[umvi]

I tried using it with Angular, but it doesn't seem to help much. For example, if you have something like:

    <button (click)="login(email, pass)" />

And then a TypeScript function like:

    login(email: string, pass: string) {
    
    }

TypeScript can't help you at all here because all the typing is determined at runtime by Angular. Even if `email` is a number or a boolean, no problem, it will just happily pass it in.

What benefit, then, does TypeScript provide? I understand it's compile-time guarantees, but how does that help if the types are coming in from HTML land which the TypeScript compiler doesn't examine at all?

[threecreepio]

For your template code in angular, there won't be any significant benefit to using typescript. It could be worse than not having typescript at all, since you can add type annotations to your 'login'-function that don't match up with reality.

That's not really a typescript issue though, and it works great with libraries that don't use string templates. From what I've seen the angular community hasn't really prioritized a typecheck-able templating language.

[dmix]

Nor does Vue. The focus is on typing the reactive data that feeds the templates which should be sufficient.

Plenty of things like HTML form elements take numbers or strings just fine, as it all outputs to strings in the end. Additionally, by breaking up stuff into smaller composable components there should be enough gating and typing layers, at least with Vue/Vuex that's the case. If it was just plopping straight into the elements 1-to-1 that might be a different story.

[olmo]

Glad to see someone pints this out. That’s the main reason I use React + Typescrip. JSX is an extension of javascript and can be fully checked while any template language is a custom invention that it’s hardly toolable.

[evmar]

Angular has been working on type-checking the templates: https://blog.angularindepth.com/type-checking-templates-in-a...

Disclaimer: I have heard about the above enough to dig up a random blog post about it but I don't know a lot about how it works.

I think in JSX (and I've seen experiments with lit too) there is also integration between the template and type checker.