Idea for explicit commit control in IndexedDB

script.js

// I can open a transaction in "manual commit" mode
var txn = db.transaction('mydb', 'readwrite', {commit: 'manual'}); // default: 'auto'

txn.objectStore('people').get('nolan').onsuccess = function (e) {
  var photoBlob = e.target.result.photo;
  var reader = new FileReader();
  
  // I can use FileReader inside of this transaction, and it's totally cool
  reader.onloadend = function (e) {
    var binaryString = e.target.result;
    
    // I can also use fetch() to post the base64 image, and it's totally cool
    fetch('/photos', {
      method: 'post',
      body: btoa(binaryString)
    }).then(function (response) {
      var receiptId = response.receiptId;
      // I got a receipt from the server, now I put() and commit()
      txn.objectStore('receipts').put('nolan', receiptId);
      txn.commit();
    }).catch(function (err) {
      txn.rollback();
    });
  };
  reader.onerror = function () {
    txn.rollback();
  };
  reader.readAsBinaryString(photoBlob);
};