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Right now. WASM has been supported by every browser for a while now, and most webapps are made with WASM. That said, it's not a replacement for Javascript, most people only use it on things that need to be high performance like heavier apps and web games. Nobody really makes websites that rely on WebAssembly instead of JS to my knowledge.
From my understanding, it’s because WASM is pure (deterministic) and needs stateful entry points in order to work. For this reason, a JavaScript bit to interact with it is a requirement at the moment.
Also WASM can't directly manipulate the DOM so it can't really be used for handling HTML/CSS, all front-end stuff still has to be done with JS.
While it’s true you can’t do it in WASM directly, there are frameworks that interoperate between WASM and JS, such as Yew
One only needs to create an interface between them, since WASM is capable of calling JS functions. DOM manipulation then becomes as simple as calling a function in your language of choice, such as with web-sys
JavaScript is slow if you need to do things that JavaScript can’t do, such as
JS is slow, but I program Rust and Scala. Every internal app at my company is react based and I spend most my time waiting for that bloated framework to load a simple table. It can take seconds to load a 20 route paginated table from source.
react is slow
Since JS is single threaded it can be pretty slow compared to anything being able to use multiple threads
We've got a WebAssembly web-UI at $DAYJOB. Implementation language is Rust, we use the Leptos framework (although other mature frameworks are available for Rust).
Pros:
ResultandOptiontypes + pattern-matching works really well for UI stuff. You just hand theResultvalue over to your rendering stack and that displays either the value or the error. No unset/null variables, no separate error variable, no ternaries.Cons:
With me being in a team with few frontend folks, I would definitely opt for it again.