Add TS support and use babel to transpile newer features. #1989
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Babel can be used to transpile stuff like
a ??= b
andObject.hasOwn
removing the need for PR's such as #1796.This can also help with #1591 becoming more feasible.
and typescript is just a good standard to have support for, with the changes to the builder being so hard wrapped its not worth merging just one or the other.