Modificado o Storage para ser um singleton

Tracker/src/system/database/storage.js

@@ -0,0 +1,35 @@
+import AsyncStorage from "@react-native-async-storage/async-storage"
+
+export default class Storage{
+    static  #instance;
+
+    constructor(){
+        if (Storage.#instance){
+            throw new Error("Use the The getInstanceMethod instead of new")
+        }
+        
+    }
+    
+    static getInstance(){
+        if (!Storage.#instance){
+            Storage.#instance = new Storage
+        }
+        return Storage.#instance
+    }
+
+    async listData(){
+        
+        const data = await AsyncStorage.multiGet(await this.getKeys())
+        return data
+    }
+
+    async getKeys(){
+        const keys = await AsyncStorage.getAllKeys()
+        return keys;
+    }
+    
+    async saveData(index,content){
+        await AsyncStorage.setItem(index.toString(),JSON.stringify(content))
+        
+    }
+}