firebase-fileupload.js

import uuid from 'uuid';
import * as firebase from 'firebase';
import 'firebase/firestore';

firebase.initializeApp(config);
firebase.firestore().settings({ timestampsInSnapshots: true });

const uploadFileAsync = async (uri) => {
  const ext = uri.split('.').slice(-1)[0];
  const path = `file/${this.uid}/${uuid.v4()}.${ext}`;

  return new Promise(async (resolve, reject) => {
    const blob = await fetch(uri).then(response => response.blob());

    const ref = firebase.storage().ref(path);
    const unsubscribe = ref.put(blob).on('state_changed',
      (state) => { },
      (err) => {
        unsubscribe();
        reject(err);
      },
      async () => {
        unsubscribe();
        const url = await ref.getDownloadURL();
        resolve(url);
      });
  });
}