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NetSuite Professionals

Are there any JS functions that were deprecated in 2.1 but work in 2.0?
If not, why didn't Netsuite update the 2.0 API to be compatible with ES6 instead of making the user change the script type to use 2.1 to access ES6?

they switched javascript engines to get to 2.1

and there are <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_158755248128.html|Differences Between SuiteScript 2.0 and SuiteScript 2.1>

normally this level of changes should trigger a major version bump under semantic versioning

they haven't and now they have to opt in users who thought netsuite knew how to use semantic versioning