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  RaisedButton(
      child: Text("Add Item"),
      onPressed: () async {
        final form = _formKey.currentState;
        form.save();
        if (form.validate()) {
          Provider.of(context)
              .add(new Item(_name, num.parse(_price)));
        } else {
          print('validate failed');

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class TabBarDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    var count = Provider.of(context).items.length;

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import 'dart:collection';
import 'package:flutter/material.dart';

class Item {
  String name;
  num price;

  Item(this.name, this.price);
}

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void main() => runApp(
      ChangeNotifierProvider(
        child: TabBarDemo(),
        builder: (BuildContext context) {
          return CartModel();
        },
      ),
    );

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// FILE: App.tsx

 } />

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// FILE: TabRoot.tsx

interface IAppProps {}

const TabRoot: React.FC = props => {
  return (
    
      
        

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// FILE: Tab1Detail.tsx

import React from 'react';
import { IonHeader, IonToolbar, IonTitle, IonContent } from '@ionic/react';

const Tab1Detail: React.SFC = () => {
  return (
    <>
      

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// FILE: App.tsx

const App: React.SFC = () => (
  
     } />
    
      

      

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// FILE: Tab1Detail.tsx

import { withRouter } from "react-router";        // <== NEW

const Tab1Detail: React.SFC = (props) => {   // <== NEW
  return (
    <>
      
        

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// FILE: Tab1.tsx

// add the import..
import { withRouter } from "react-router";