packages/node_modules/pouchdb-binary-utils/src/readAsArrayBuffer.js

// simplified API. universal browser support is assumed
function readAsArrayBuffer(blob, callback) {
  if (typeof FileReader === 'undefined') {
    // fix for Firefox in a web worker:
    // https://bugzilla.mozilla.org/show_bug.cgi?id=901097
    return callback(new FileReaderSync().readAsArrayBuffer(blob));
  }

  var reader = new FileReader();
  reader.onloadend = function (e) {
    var result = e.target.result || new ArrayBuffer(0);
    callback(result);
  };
  reader.readAsArrayBuffer(blob);
}

export default readAsArrayBuffer;