Show sourcemap support in typescript example

[felipeochoa]

Addresses #5113

Summary
Documentation for #3458

Test plan
Haven't added tests yet -- should add a for showing source map support in tracebacks and coverage

[SimenB]

There's no difference here for me - they both return the same stack traces and the same coverage report.

I think it's a better example for showing more code, but it seemingly makes no difference. Unless I'm misunderstanding something?

[felipeochoa]

Right -- I just added code showing how you'd provide the source maps directly. Showing the tracebacks and coverage will require adding more tests

[cpojer]

Thanks for the PR. We'd like to keep the examples simple but I encourage you to write a blog post about your findings on how to effectively use TypeScript and Jest together :)

[github-actions]

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