MyEmitter();
+    }
+    return this.instance;
+  }
+}
+
+module.exports = MyEmitter.getInstance();