Full support for testEnvironment

[ssbarbee]

Since jest 22 we can specifiy a class providing setup and teardown methods for setting up the environment using the flag testEnvironment . Are there any plans for supporting this flag fully? Current behaviour is that it throws unexpected token when providing .ts files.

[kulshekhar]

This seems similar to #411

Jest will have to use the transformer to invoke those files. There's not much a transformer can do here on its own.

I'm closing this but if my understanding is incorrect, it can be reopened and re-looked at