fix: createEvent type

[marcosvega91]

fix #775

What: fix typescript type

Why: It was not correct, because you can create custom Event using createEvent function

How:

Checklist:

• Documentation added to the
  docs site
• Tests
• Typescript definitions updated
• Ready to be merged
  

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[eps1lon]

A test in types/__tests__/type-tests.ts would be nice.

[marcosvega91]

I have added the test. I have changed the type of the eventName to string

[kentcdodds]

Thanks!

[testing-library-bot]

🎉 This PR is included in version 7.24.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[eschaefer]

@marcosvega91 this seems to have broken events like this in my tests:

fireEvent( document, new KeyboardEvent('keydown', { key: 'Backspace', code: 'Backspace' }) ); 

Looking into the cause, but until I know, I need to downgrade to 7.24.3

[eps1lon]

@eschaefer Please open a new issue and fill out as much as you can of the issue template. I cannot reproduce a type-related issue with your code: https://www.typescriptlang.org/play?#code/JYWwDg9gTgLgBAbzgM2FApgUQG7oHbwC+KUEIcA5AAIzoDOMweA5gLQA2wARlAIZQBPAPQZeAYxgUAUFNQYc+GAAopcOABMIYgK4hFAGlVw86AO5wA0ugFcI-dQoJKKAa2ubTeCvsRw3AgC5KACFxFzowcXRvODEIdXQgilCxcMixaLhCAEopbIBuKSA