StackNavigator in react native app -


i have created , new react native app using create-react-native-app. ended app works on expo. want add stack stacknavigator react-navigation have flowed guide reactnavigation.org , did npm install --save react-navigation in app directory. thing different did have used create-react-native-app awesomeproject instead of react-native init simpleapp.

the problem facing when remove export default fro class error check awakeindevapp:/users/alex/desktop/img_1277.png

code of app.js:

import react 'react'; import { stylesheet, text, view, appregistry, button } 'react-native'; import { stacknavigator } 'react-navigation';  export default class app extends react.component {   static navigationoptions = {     title: 'welcome',   };   render() {     return (       <view>         <text>hello, chat app!</text>         <button           onpress={() => navigate('chat')}           title="chat lucy"         />       </view>     );   } }  class chatscreen extends react.component {   static navigationoptions = {     title: 'chat lucy',   };   render() {     return (       <view>         <text>chat lucy</text>       </view>     );   } }  const simpleapp = stacknavigator({   home: { screen: app },   chat: { screen: chatscreen }, });  appregistry.registercomponent('simpleapp', () => simpleapp);

since you're using create-react-native-app, project template includes app.js , assume it's 1 mentioned in example, need remove appregistry.registercomponent('simpleapp', () => simpleapp); , replace export default simpleapp reason initialization of application done create-react-native-app , need give main component in case simpleapp navigator includes screen 

const simpleapp = stacknavigator({       home: { screen: app },       chat: { screen: chatscreen },     });

see code below full example

code of app.js:

import react 'react'; import { stylesheet, text, view, appregistry, button } 'react-native'; import { stacknavigator } 'react-navigation';  class app extends react.component {   static navigationoptions = {     title: 'welcome',   };   render() {     return (       <view>         <text>hello, chat app!</text>         <button           onpress={() => navigate('chat')}           title="chat lucy"         />       </view>     );   } }  class chatscreen extends react.component {   static navigationoptions = {     title: 'chat lucy',   };   render() {     return (       <view>         <text>chat lucy</text>       </view>     );   } }  const simpleapp = stacknavigator({   home: { screen: app },   chat: { screen: chatscreen }, });  export default simpleapp;

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