Removing already gone function from stylelint declaration

[lucavb]

This removes an already removed function from the type definitions for stylelint. This function has been removed from the code in version 12. This to me feels like a breaking change since we are removing an exported function from the definition, yet it also has been removed since two major versions already, aka users have already noticed that it doesn't work. Yet, I am not sure what the procedure then is for this package. Clarification would be welcome :)

Also I ran prettier over the files and removed some | undefined since the testing stepped asked me to. You can see the message of the testing tool in the commit message.

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change.
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm test <package to test>.

Select one of these and delete the others:

If changing an existing definition:

• Provide a URL to documentation or source code which provides context for the suggested changes:
  Remove createRuleTester API stylelint/stylelint#4385
  https://github.com/stylelint/stylelint/releases/tag/12.0.0

• If this PR brings the type definitions up to date with a new version of the JS library, update the version number in the header.

[typescript-bot]

@lucavb Thank you for submitting this PR!

This is a live comment which I will keep updated.

1 package in this PR

• stylelint — on npm, on unpkg
  • owner-approval: @bmatcuk

Code Reviews

Because you edited one package and updated the tests (👏), I can help you merge this PR once someone else signs off on it.

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• ✅ No merge conflicts
• ✅ Continuous integration tests have passed
• ✅ Most recent commit is approved by type definition owners or DT maintainers

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---

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[typescript-bot]

🔔 @alan-agius4 @filipsalpe @43081j @bmatcuk — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

[bmatcuk]

lgtm =)

[typescript-bot]

@lucavb: Everything looks good here. I am ready to merge this PR (at 8c8ad15) on your behalf whenever you think it's ready.

If you'd like that to happen, please post a comment saying:

Ready to merge

and I'll merge this PR almost instantly. Thanks for helping out! ❤️

(@alan-agius4, @filipsalpe, @43081j, @bmatcuk: you can do this too.)

[lucavb]

Ready to merge