iansinnott

/**
 * Read the text contents of a File or Blob using the FileReader interface.
 * This is an async interface so it makes sense to handle it with Rx.
 * @param {blob} File | Blob
 * @return Observable<string>
 */
const readFile = (blob) => Observable.create(obs => {
  if (!(blob instanceof Blob)) {
    obs.error(new Error('`blob` must be an instance of File or Blob.'));
    return;