state freeze done

.eslintrc

@@ -34,6 +34,7 @@
     "new-parens": "error",
     "no-bitwise": "off",
     "no-extra-boolean-cast": "off",
+    "no-prototype-builtins": "off",
     "no-restricted-imports": ["error", "rxjs/Rx"],
     "no-shadow": [
       "error",

README.md

@@ -519,7 +519,7 @@ as a state management solution.
 ## V1.0.0 To-Do List
 
 - Selector composition ✔️
-- State immutability runtime checks
+- State immutability runtime checks ✔️
 - Support for lazy loading feature modules ✔️
 
 ## Support

projects/juliette-ng/package.json

@@ -1,8 +1,8 @@
 {
   "name": "juliette-ng",
-  "version": "0.11.2",
+  "version": "0.12.0",
   "peerDependencies": {
-    "juliette": "0.11.2",
+    "juliette": "0.12.0",
     "@angular/core": "^10.0.5",
     "rxjs": "^6.5.5"
   },

projects/juliette-react/package.json

@@ -1,10 +1,10 @@
 {
   "name": "juliette-react",
-  "version": "0.11.2",
+  "version": "0.12.0",
   "main": "public-api.js",
   "types": "public-api.d.ts",
   "peerDependencies": {
-    "juliette": "0.11.2",
+    "juliette": "0.12.0",
     "react": "^16.13.1"
   }
 }

projects/juliette/package.json

@@ -1,6 +1,6 @@
 {
   "name": "juliette",
-  "version": "0.11.2",
+  "version": "0.12.0",
   "main": "public-api.js",
   "types": "public-api.d.ts",
   "peerDependencies": {

projects/juliette/src/lib/helpers.ts

@@ -0,0 +1,9 @@
+export const deepFreeze = (obj: any): any => {
+  if (!Object.isFrozen(obj)) Object.freeze(obj);
+
+  for (const key in obj) {
+    if (obj && obj.hasOwnProperty(key) && typeof obj[key] === 'object') deepFreeze(obj[key]);
+  }
+
+  return obj;
+};

projects/juliette/src/lib/store.ts

@@ -2,18 +2,18 @@ import { BehaviorSubject, Observable, Subject } from 'rxjs';
 import { distinctUntilChanged, map } from 'rxjs/operators';
 import { Handler, Selector } from './models';
 import { log } from './log';
+import { deepFreeze } from './helpers';
 
 export class Store<T> {
   private state: BehaviorSubject<T>;
   private handlers = new Subject<Handler<any, any>>();
 
   state$: Observable<T>;
-  handlers$: Observable<Handler<any, any>>;
+  handlers$ = this.handlers.asObservable();
 
   constructor(initialState: T) {
-    this.state = new BehaviorSubject(initialState);
+    this.state = new BehaviorSubject(deepFreeze(initialState));
     this.state$ = this.state.asObservable();
-    this.handlers$ = this.handlers.asObservable();
   }
 
   dispatch(handler: Handler<any, any>): void {
@@ -22,7 +22,7 @@ export class Store<T> {
 
       this.state.next({
         ...this.state.value,
-        [handler.featureKey]: handler.reducer(currentState, handler.payload),
+        [handler.featureKey]: handler.reducer(deepFreeze(currentState), handler.payload),
       });
     }
 
@@ -43,7 +43,7 @@ export class Store<T> {
   }
 
   addFeatureState(featureKey: keyof T, initialState: T[keyof T]): void {
-    this.state.next({ ...this.state.value, [featureKey]: initialState });
+    this.state.next({ ...this.state.value, [featureKey]: deepFreeze(initialState) });
   }
 }