Document sourcemap support for transforms

[SimenB]

Do you want to request a feature or report a bug?
Docs change.

What is the current behavior?
The added sourcemap support in #3458 is not documented, see http://facebook.github.io/jest/docs/en/configuration.html#transform-object-string-string.

/cc @felipeochoa

If the current behavior is a bug, please provide the steps to reproduce and
either a repl.it demo through https://repl.it/languages/jest or a minimal
repository on GitHub that we can yarn install and yarn test.
N/A

What is the expected behavior?
It might be enough to update e.g. the typescript example, or create a separate example entirely. I had to read the issue description of #3458 to know that I can return {source: '', map: ''}.

Please provide your exact Jest configuration and mention your Jest, node,
yarn/npm version and operating system.
N/A

[ryzokuken]

I'd like to pick this up as my first contribution to the project. Could anyone guide me with this?

EDIT: @felipeochoa is already working on this. Sorry, I should've noticed.

[SimenB]

@ryzokuken feel free to PR some details about {code, map} return type of transformers here: https://github.com/facebook/jest/blob/af191108302c719475aa34028a4ed46589b4cb9c/docs/Configuration.md#transform-objectstring-string

[ryzokuken]

Will do, thanks a lot.

…

On Sun 11 Feb, 2018, 8:18 PM Simen Bekkhus, ***@***.***> wrote: @ryzokuken <https://github.com/ryzokuken> feel free to PR some details about {code, map} return type of transformers here: https://github.com/facebook/jest/blob/af191108302c719475aa34028a4ed46589b4cb9c/docs/Configuration.md#transform-objectstring-string — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#5113 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AMg3MjIfe08gMnijxmyKDIiALLvAQXFHks5tTv2pgaJpZM4RFstR> .

[GeeWee]

We're using the new API in ts-jest if you're looking for an example.

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[SimenB]

Documented at https://jestjs.io/docs/code-transformation via #10834

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