I wouldn't say all the JS mainstays are gone. In fact, most STS programs have little to no type annotations, so it very much looks like javascript still. The dy

I wouldn't say all the JS mainstays are gone. In fact, most STS programs have little to no type annotations, so it very much looks like javascript still. The dynamic parts like eval() and "new function" are gone, but the others you mentioned could likely be added in the future. Date() for example isn't added because STS mostly targets MCUs which don't typically have persistent time. STS was designed and built to target MCUs for educational purposes. It's actually incompatible with pretty much every NPM package out there TypeScript or not, because 99% of those can't fit or run on an MCU.