TypeScript: support sweetalert2 modules in dist and src folders

[limonte]

Fixing the issue I described in https://stackoverflow.com/questions/57321486

TLDR: right now import Swal from 'sweetalert2/dist/sweetalert2.js' isn't TS-friendly and producing this error:

Could not find a declaration file for module 'sweetalert2/dist/sweetalert2.js'. 

ts(7016)

This PR is based on @toverux's answer https://stackoverflow.com/a/57323500

[coveralls]

Pull Request Test Coverage Report for Build 5245

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.825%

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Totals
Change from base Build 5237:	0.0%
Covered Lines:	1303
Relevant Lines:	1379

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💛 - Coveralls

[toverux]

Hah, it's a nice idea to use globs in the .d.ts file to cover both src and dist!
It is also possible to type every .js module in src/ and derive the type of the dist/ files from that, that would be the cleanest and definitive method to do it, however I don't think our customers often use internal symbols and submodules (even src/SweetAlert.js), and therefore this approach may be way too invasive for this particular project.

[limonte]

Hah, it's a nice idea to use globs in the .d.ts file to cover both src and dist!

Yup, wildcards are working nicely, I also tried

declare module 'sweetalert2/*/sweetalert2.*js' {

to avoid copy-pasting, but

Pattern 'sweetalert2/*/sweetalert2.*js' can have at most one '*' character.

ts(5061)

Thanks again @toverux for your valuable (as always) input!

[limonte]

🎉 This PR is included in version 8.14.1 🎉

The release is available on:

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

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