let rnfbURI = RNFetchBlob.wrap(image.uri)
Blob
    .build(rnfbURI, { type : 'image/png;'})
    .then((blob) => {
      // upload image using Firebase SDK
      firebase.storage()
        .ref()
        .child('images/')
        .put(blob, { contentType : 'image/jpg' })
        .then((snapshot) => {

      }).catch((error) => {
          console.log(error);
              Alert.alert(error);

        })
    });