Porting Elm to WebAssembly

• elm-spa-example

  12 3,277 0.0 Elm

  A Single Page Application written in Elm

After all that I've managed to reach my goal of being able to run Richard Feldman's Elm SPA Example in my system! 😃 Here's a working implementation compiled to WebAssembly. And for comparison, you can also check out the same code compiled to JavaScript. (Unfortunately the publicly available APIs don't seem to be returning very much data at the moment but there's not much I can do about that!)

• core

  9 2,783 0.0 Elm

  Elm's core libraries (by elm)

  

Once all that handwritten C code was solid, I needed to make sure the C generated from Elm was working properly. I found the source for the core library's unit tests and decided to port them into my project and add some of my own tests. You can run the tests in WebAssembly in your browser too. (Funnily enough, one of the biggest challenges was getting the Elm Test framework itself to run! The framework is more complex than the tests themselves. I still need to come back to the fuzzer tests!)

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• test

  3 231 5.4 Elm

  Write unit and fuzz tests for Elm code. (by elm-explorations)

  

Once all that handwritten C code was solid, I needed to make sure the C generated from Elm was working properly. I found the source for the core library's unit tests and decided to port them into my project and add some of my own tests. You can run the tests in WebAssembly in your browser too. (Funnily enough, one of the biggest challenges was getting the Elm Test framework itself to run! The framework is more complex than the tests themselves. I still need to come back to the fuzzer tests!)

• gc

  43 924 9.4 WebAssembly

  Branch of the spec repo scoped to discussion of GC integration in WebAssembly

  

This is obviously a major drawback and the WebAssembly project has several proposals to work towards better host integration. One of the key issues is how to manage reference lifetimes - if a Wasm module is holding a reference to a DOM node, then it can't be garbage-collected. And if it is just a number in Wasm then it can be copied, which makes it hard to keep track of the copies. These issues are addressed in the GC proposal, which has been at "stage 1" since I first looked at it in 2018.

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