Question: > 
> ReferenceError: localStorage is not defined
> 
> 
> File: "finle:///data/data/org.nativescript/dist/index.js. line 104,
>  column: 40
> 
> 
> StackTrace: Frame:
>  function:'exports.localStorageSync',file:'file:///data/data/org.nativescript.MyApp/files/app/tns\_modules/ngrx-store-localstorage/dist/index.js',line:104,column:41
>  Frame:
>  finction:",file:'file:///data/data/org.nativescript.MyApp/files/app/core/store/index.js',line:19,column:69
> 
> 
> 

Is it must to use <https://www.npmjs.com/package/nativescript-localstorage>
or Can we use <https://github.com/natural-apptitude/ngrx-store-ionic-storage>
or ngrx-store-localstorage

Answer: 
NativeScript doesn't have LocalStorage. You have to install a shim.

```
tns plugin add nativescript-localstorage

```

Then at the top of your `app.module.ts` before you initialize ngrx:

```
import 'nativescript-localstorage';

```

This should allow ngrx-store-localstorage to work.

Read the docs at:
<https://github.com/NathanaelA/nativescript-localstorage>
you have to do three steps

1 install the plugin

```
tns plugin add nativescript-localstorage

```

2 import it in app.module.ts

```
import 'nativescript-localstorage';

```

3 use it in the corresponding component

```
import { Component, OnInit } from "@angular/core";
import { DataService, IDataItem } from "../core/data.service";
require( "nativescript-localstorage" );
@Component({
....
})

 export class HomeComponent implements OnInit {
 ......
}

```