fix: add message if type/paste function is called with an invalid element

[marcosvega91]

What:

I have thrown a new TypeError if the user calls userEvent.type or userEvent.paste with an element that has no value.
This PR is part of issue #356.

Why:

Because as it was before the PR the error was not very helpful

How:

By checking if the currentElement has value property.
The message thrown is like this the current element is of type BODY and doesn't have a valid value

Checklist:

• Documentation
• Tests
• Typings
• Ready to be merged
  

[codecov]

Codecov Report

Merging #375 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #375   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          385       392    +7     
  Branches       111       113    +2     
=========================================
+ Hits           385       392    +7     

Impacted Files	Coverage Δ
src/utils.js	100.00% <ø> (ø)
src/paste.js	100.00% <100.00%> (ø)
src/type.js	100.00% <100.00%> (ø)

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[kentcdodds]

I think we should also do this check in the currentValue function in type.

[marcosvega91]

I'm looking the code better and maybe there could be other problems like this

user-event/src/type.js

Lines 253 to 254 in 50e330b

	function calculateNewBackspaceValue(element) {
	const {selectionStart, selectionEnd, value} = element

user-event/src/type.js

Lines 286 to 287 in 50e330b

	function calculateNewDeleteValue(element) {
	const {selectionStart, selectionEnd, value} = element

Maybe we should use currentValue also in the other parts?

[kentcdodds]

Whatever you think makes the most sense 👍

[marcosvega91]

I have made the changes. I have updated also paste function with this logic

[kentcdodds]

Great. Thanks!

[kentcdodds]

@all-contributors please add @marcosvega91 for code and tests

[allcontributors]

@kentcdodds

I've put up a pull request to add @marcosvega91! 🎉

[kentcdodds]

Thanks so much for your help! I've added you as a collaborator on the project. Please make sure that you review the other/MAINTAINING.md and CONTRIBUTING.md files (specifically the bit about the commit messages and the git hooks) and familiarize yourself with the code of conduct (we're using the contributor covenant). You might also want to watch the repo to be notified when someone files an issue/PR. Please continue to make PRs as you feel the need (you can make your branches directly on the repo rather than your fork if you want). Thanks! And welcome to the team :)

[kentcdodds]

🎉 This PR is included in version 12.0.6 🎉

The release is available on:

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

Your semantic-release bot 📦🚀

[marcosvega91]

thank you @kentcdodds, it's awesome. I'm really happy to be part of another team of testing library 🥳 .
I like a lot the project and I hope to do always good thing 🦇

Thank you for all the things that you are doing for the community and the opportunity that you give to all of us ❤️