Support transpile for fixed size lists

[yannbolliger]

Transpiling a WIT component that has fixed size lists e.g. list<u8, 32> in its interface currently fails with:

npx jco transpile some.wasm -o src/generated --no-namespaced-exports

(jco transpile) ComponentError: failed to translate component

Caused by:
    Fixed size lists require the component model fixed size list feature (at offset 0x77c8d)
    at generate (file:///.../node_modules/@bytecodealliance/jco/obj/js-component-bindgen-component.js:8092:11)
    at transpileComponent (file:///.../node_modules/@bytecodealliance/jco/src/cmd/transpile.js:202:39)
    at async transpile (file:///.../node_modules/@bytecodealliance/jco/src/cmd/transpile.js:73:23)
    at async file:///.../node_modules/@bytecodealliance/jco/src/jco.js:485:1

component generated with: wit-bindgen = "0.52"
version: "@bytecodealliance/jco": "^1.16.0",

[vados-cosmonic]

Hey @yannbolliger, thanks for the report.

While we've updated upstream deps and enums across the codebase to deal with fixed size lists, the implementation is not there just yet.

Pull requests are certainly welcome of course, but right now the focus is on P3 so I'm afraid fixed size lists may not land for a bit.

[yannbolliger]

Hey @vados-cosmonic, would you be open to PRs if I tried to implement this? And is it possible to implement or are there any dependencies that still lack this feature as well?

[vados-cosmonic]

Absolutely happy to accept a PR if you want to work on this -- hopefully the code is reasonable to navigate and you can lean on some of the other implementations!

Please feel free to let me know if you have any questions, we can discuss in the PR etc too.

I think that there aren't any real blocking factors here other than:

1. Updating configuration for upstream libraries to enable fixed lists
2. Building a component that uses the fixed list (that likely should be added to the repo in the rust test component code)
3. Adding impl to js-component-bindgen
4. Adding tests to jco for the new in-repo component