Clojurians Log v2

Hello! I'm looking for an example repository with: 1. Some react components written in Typescript 2. State logic in Clojurescript 3. Some Rust compiled to WASM that's usable from Clojurescript and Typescript, using https://rustwasm.github.io/docs/wasm-bindgen/ 4. An overall reasonable workflow. I'm asking here because I lack Clojurescript experience. I'm looking for a live experience. Change the Rust code, be able to play with it from a Clojurescript REPL. Does anyone know of an example like this? Any other pointers, especially in consuming WASM from Rust in Clojurescript?

I setup an example with wasm a while ago. the experience is far from smooth though. getting things hooked up to play with it from the REPL is going to be problematic https://github.com/thheller/wasm-pack-cljs

likely everything has changed since then too so no clue how it looks today

Put all of those things together except for the Clojurescript, since you are new to Clojurescript. Then, try out your Rust->WASM stuff from javascript until you feel it is working. Then, referencing the "javascript interop" section of https://cljs.info/cheatsheet/ start calling it from Clojurescript.

Thank you! Your README writeup was exactly what I was looking for 😊

https://github.com/rustwasm/wasm-bindgen/tree/master/examples/without-a-bundler looks basically untouched since you did the writeup, except for wasm-bindgen version bumps.

This passage sums it up for me: > Status Report May 2020 > > [...] This time I tried wasm-pack from Rust and the result is almost close to usable. I have yet to try more complex examples but the really simple one worked. I think I'll eagerly await tooling that's a bit more mature.

> I'll probably revisit this in a couple of months to see where things are then. 👀 🤞

I have an issue that I’m trying to think through, and thought maybe people could give me some ideas please? I have code that works in both Clojure and ClojureScript. Most of the time it’s handling everything it needs in memory, but every so often, down at the bottom of the call stack, it needs to get data from the outside. It can’t proceed until it has these results, so it needs to wait. That’s OK, because it does not need to be in a main thread. It happens in a Clojure Future, or in ClojureScript it happens in a Webworker.

I want to make the data it needs to get able to come from IndexedDB. However, I can’t think of any way to wait on that data without rearchitecting the entire codebase around that need.

IndexedDB used to have a synchronous API which was available for webworkers, and this would have been perfect. But it was excised 😕

Anyway, if anyone knows of an approach, then I would love to hear about it please. I’m really not an expert in this environment, and so I’m fumbling a bit

Is there any difference in setting up a Clojurescript project than with Clojure? Preferably using Leiningen

You simply cannot wait for an async function to return. You have to rewrite the code to work with promises or non-blocking async ops on channels (blocking ops exist only in Clojure but not in ClojureScript for the same reason).

Depends on what you mean by "setting up a project". With lein, at the very least you'll probably need a plugin that compiles CLJS into JS (assuming you're not going to run self-hosted CLJS).

So when I came here saying that I can’t think of any way to do this, because I don’t think there is a way to wait for anything in ClojureScript, you’re saying that I’m correct in my understanding. Right?

Exactly.