Save an image to the smartphone

I test some frameworks, one of them is reactnative. Thatswhy I write some “simple” testapps.

I tried for hours to save an image, which I have taken with ImagePicker. It is important for me not to save it immediatly after it is taken. It should work on both plattforms.

My last try:

import React from 'react';
import { StyleSheet, Text, View, Button, Image } from 'react-native';

import expo from 'expo';

import { ImageStore } from 'react-native';

export default class App extends React.Component {
    this.state = {
      imageSRC : null,
      width: null,
      height: null,
      base64: null,

  takeAPicture = async() => {
    let x = await Expo.ImagePicker.launchCameraAsync({
      allowsEditing: true,      
      aspect: [16,9],
      base64: true,


      imageSRC: x.uri,
      width: x.width,
      height: x.height,
      base64: x.base64

  saveThePicture = async()=>{

      let filename = expo.FileSystem.documentDirectory + "AppPic.jpg"



try {
  await expo.Filesystem.writeAsStringAsync(filename, this.state.base64 ).then(
    ()=>{console.log("Yes it is fin!")}
} catch (error) {
  render() {
    return (
      <View style={styles.container}>
        <Text>Open up App.js to start working on your app!</Text>
        <Text>Changes you make will automatically reload.</Text>
        <Image source = {{uri : this.state.imageSRC}} style={{ width: this.state.width, height: this.state.height }} />
        <Button onPress={this.takeAPicture} title="Make a Picture"/>
        <Button onPress={this.saveThePicture} title="Save the Picture"/>

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',

I also had some tries with ImageStore (BTW: Is ImageStore written in TypeScript?), but didn’t get anything to work. Maybe I need a hint for idiots.

greeting from my package.json

"dependencies": {
    "expo": "^22.0.2",
    "react": "16.0.0-beta.5",
    "react-native": "^0.49.5"

I hope you have all information you need for helping me.
Best regards

Did you mess with dependencies yourself by hand?

Your react-native should be more like "react-native": "",

(No typescript in react-native or expo code base)

No, didn’t made anything at dependencies except npm update. But I think that shouldn’t make the trouble, even if that is not the recommended way to update the files.