Access event.currentTarget in upgrade function

[ChocolateLoverRaj]

Is your feature request related to a problem? Please describe. I'm trying to modify an existing store in the upgrade function, but if I do db.transaction() I get an error saying that I can't do a transaction while the db is being upgraded. I saw this article which used evt.currentTarget.transaction, which seems to be an existing transaction for upgrading the db. However, the upgrade function doesn't get the event or the current target in its parameters, so there's currently no way to get data from the db during an upgrade.

Describe the solution you'd like

Preferred solution (has breaking change)

// Upgrade function
async (db, upgradeNeededEvent) {

}

Another solution (no breaking changes)

// Upgrade function
async (db, _oldVersion, _newVersion, upgradeNeededEvent) {

}

[jakearchibald]

The 4th argument of the upgrade callback is the transaction you're looking for - https://github.com/jakearchibald/idb#opendb

const db = await openDB(name, version, {
  upgrade(db, oldVersion, newVersion, transaction) {
    // transaction is what you want
  },
});

[ChocolateLoverRaj]

@jakearchibald sorry didn't realize there was a parameter for it