[Webkit-unassigned] [Bug 156613] New: Cannot access the SQLTransaction.constructor.prototype

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156613

            Bug ID: 156613
           Summary: Cannot access the SQLTransaction.constructor.prototype
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d.camata at gmail.com

In any other browser, I can access and modify SQLTransaction.constructor.prototype, like this:

> var db = openDatabase('mydb', '1.0', 'my first database', 2 * 1024 * 1024);
< undefined
> db.transaction(function (tx) { console.log(tx.constructor.prototype) });
< undefined
-> SQLTransaction {Symbol(Symbol.toStringTag): "SQLTransaction"}

The reason I do this is mostly to add a sinonjs spy to the executeSql method for some tests. 

But when I try to do this with Safari I get a "TypeError: Attempted to wrap undefined property executeSql as function". I investigated a little bit and I saw that when I run this code inside Safari I don't get anything logged to my console. These are the options I tried:

> db.transaction(function (tx) { console.log(tx.constructor.prototype) });
< undefined
> db.transaction(function (tx) { console.log(tx.constructor) });
< undefined
> db.transaction(function (tx) { console.log(tx) });
< undefined

This is very awkward. All these examples works flawlessly in other browsers. Then I tried to get the transaction outside from the function, just for curiosity and I noticed something even more weird:

> db.transaction(function (tx) { global_transaction = tx });
< undefined
> global_transaction.constructor
< function Object() {
    [native code]
} = $3
> global_transaction.constructor.prototype
< {} = $2

Now I can access the constructor, but the prototype is empty. Because of this I can't properly test my code, which uses a lot of webSQL. 

Do you think this also has some interference with IndexedDB? Exactly ALL my tests using IndexedDB fails only on Safari too, but I still have to debug them a little bit more to correctly understand what is going on. 

Note: this is my first bug report here, so if it's not good enough feel free to give suggestions on how to improve it. Thanks!

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