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More stuff on Isomorphic Rust
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tags: [rust, javascript]
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tags: [rust, javascript]
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---
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---
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I tried to come up with an opening sentence that talked about Javascript without being overly dismissive.
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Forgive me, but this is going to be a bit of a schizophrenic post. I both absolutely hate Javascript
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Instead, you get this.
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and the modern ECMAScript ecosystem, and I'm stunned by its success at doing some things I think
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are really cool. And it's this duality that led me to a couple of nights up at 2 AM over the past
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weeks trying to reconcile myself.
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And the standard "it's not you, it's me" language applies here. Node pushed out the benefits of an
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See, as much as [Webassembly isn't trying to replace Javascript](https://webassembly.org/docs/faq/#is-webassembly-trying-to-replace-javascript),
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asynchronous event loop everywhere, and languages like [Python](https://www.python.org/dev/peps/pep-0492/) and
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**I want to replace Javascript**. I cringe every time I hear the word "Webpack",
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[Rust](https://github.com/rust-lang/rfcs/pull/2394) are getting in on the game. Javascript, despite being
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and I think it's hilarious that the [language specification](https://ecma-international.org/publications/standards/Ecma-402.htm)
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a language that often makes you say "[wat](https://www.destroyallsoftware.com/talks/wat)", powers the
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dramatically outpaces anyone's ability [to actually implement](https://kangax.github.io/compat-table/es2016plus/)
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web.
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the specification. The answer to this conundrum is of course to have a "polyfill" that actually recompiles
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code from newer versions of the language to older versions of the language. At least
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[Babel][babel] is a nice tongue-in-cheek reference.
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---
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And yet, for as much hate as [Electron][electron] receives, it does a stunningly good job at solving
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a really hard problem: *how the hell do I put a button on the screen and react when the user clicks it*?
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GUI programming is hard, straight up. But if browsers are already able to run everywhere, why don't
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we take advantage of someone else solving the hard problems for us? Don't reinvent wheels. I hate
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that I have to use Javascript for it, but I apparently don't hate Javascript enough to want to
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whip out good ol' [wxWidgets][wxwidgets].
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But here's the thing: I don't like Javascript. I really don't. I don't like:
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Now, there are other "native" solutions ([libui-rs][libui-rs], [conrod][conrod], [oh hey wxWdidgets again!][wxRust]),
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but those also potentially have their own issues with distribution, styling, etc.
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With Electron, I can `yarn create electron-app my-app` and just get going, knowing that distribution/upgrades/etc.
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are built in.
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- having to manage incredibly complex Typescript/Babel/Webpack/Gulp toolchains
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So the question I want to answer is: **Are we Electron yet**?
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- having to know any of the above things exist
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- languages where the [runtime specification](http://www.ecma-international.org/ecma-262/9.0/index.html)
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dramatically outpaces [anyone's having actually implemented](https://kangax.github.io/compat-table/es2016plus/)
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the runtime specification
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---
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<span style="color:white;">No. No we are not.</span>
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But here's the thing: I don't like Javascript. I really don't. I cringe every time I hear the word "Webpack".
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# Technology Survey
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A part of me dies inside knowing that Babel exists to paper over the difference between what a committee
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has decided [the language should be](http://www.ecma-international.org/ecma-262/9.0/index.html) and
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[what actually exists](https://kangax.github.io/compat-table/es2016plus/). Not that anyone cares about my
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opinion.
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---
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The truth is, WASM/Webassembly is a pretty new technology, and there aren't a lot of nice tools. I knew going in
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that there were going to be some rough edges, but was curious to see what could be done. Before I get to that
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though, I need to explain a little bit of what the state of play is. **If you're already familiar with the WASM ecosystem,
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[skip ahead a bit](#building-an-electron-app).**
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So, when I hear that "Webassembly" is going to be a thing, I'm thrilled. Requisite jokes about
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First things first, we're going to skip [asm.js][asm.js] and [emscripten][emscripten]. Truth be told, I couldn't
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[Metal](https://www.destroyallsoftware.com/talks/the-birth-and-death-of-javascript) aside
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get either of these to produce a usable binary, and so I'm just going to say [here be dragons.][https://en.wikipedia.org/wiki/Here_be_dragons]
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([oh wait, they're not joking](https://www.reddit.com/r/rust/comments/8j7y1f/i_am_lachlansneff_creator_of_nebulet_a_rust/)),
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this seems like a fundamentally good way to skip the Babel/Webpack mess and get straight to
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allowing other languages to earn a share of the market that Javascript occupies.
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And I get that [WebAssembly isn't trying to replace JavaScript](https://webassembly.org/docs/faq/#is-webassembly-trying-to-replace-javascript).
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So how does one go about producing a "Webassembly"? That's done by compiling to a separate *target*.
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But I want Javascript gone.
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First, make sure the target is installed:
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```
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rustup install nightly # Just trust me on this one
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rustup target add wasm32-unknown-unknown
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```
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And then we can build the project with:
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```
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cargo +nightly build --target=wasm32-unknown-unknown
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```
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Now, this produces a Webassembly/WASM file (in `target/wasm32-unknown-unknown/debug/`) that we can load in the
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browser. However, the resulting blob isn't really easy to use; you'd have to write a lot of extra code
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for Javascript to figure out what functions are actually usable. Fortunately, [wasm-bindgen][wasm-bindgen]
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handles a lot of that for you (and is part of why we need nightly). The end result is that we can
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easily allow Javascript to access Rust code.
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This only gets you one-direction communication though. If you want to interact with Javascript,
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[js-sys][js-sys] acts as a "header" library; it tells the Rust compiler "no trust me, these functions
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will totally exist at runtime" and allows the compiler to generate your code.
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If you want to interact with the Browser the answer is a bit complicated at the moment.
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There are currently [three][stdweb] [different][percy-webapis] [libraries][web-sys]
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that seek to do that, and only one of them has made it past version `0.0.1` ([stdweb][stdweb], it's stdweb).
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That said, I expect [web-sys][web-sys] to be the long-term solution, so keep an eye on that one.
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But we don't want to just interact with the browser, we want to build an entire application.
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And since We Totally Need An Application Framework™, there are a couple of options available:
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[virtual-dom-rs][virtual-dom-rs] (a.k.a. [percy][percy]), and [yew][yew]. From what I gather,
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`virtual-dom-rs` is attempting to be [React][react], and `yew` is attempting to be [elm][elm].
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Testing your applications is a bit tricky at the moment, and to be honest, I didn't manage to get that far.
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If you're brave though, [cargo-web][cargo-web] has some nice handling to actually run your tests
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inside a browser (we're using WASM, remember?). As a practical example, [percy][percy-test] has
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a unit test or two to demonstrate, but it's pretty basic so far.
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And while we won't cover it here, if you want to ship Webassembly code to NPM, you can do that
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via [wasm-pack][wasm-pack]. It attempts to handle some of the difficult bits so that people who want
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to use Javascript (not me) can get access to your code really easily.
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So, that's a quick tour of the state of play. Things are in the early stages, so it's a bit difficult
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to figure out who's doing what and why they exist, but this hopefully at least sets the stage.
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# Building an Electron App
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Now that you've managed to piece your way through a fragmented ecosystem ([not][gulpjs] [unlike][typescript]
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[current][vuejs] [ECMAScript](https://benmccormick.org/2015/09/14/es5-es6-es2016-es-next-whats-going-on-with-javascript-versioning/)),
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it's time to actually build an application. The code I'll be referring to is
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[over here](https://github.com/bspeice/isomorphic_rust).
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[wxwidgets]: https://wxwidgets.org/
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[libui-rs]: https://github.com/LeoTindall/libui-rs/
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[electron]: https://electronjs.org/
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[babel]: https://github.com/babel/babel
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[conrod]: https://github.com/PistonDevelopers/conrod
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[wxRust]: https://github.com/kenz-gelsoft/wxRust
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[wasm-bindgen]: https://github.com/rustwasm/wasm-bindgen
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[js-sys]: https://crates.io/crates/js-sys
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[percy-webapis]: https://crates.io/crates/percy-webapis
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[stdweb]: https://crates.io/crates/stdweb
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[web-sys]: https://crates.io/crates/web-sys
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[percy]: https://chinedufn.github.io/percy/
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[virtual-dom-rs]: https://crates.io/crates/virtual-dom-rs
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[yew]: https://github.com/DenisKolodin/yew
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[react]: https://reactjs.org/
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[elm]: http://elm-lang.org/
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[wasm-pack]: https://github.com/rustwasm/wasm-pack
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[cargo-web]: https://github.com/koute/cargo-web
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[percy-test]: https://github.com/chinedufn/percy/tree/master/examples/unit-testing-components
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[asm.js]: http://asmjs.org/
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[emscripten]: https://kripken.github.io/emscripten-site/
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[gulpjs]: https://gulpjs.com/
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[typescript]: https://www.typescriptlang.org/
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[vuejs]: https://vuejs.org/
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