Refactor #1832 - Added EventBus

src/components/utils/PrimeEventBus.js

@@ -0,0 +1,27 @@
+function handler() {
+    let eventTarget = document.body.appendChild(document.createComment(''));
+    let eventListener, eventKey;
+
+    return {
+        on(type, listener, key) {
+            eventKey = key;
+            eventListener = function(e) { listener(e.detail); };
+            eventTarget.addEventListener(type, eventListener);
+        },
+        once(type, listener, key) {
+            eventKey = key;
+            eventListener = function(e) { listener(e.detail); };
+            eventTarget.addEventListener(type, eventListener, { once: true });
+        },
+        off(type, key) {
+            if (eventListener && eventKey === key) {
+                eventTarget.removeEventListener(type, eventListener);
+            }
+        },
+        emit(type, detail) {
+            eventTarget.dispatchEvent(new CustomEvent(type, { detail }));
+        }
+    }
+}
+
+export const PrimeEventBus = handler();