ellie VS TypeScript

Sorry I'm not being helpful (in that, I dont have a solution for you) but it would be great if you could put this up as a working demo on Ellie (https://ellie-app.com/).

There is an online editor, named Ellie, to play with the language without the need to install anything on your machine. Ellie permits to install dependencies for your code, so you can prototype an entire project with it.

After that point I started looking into how Elm works from the web dev perspective with resources like Elm in Action and Frontend Masters courses (first working in ellie-app-for-elm-dev then upgrading to vite-elm-template).

I can still give you some pointers here. First I'd suggest you read the elm guide: https://guide.elm-lang.org/ It's the best place to start with elm. When you have a question about any specific subject, you should head to the slack, or ask a question on the elm discourse: https://discourse.elm-lang.org/ . The best way to get a useful answer, is to have a concrete question, and to prepare an example of what is wrong on Ellie (https://ellie-app.com). As such people can modify your Ellie to answer you.

You can paste it to Ellie for testing

req: Request { bodyUsed: false, headers: Headers { accept: "*/*", "accept-encoding": "gzip, deflate, br", "accept-language": "en-US,en;q=0.9,la;q=0.8", connection: "keep-alive", host: "localhost:8000", origin: "https://ellie-app.com", "sec-ch-ua": '"Chromium";v="94", "Google Chrome";v="94", ";Not A Brand";v="99"', "sec-ch-ua-mobile": "?0", "sec-ch-ua-platform": '"macOS"', "sec-fetch-dest": "empty", "sec-fetch-mode": "cors", "sec-fetch-site": "cross-site", "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4..." }, method: "GET", redirect: "follow", url: "http://localhost:8000/" } ourAnswer: Response { body: ReadableStream { locked: false }, bodyUsed: false, headers: Headers { "content-type": "text/plain;charset=UTF-8" }, ok: true, redirected: false, status: 200, statusText: "", url: "" }

https://builtwithelm.co/ lists some, but not sure what you consider large.

Not sure if you would categorize this as dev tool https://github.com/erkal/kite

And ellie certainly might be a dev-tool, but not a toy https://github.com/ellie-app/ellie

Regular expressions are part of the language, so it's not so unreasonable that TypeScript should parse them and take their semantics into account. Indeed, TypeScript 5.5 will include [new support for syntax checking of regular expressions](https://github.com/microsoft/TypeScript/pull/55600), and presumably they'll eventually be able to solve the problem the GP highlighted on top of those foundations.

Dedicated syntax for creating unique subsets of a type that denote a particular refinement is a longstanding ask[2] - and very useful, we've experimented with implementations.[3]

I don't think it has any relation to runtime type checking at all. It's refinement types, [4] or newtypes[5] depending on the details and how you shape it.

[1] https://github.com/microsoft/TypeScript/blob/main/src/compil...

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