Trigger callback when subscribe after publish

Author: canmingir

src/Event.js

@@ -12,6 +12,12 @@ const subscribe = (type, callback) => {
 
   subscriptions[type][id] = callback;
 
+  let last = map.get(type);
+
+  if (last) {
+    callback(last);
+  }
+
   return {
     unsubscribe: () => {
       delete subscriptions[type][id];

src/test/event.test.js

@@ -14,6 +14,15 @@ describe("react-event", () => {
     publish("TEST_EVENT", { number: 10, string: "blue" });
   });
 
+  it("publishes and subscribes events", (done) => {
+    publish("TEST_EVENT", { number: 10, string: "blue" });
+
+    subscribe("TEST_EVENT", (result) => {
+      expect(result).toMatchObject({ number: 10, string: "blue" });
+      done();
+    });
+  });
+
   it("notifies all subscribers of an event", (done) => {
     let receivedByFirstSubscriber = false;
     let receivedBySecondSubscriber = false;