A fix for dates in state

+ remove yarn log .....

src/index.ts

@@ -2,15 +2,15 @@
 // import mitt from 'mitt';
 
 export type EventHandler = (event?: any) => void;
-export type WildCardEventHandler = (type: string, event?: any) => void;
-export type Handler = EventHandler | WildCardEventHandler;
+type WildCardEventHandler = (type: string, event?: any) => void;
+type Handler = EventHandler | WildCardEventHandler;
 
 // A map of event types and their corresponding event handlers.
-export type EventHandlerMap = {
+type EventHandlerMap = {
   [type: string]: Handler[];
 };
 
-export interface Emitter {
+interface Emitter {
   on(type: string, handler: Handler): void;
   off(type: string, handler: Handler): void;
   emit(type: string, evt: any): void;
@@ -20,7 +20,7 @@ export interface Emitter {
  *  @name mitt
  *  @returns {Emitter}
  */
-export function mitt(all: EventHandlerMap = Object.create(null)): Emitter {
+function mitt(all: EventHandlerMap = Object.create(null)): Emitter {
   return {
     /**
      * Register an event handler for the given type.
@@ -190,6 +190,9 @@ function cProxy<S>(
       if (prop === symbol) return true;
       if (typeof prop === 'symbol') return target[prop];
       const res = target[prop];
+      // check if there are other built in constructors that need this
+      if (target instanceof Date && typeof res === 'function')
+        return res.bind(target);
       return (
         (res != null &&
           typeof res === 'object' &&
@@ -227,7 +230,10 @@ function subscribe(emitter: Emitter, evt: string, fn: EventHandler) {
   return () => emitter.off(evt, fn);
 }
 
-function model<S>(name: string, { initial, actions, views }: ModelArgs<S>) {
+function model<S>(
+  name: string,
+  { initial, actions, views }: ModelArgs<S>
+): (obj?: object | undefined) => Model<S> {
   if (typeof initial !== 'function') {
     throw new Error(
       'You have to supply a function that returns the initial state'
@@ -368,7 +374,7 @@ function model<S>(name: string, { initial, actions, views }: ModelArgs<S>) {
   }
 
   modelMap.set(name, instantiate);
-  return (obj?: object) => instantiate(obj)[vpc];
+  return obj => instantiate(obj)[vpc];
 }
 
 export default model;

test/model.test.ts

@@ -166,6 +166,42 @@ describe('model()', function() {
     expect(sub).toBeCalled();
   });
 
+  it('should update on array methods', function() {
+    const Model = model('Model', {
+      initial: () => ({
+        arr: [] as any[],
+      }),
+      actions: self => ({
+        pushToArr(thing: any) {
+          self.arr.push(thing);
+        },
+      }),
+      views: self => ({
+        firstElem: () => self.arr[0],
+      }),
+    });
+
+    const instance = Model();
+
+    const sub = jest.fn();
+    instance.onPatch(sub);
+    instance.pushToArr(2);
+    expect(sub).toBeCalled();
+    expect(instance.firstElem).toBe(2);
+  });
+
+  it('should handle dates', function() {
+    const Model = model('Model', {
+      initial: () => ({
+        date: new Date(),
+      }),
+    });
+
+    const instance = Model();
+    instance.getSnapshot();
+    instance.date.getDate();
+  });
+
   it('should apply snapshots', function() {
     const Person = model('Person', {
       initial: () => ({

yarn-error.log

@@ -16,18 +16,19 @@ Platform:
 npm manifest: 
   {
     "name": "parket",
-    "version": "0.3.0",
+    "version": "0.4.0",
     "description": "A small reactive™ library to manage application state, heavily inspired by mobx-state-tree",
     "source": "src/index.ts",
     "typings": "dist/index.d.ts",
-    "module": "dist/parket.es.js",
+    "module": "dist/es/index.js",
     "main": "dist/parket.js",
     "umd:main": "dist/parket.umd.js",
     "scripts": {
       "test": "npm run build && npm run jest",
       "jest": "jest",
       "build": "npm-run-all --silent -p build:*",
-      "build:main": "microbundle",
+      "build:ts": "tsc",
+      "build:main": "microbundle -f umd,cjs",
       "build:integrations": "microbundle src/integration/*.js -o x.js -f cjs",
       "build:devtools": "microbundle src/devtools.js -o devtools.js -f cjs",
       "prepare": "npm t",