Custom transformer fails to import when yarn-linking unrelated child

[felipeochoa]

This is a bug report.

When running jest in a package that has both a custom transform module and a dependency that has been linked in using yarn link, jest fails to load the transformer. If the transform module is installed in the repository that is linked, the problem disappears.

There were a couple of reports of this problem in kulshekhar/ts-jest#424, but it appears the problem is with jest.

This seems related to #5085, but the test case reproduces with jest 23.0.0-alpha.1, which I think includes that PR already, so I think this is a different issue.

I've created a small reproduction repo here.

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