Why use "this"? https://medium.com/@surgeboris/thank-you-for-such-an-insightful-post-eric-39b93ef72d47

example.diff

@@ -1,13 +1,13 @@
 import Events from 'eventemitter3';
 
-const rawMixin = function () {
+const mixinModel = function (target) {
   const attrs = {};
 
-  return Object.assign(this, {
+  return Object.assign(target, {
     set (name, value) {
       attrs[name] = value;
 
-      this.emit('change', {
+      target.emit('change', {
         prop: name,
         value: value
       });
@@ -19,8 +19,6 @@ const rawMixin = function () {
   }, Events.prototype);
 };
 
-const mixinModel = (target) => rawMixin.call(target);
-
 const george = { name: 'george' };
 const model = mixinModel(george);