I wouldn't call PureScript a framework. It's a compile-to-JS language. It may be useful for people that already know Haskell pretty well, but I can't see why a Javascript developper would choose to use this language. It's a completely new syntax and way of thinking about programming, which you can't pick up in less than a couple of weeks at least, unless you are already familiar with a functionnal programming language.

Purescript is a language, not a framework.