V2 (#1)

packages/lib/src/events.js

@@ -0,0 +1,21 @@
+class Events {
+  constructor() {
+    this.listeners = [];
+  }
+
+  listen(fn) {
+    this.listeners.push(fn);
+  }
+
+  unlisten(fn) {
+    this.listeners = this.listeners(l => l !== fn);
+  }
+
+  publish(type, data) {
+    this.listeners.forEach(l => l(type, data));
+  }
+}
+
+const events = new Events();
+
+export default events;