[BUG] JS Snippets not working anymore.

[MathieuTricoire]

Is there an existing issue for this?

• I have searched the existing issues

What version of workers-rs are you using?

0.0.18

What version of wrangler are you using?

3.15.0

Describe the bug

Hi everyone,

I've recently started working with Cloudflare and Cloudflare Workers, and I've encountered what appears to be a regression with "JS Snippets". Upon reviewing the repository's history, it seems that this feature was previously functioning correctly, but I suspect changes, potentially around the "glue" code, might have affected this functionality.

Error when running npm run dev

WebAssembly code:

Shim.mjs code (glue code):

Let me know if I miss something or if this is a real issue.

Thanks,
Mat

Steps To Reproduce

Use my example: https://github.com/MathieuTricoire/workers-rs/tree/fix-js-snippets/examples/js_snippets

If you clone my repo and want to be sure to reproduce the error do not forget to replace the wrangler.toml build command with something like this, since my repo contains a fix:

[build]
command = "worker-build --release"

[MathieuTricoire]

FYI: I have a potential fix on my fork, let me know if you want me to create a PR.

[kflansburg]

I'm not familiar with this mechanism, is this part of wasm-bindgen that we need to support in our custom glue code? I know that we treat WebAssembly imports different than other runtimes which may be the issue here. Are you using Miniflare 2 or 3?

[MathieuTricoire]

Yes it's in wasm-bindgen: https://rustwasm.github.io/wasm-bindgen/reference/js-snippets.html and it was previously supported see this PR #142.

I'm using Miniflare 3.