text: /**
   * uriToBlob resolves a URI to a Blob object. This is used for
   * React Native to retrieve a file (identified by a file://
   * URI) as a blob.
   */
  export default function uriToBlob (uri) {
    return new Promise((resolve, reject) => {
      const xhr = new XMLHttpRequest()
      xhr.responseType = 'blob'
      xhr.onload = () => {
        const blob = xhr.response
        resolve(blob)
      }
      xhr.onerror = (err) => {
        reject(err)
      }
      xhr.open('GET', uri)
      xhr.send()
    })
  }
  