Hi Big Cat, I use Base.js for an inheritance library and json2.js for, well, JSON support and nothing else.
When I first started using Test Complete I considered using support libraries and tried to approach developing tests as I would writing a Web app.
Honestly, the Test Complete runtime is weird, and is nothing like a Browser, I pretty much ditched every design pattern I knew and started afresh and came up with patterns more suited to the way Test Complete works.
There are also Test Complete objects like aqFile, aqDateTime, aqString etc which provide alot of the functionality JavaScript support libraries offer anyway so their usefulness for me diminished.
Regards,
Phil Baird