Unfortunately you can't solve this with SJS.
While SJS code can be called from non-SJS code, the calling code will
still need to be callback based. So for your particular case, where
you basically want to get a synchronous version of an asynchronous
API, introducing SJS down the line doesn't help at all. What you'd
really want is the flash application code to be SJS-based (which I
understand is not possible).
My best advice would be to try to use
instead of IndexedDB.
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