[WIP] Transformers as modules

[yordis]

Summary

Related to #7135

Test plan

[yordis]

@SimenB I probably facing the issue that you mentioned about serializing the config back and forward because this line keep failing https://github.com/facebook/jest/blob/8a7b4a9df0759142d148cf2f69ec3f23457c542e/packages/jest-runtime/src/script_transformer.js#L161

I checked my object and my keys gets clean up

My original object is

{ canInstrument: true,
  getCacheKey: [Function: getCacheKey],
  process: [Function: process] }

But there is only

{ canInstrument: true }

Which I am assuming that somebody in the middle is cleaning up the object somehow.

But, two things

1. How can I at least throw an error so I can see the stack trace and trace back how I got there. Right now it is painful to figure out things because my console keeps getting cleaning up.

2. How can I turn this auto terminal cleaning up thing?

Give me some directions please.

[yordis]

Up to this point the config is fine https://github.com/facebook/jest/blob/d481defb350947eba0ebb0e597f7c67e13fd6159/packages/jest-cli/src/reporters/coverage_reporter.js#L171

When the worker starts here https://github.com/facebook/jest/blob/d481defb350947eba0ebb0e597f7c67e13fd6159/packages/jest-cli/src/reporters/coverage_worker.js#L36

I can't see my console logs so I can't verify that the serialization is happening fine but probably the issue is there.

I never deal with workers before so I am not sure what to do

[jharris4]

Hi there, just letting you know I just made a PR that looks pretty similar to this one: #7398

[yordis]

@jharris4 it seems that you got further than me maybe I should close this one if you believe you are almost done.

Thoughts?!

[jharris4]

@yordis My PR adds the feature that I need to make using jest simple and easy for my use cases. So in that sense it is "done". :-)

I don't have a strong opinion on whether your PR should be closed in favour of mine, but perhaps you could take a look at my PR and let me know if there's anything it's missing for your requirements?

[yordis]

Closing in favor of #7398

[rickhanlonii]

Thanks @yordis!

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