Use TypeScript

[jrandolf]

This PR rewrites Parsel with TypeScript. This allows for precise typing and better compatibility with future TypeScript without the manual typing.

[LeaVerou]

Hey, thank you so much for working on Parsel!

Please break this down into multiple PRs so it can be reviewed and merged separately. I know this is a hassle, but as it currently stands, it's very difficult to review, and there is no way to only accept some of the changes and not others.

This is standard in every open source project, huge PRs with multiple unrelated changes are considered an antipattern. It is also typically a good idea to consult maintainers before making radical changes to the codebase.

[bramus]

+1 to what @LeaVerou said. I can see several parts which I also considered (such as moving the tests to an automated test suite, excluding the built files, etc) but to merge/accept them they’d need to have their own PR.

[netlify]

✅ Deploy Preview for parsel ready!

Name	Link
🔨 Latest commit	c7e9b8c
🔍 Latest deploy log	https://app.netlify.com/sites/parsel/deploys/6407f9b537809b0008286fbf
😎 Deploy Preview	https://deploy-preview-49--parsel.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[jrandolf]

Sorry, actually I'll reopen #53. I need the master branch.