node-app-store-connect-api VS TypeScript

Here's a perfect example. I maintain a simple Node library designed to connect to Apple's App Store Connect API. https://github.com/dfabulich/node-app-store-connect-api

It accepts, as a parameter, an URL for Apple's REST API. My library handles authentication, and returns the parsed JSON result, with a handful of tweaks to make the API more usable in JavaScript.

Depending on which URL you request, you'll get different result object back. You could get a single object in response, or an array of objects, and the type of returned objects is different for each URL type.

How would you add TypeScript types to this API? Well, Apple provides an OpenAPI documentation of all of their URLs, which I could use to autogenerate types, but then, how would I handle all of those types in response to the user's string input?

Well, it turns out that TypeScript is so amazingly fancy that you can write very clever code to parse strings at compile time, extracting parameter types etc. from string literal types. https://lihautan.com/extract-parameters-type-from-string-lit...

The documentation explains how an API like this:

   app.get('/purchase/[shopid]/[itemid]/args/[...args]')

While we were fighting against the modules, we forgot one small detail - their built-in typings. Esbuild can't do this at all yet. Unbelievable, but the tsc, native TS compiler, also does not provide a typings concat feature. Got around this problem: we've introduced [a utility to combine typings](tsc-dts-fix of zx own code, and applied some monkey patches for external libdefs squashed via dts-bundle-generator.

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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