adds test

package.json

@@ -6,6 +6,7 @@
   "types": "dist/index.d.ts",
   "scripts": {
     "test": "node clean && npx rollup -c rollup.config.js && jest",
+    "test:dev": "jest --watch",
     "pre": "npm test && npm publish --tag next",
     "safe-publish": "npm test && npm publish"
   },

src/PubSub.test.ts

@@ -51,3 +51,10 @@ test("Emitting SPEAK should call shout and not whisper", () => {
   expect(shout.mock.calls.length).toBe(3);
   expect(whisper.mock.calls.length).toBe(2);
 });
+
+test("emit without data contains empty object", () => {
+  const mockFn = jest.fn((obj) => obj);
+  pub.on("HELLO", mockFn);
+  pub.emit("HELLO");
+  expect(mockFn).toReturnWith({});
+});

src/PubSub.ts

@@ -29,7 +29,7 @@ export default class PubSub {
     }
   }
 
-  emit(eventName: string, data?: object) {
+  emit(eventName: string, data: object = {}) {
     if (this.events[eventName]) {
       this.events[eventName].forEach(function (fn) {
         fn(data);

src/index.ts

@@ -11,7 +11,7 @@ import PubSub from "./PubSub";
 const S: string = "UPDATE_STATE";
 const C: string = "CHANGE_STATE";
 
-interface IAction {
+interface IAction extends Object {
   $type?: string;
   $deep?: boolean;
   [key: string]: any;

src/substate.test.js

@@ -130,4 +130,18 @@ describe("ES5 version tests", () => {
     });
     expect(shallowStore.getCurrentState().a.b.c.d.e.f.name).toMatch("Danny");
   });
+
+  test("instance deep clone when passed reverts to false", () => {
+    shallowStore.emit("UPDATE_STATE", {
+      "a.b.c.d.e.f.name": "Charlie",
+    });
+    expect(shallowStore.getCurrentState().a.b.c.d.e.f.name).toMatch("Charlie");
+  });
+
+  test("emit without data contains empty object", () => {
+    const mockFn = jest.fn((obj) => obj);
+    shallowStore.on("HELLO", mockFn);
+    shallowStore.emit("HELLO");
+    expect(mockFn).toReturnWith({});
+  });
 });