Commit 'Delete stubs from require cache when in noPreserveCache mode' breaks when using coffee script

[liamqma]

Hi maintainers 😄

The recent commit I think will break if using coffeescript along with '_preserveCache' set to be true.

The following code will not be able to resolve .coffee

var stubIds = Object.keys(stubs).map(function (stubPath) {
   return resolve.sync(stubPath, {
       basedir: dirname(id)
    })
});

Unless we explicitly set extension to include .coffee based on node-resolve docs

var stubIds = Object.keys(stubs).map(function (stubPath) {
   return resolve.sync(stubPath, {
       basedir: dirname(id),
       extensions: [ '.js', '.coffee' ]
    })
});

Cheers ❤️

[bendrucker]

Ah, interesting. Related to #122 but should be way easier to solve. Appreciate you doing most of the work!

I think I should be able to grab require.extensions and that CoffeeScript will add itself there.