added observable mode

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@sovgut/state",
-  "version": "1.0.12",
+  "version": "1.0.13",
   "type": "module",
   "repository": "https://github.com/Sovgut/state.git",
   "author": {
@@ -12,6 +12,9 @@
     "test": "vitest run",
     "build": "tsc && vite build"
   },
+  "peerDependencies": {
+    "eventemitter3": "^5.0.1"
+  },
   "devDependencies": {
     "@types/node": "^20.12.13",
     "@vitest/coverage-v8": "^1.6.0",

src/modules/base/base.ts

@@ -1,8 +1,14 @@
 import { UnsupportedException } from "@/errors/unsupported/unsupported";
 import { ISupportedPrimitive, IProvider } from "@/types";
+import EventEmitter from "eventemitter3";
 
 export class BaseState {
-  static provider: IProvider | undefined = undefined;
+  private static observer = new EventEmitter()
+  public static provider: IProvider | undefined = undefined;
+
+  public static on(event: `${string}:${'set' | 'unset'}`, callback: (...args: any[]) => void): void {
+    this.observer.on(event, callback);
+  }
 
   public static get<T = unknown>(
     key: string,
@@ -47,19 +53,29 @@ export class BaseState {
 
     switch (typeof value) {
       case "bigint": {
-        return this.provider.setItem(key, value.toString());
+        this.provider.setItem(key, value.toString());
+        this.observer.emit(`${key}:set`);
+        break;
       }
       case "boolean": {
-        return this.provider.setItem(key, String(value));
+        this.provider.setItem(key, String(value));
+        this.observer.emit(`${key}:set`);
+        break; 
       }
       case "number": {
-        return this.provider.setItem(key, String(value));
+        this.provider.setItem(key, String(value));
+        this.observer.emit(`${key}:set`);
+        break; 
       }
       case "object": {
-        return this.provider.setItem(key, JSON.stringify(value));
+        this.provider.setItem(key, JSON.stringify(value));
+        this.observer.emit(`${key}:set`);
+        break; 
       }
       case "string": {
-        return this.provider.setItem(key, value);
+        this.provider.setItem(key, value);
+        this.observer.emit(`${key}:set`);
+        break; 
       }
     }
   }
@@ -70,6 +86,7 @@ export class BaseState {
     }
 
     this.provider.removeItem(key);
+    this.observer.emit(`${key}:unset`);
   }
 
   public static clear(): void {

vite.config.ts

@@ -6,6 +6,8 @@ import { URL, fileURLToPath } from "node:url";
 import { resolve } from "node:path";
 import dts from "vite-plugin-dts";
 
+import * as packageJson from './package.json'
+
 export default defineConfig({
   plugins: [dts()],
   build: {
@@ -15,6 +17,9 @@ export default defineConfig({
       entry: resolve("src", "main.ts"),
       formats: ["es"],
     },
+    rollupOptions: {
+      external: [...Object.keys(packageJson.peerDependencies)],
+    }
   },
   resolve: {
     alias: {