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TypeScript enhancements outside of the types just track ECMA6. It does not have backwards-compatible iterators yet though, and you will probably have to wait a while.

https://github.com/google/traceur-compiler

Requires a runtime, though.

It can be precompiled but it has not been optimized to do so: https://github.com/google/traceur-compiler/issues/307 It seems the project is not very active.

It requires a runtime even after compiling: https://github.com/google/traceur-compiler/wiki/CompillingOf...

> The code generated by Traceur depends on a small runtime library containing Javascript code for things like creating classes, handling spread arguments, etc. To use code compiled from Traceur, you'll need to include that too.

That doesn't sound so bad if it works well, though, right? Kind of like including jQuery so you get cross-browser code.

How about Traceur? https://github.com/google/traceur-compiler