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I rember reading that  2.0 run on a different js engine  that 2.1 anyone have a link to that

<https://www.netsuite.com/blog/graal-runtime-technology-improves-netsuite-platform-developer-productivity>

search for this in help pages `Differences Between SuiteScript 2.0 and SuiteScript 2.1`

they hide most of the graal specific stuff

you can only tell in code via the existence of Graal globals that can't be hidden by flags

Rhino, though probably an older version of it

if you meant javascript versions, 2.0 uses ECMAScript 5