feature request: --findRelatedTests --coverage collects coverage for given files only

[aaronabramov]

this should probably be a completely different CLI flag.
What i'm looking for is more like:

jest --generateCoverageForFiles file1.js file2.js

which will be equivalent of:

jest --findRelatedTests file1.js file2.js --coverage --collectCoverageForm file1.js --collectCoverageFrom file2js

This will simplify and speed up arc unit and arc diff that currently instrument and collect coverage for every single file that's required

[stipsan]

Is there a reason why it should be a separate flag?

If it could be built in to the --coverage flags behavior I think it might be more in line with what userland expects, based on issues like #5432 and #2256

And it would be super nice if it becomes possible to do things like jest --coverage --changedSince=master and other interesting tooling opportunities. (and avoid this kind of uglyness)

In any case I'm just here to notify you that I'm going to take stab at this. If I shouldn't then I hope you'll let me know 😄

[SimenB]

Make sure to take a look at #4246.

Would love to have this feature! 🙂

[stipsan]

Thanks @SimenB! Through your link I found an answer to why a separate flag is proposed here: #4246 (comment)

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