I actually like JS myself.. it's been pretty much my favorite language for a long time (long before the good parts book)... Used it with Netscape's web server, and even in classic asp. There are still a lot of advantages to a single language across your stack. It's also a natural fit with document databases... and even Pg with v8 support. It's not the "best" of all worlds language, but it's definitely the best in terms of coverage.
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Typescript has a pretty broken type system. Subtyping done wrong (and usually is).
Get more mileage out of Haskell.
I actually like JS myself.. it's been pretty much my favorite language for a long time (long before the good parts book)... Used it with Netscape's web server, and even in classic asp. There are still a lot of advantages to a single language across your stack. It's also a natural fit with document databases... and even Pg with v8 support. It's not the "best" of all worlds language, but it's definitely the best in terms of coverage.