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  • I like TypeScript for its types and type-checking, but I also want to write JavaScript to avoid having a local build step, and having to wait for things to transpile/compile/etc when running locally. I have a pretty large project where I've gotten both worlds by just using JSDoc and only using TS for type-checking. VSCode still offers built-in type-checking with JSDocs and ofc the type-checking can also be run separately if needed.

  • I've been writing my own render framework and component library for about a year now.

    One thing I enjoy most about it is that the types are automatically inferred. There's a lot of Typescript wrangling going on, and it gets really deep into what TS is capable of and barely capable of (polymorphic this, dynamic return types based on input, Class type reconstruction, mixins that influence both static and instance properties, event listeners based on event name, typed property watchers based on property name).

    It's all written in JavaScript with "JSDocs". It's not really JSDocs because there's a lot of recursion that's not possible with regular JSDocs. It's TS type information slipped into JSDoc comments.

    Ridiculously complex core Class

    But that is to setup the ability to tap into inferred types. The actual code that's written (eg: components) is fully typed check with little or no type declaration.

    Declarative-style component with almost no explicit typing

    The reality is, no complex piece of code should be written without some form of type checking. TS isn't perfect and if there were something better, I'd move. Alliances are stupid. There are problems with some things that have not been, and likely will never be, fixed. But what type-checkers should do best is infer types dynamically.

    The result means all my code today just runs in the browser. I don't have to wrangle builders or compilers (bye Webpack!). At most, I use just esbuild to minify, though it's an optional step, not a mandatory one. If I want to mess around on Codepen with my library, I can refer to a git commit directly and load the file. I don't need npm to package and release. (CodePen Sample)

  • I haven't managed to break into the JS-adjacent ecosystem, but tooling around Typescript is definitely a major part of the problem:

    • following a basic tutorial somehow ended up spending multiple seconds just to transpile and run "Hello, World!".
    • there are at least 3 different ways of specifying the files and settings you want to use, and some of them will cause others to be ignored entirely, even though it looks like they should be used.
    • embracing duck typing means many common type errors simply cannot be caught. Also that means dynamic type checks are impossible, even though JS itself supports them (admittedly with oddities, e.g. with string vs String).
    • there are at least 3 incompatible ways to define and use a "module", and it's not clear what's actually useful or intended to be used, or what the outputs are supposed to be for different environments.

    At this point I'm seriously considering writing my own sanelanguage-to-JS transpiler or using some other one (maybe Haxe? but I'm not sure its object model allows full performance tweaking), because I've written literally dozens of other languages without this kind of pain.

    WASM has its own problems (we shouldn't be quick to call asm.js obsolete ... also, C's object model is not what people think it is) but that's another story.


    At this point, I'd be happy with some basic code reuse. Have a "generalized fibonacci" module taking 3 inputs, and call it 3 ways: from a web browser on the client side, as a web browser request to server (which is running nodejs), or as a nodejs command-line program. Transpiling one of the callers should not force the others to be transpiled, but if multiple of the callers need to be transpiled at once, it should not typecheck the library internals multiple times. I should also be able to choose whether to produce a "dynamic" library (which can be recompiled later without recompiling the dependencies) or a "static" one (only output a single merged file), and whether to minify.

    I'm not sure the TS ecosystem is competent enough to deal with this.

  • I’m idealistically/philosophically committed to a Purescript Halogen front end with a Haskell Servant backend, biatch. Maybe someday I’ll get WASM in there. One thing I will not do is use TS or JS.

  • well, I mostly create SPAs, with big projects a type system is a necessity...

226 comments