Pass ts.Program to getCustomTransformers()

[andersekdahl]

A lot of transformers requires a Program instance so we pass ts.Program to getCustomTransformers() to be able to pass it on to transformers. Transformers mostly need ts.Program in order to access the type checker.

Fixes #860

[johnnyreilly]

This looks awesome! Thanks for contributing!

It looks like the test output for the custom transformers needs regenerating. You can find instructions on how to do that here: https://github.com/TypeStrong/ts-loader/blob/master/test/comparison-tests/README.md#regenerating-test-data

[andersekdahl]

The expected test output seems correct, as it should make the string literal uppercase but it doesn't. But I get the same failing test on master as on my commit. Do you get that as well?

Looked into it briefly and the custom transformer in the tests seems to get called, but the changes are not applied.

[johnnyreilly]

As in the functionality doesn't work at all? Or just the test isn't triggering the functionality successfully?

Have you successfully used your fork locally?

I'm travelling at the moment and so can't test this myself I'm afraid...

[andersekdahl]

Never mind, I forgot to set transformers in an else branch and was running the tests without building first so I was fooled into believing that every commit had the same failing test. 😄

Hopefully works now!

[johnnyreilly]

Nice one! I'll look to merge and release when I'm back. Thanks!

[johnnyreilly]

Thanks! I'll look to ship this with ts-loader@5.3.3

[johnnyreilly]

Had hoped this was going to be my first automated deployment with GitHub Actions. Alas not:

#893

Will have to do this by hand 😥