How to use the expo-file-system.DownloadResumable function in expo-file-system

_fetchDownload = async () => {
    try {
      const downloadJson = await AsyncStorage.getItem('pausedDownload');
      if (downloadJson !== null) {
        const downloadFromStore = JSON.parse(downloadJson);
        const callback: FileSystem.DownloadProgressCallback = downloadProgress => {
          const progress =
            downloadProgress.totalBytesWritten / downloadProgress.totalBytesExpectedToWrite;
          this.setState({
            downloadProgress: progress,
          });
        };
        this.download = new FileSystem.DownloadResumable(
          downloadFromStore.url,
          downloadFromStore.fileUri,
          downloadFromStore.options,
          callback,
          downloadFromStore.resumeData
        );
        await this.download.resumeAsync();
        if (this.state.downloadProgress === 1) {
          alert('Download complete!');
        }
      } else {
        alert('Initiate a download first!');
        return;
      }
    } catch (e) {
      console.log(e);