ES6-compliant export for vite support

[xela92]

Hi,

I made this change proposal to be able to support Vite, export = cardValidator is not valid when targeting ES6. This PR fixes it, and as card-validator depends on other old libraries I also needed to do some other changes in order to make it work (I refer to my way of exporting creditCardType).

The downside of this PR is that you can't do default imports anymore (like the one you ship with your documentation, import valid from 'card-validator') but you need to import the single utils. This could be made better, maybe targetting ESNext and starting a fixing chain to the dependent libraries as well.

Also, to avoid naming ambiguity between number function and the primitive, i suggest to remove the number export and use the one I added, cardNumber, instead, but I didn't make it as it's another super-breaking change.

Actually, I published another package that ships with this changes (card-validator-es6), of course if you decide to merge this I will unpublish that to avoid confusion.

If you have better solutions in mind, please share them :-)

Best regards,

Alex

[hollabaq86]

:wave @xela92 Thanks for the PR! Removing existing functionality is a breaking change which is why I marked this PR a breaking change. That said, We should update the library to have ES6 Support.

We'll take a look and provide feedback.

For internal tracking, issue 2522