Get lightness of ambiance with react-native?

input = context.getContentResolver().openInputStream(uri);
/* save stream to temp file */
/* displayName is obtained from the URI */
File file = new File(context.getCacheDir(), displayName);
OutputStream output = new FileOutputStream(file);
byte[] buffer = new byte[4 * 1024]; // or other buffer size
int read;

while ((read = input.read(buffer)) != -1) {
  output.write(buffer, 0, read);
}
output.flush();

final String outputPath = file.getAbsolutePath();
return outputPath;

npm install prop-types --save

import PropTypes from 'prop-types';

ThirdSquareView.propTypes = {
  exampleProp: PropTypes.string
}

include ':app'
include ':bugsnag-react-native'
project(':bugsnag-react-native').projectDir = new File(rootProject.projectDir, '../node_modules/bugsnag-react-native/android')

libz.tbd and 
libBugsnagReactNative.a

protected List<ReactPackage> getPackages() {
    return Arrays.<ReactPackage>asList(
new MainReactPackage(), BugsnagReactNative.getPackage()

state = {
    shouldRenderWebview: false,
    authorization: ''
...

auth()
      .currentUser.getIdTokenResult()
      .then(result => {
        this.setState({
          authorization: result.token,
          shouldRenderWebview: true,
        });
      })

const Authorization = 'Bearer ' + this.state.authorization;
<WebView
   source={{
     uri: this.state.urlToGo,
     headers: {
       Authorization,
     },
   }}
   ....

firebase.auth().verifyIdToken(req.headers.authorization.substr(7));