Complex Build (Rust + JS)

Support
1

Site name: astonishing-muffin-30b635.netlify.app

I am attempting to build an app that requires building first a rust WASM portion using wasm-pack, and then a vue webapp.

What is the normal process to do something like this? In a normal CLI it woud look something like:

cargo install wasm-pack
yarn wasm
yarn build

Logs:

7:41:51 PM: $ rustup default stable & cargo install wasm-pack & yarn wasm & yarn build
7:41:51 PM: info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'
7:41:51 PM: error: rustup could not choose a version of cargo to run, because one wasn't specified explicitly, and no default is configured.
help: run 'rustup default stable' to download the latest stable release of Rust and set it as your default toolchain.
7:41:51 PM: info: latest update on 2025-12-11, rust version 1.92.0 (ded5c06cf 2025-12-08)
7:41:51 PM: info: downloading component 'cargo'
7:41:51 PM: yarn run v1.22.22
7:41:51 PM: warning package.json: No license field
7:41:51 PM: $ vite build
7:41:51 PM: yarn run v1.22.22
7:41:51 PM: warning package.json: No license field
7:41:51 PM: $ wasm-pack build ./key_bnc_wasm --target web
7:41:51 PM: /bin/sh: 1: wasm-pack: not found
7:41:51 PM: error Command failed with exit code 127. (https://ntl.fyi/exit-code-127)
7:41:51 PM: info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
7:41:51 PM: info: downloading component 'clippy'
7:41:51 PM: info: downloading component 'rust-docs'
7:41:51 PM: info: downloading component 'rust-std'
7:41:51 PM: info: downloading component 'rustc'
7:41:52 PM: vite v2.6.10 building for production...
7:41:52 PM: Error: Can't find key_bnc_wasm/pkg, run wasm-pack build ./key_bnc_wasm --target web first
âś“ 0 modules transformed.
2

Have you tried:

rustup default stable && cargo install wasm-pack && wasm-pack build ./key_bnc_wasm --target web

Seems to be working for me.

3

Thank you! rustup default stable was the missing link

4

Another option is to use the rust-toolchain file. It should tell cargo to use the toolchain channel you specify. In the case of OP it would be stable.

5

You know what’s weird? I ended needing to use rustup toolchain install 1.78.0 and it was working fine.

But I just pushed a branch with some simple CSS changes, and now it has stopped working. It’s giving me the following error:

10:23:27 AM: $ rustup toolchain install 1.78.0 && cargo install wasm-pack --version=0.10.1 --locked && pnpm wasm && pnpm build
10:23:28 AM: Failed during stage 'building site': Build script returned non-zero exit code: 2 (https://ntl.fyi/exit-code-2)
10:23:28 AM: info: syncing channel updates for '1.78.0-x86_64-unknown-linux-gnu'
10:23:28 AM:   1.78.0-x86_64-unknown-linux-gnu unchanged - rustc 1.78.0 (9b00956e5 2024-04-29)
10:23:28 AM: error: rustup could not choose a version of cargo to run, because one wasn't specified explicitly, and no default is configured.
help: run 'rustup default stable' to download the latest stable release of Rust and set it as your default toolchain.
6

After putting a rust-toolchain.toml in the root, and removing the explicit rustup command, the latest run seems to have built fine. I still don’t know what’s up with the flakiness, though.

7

Glad it worked. Awesome.

It’s not flakiness. It’s the fact that assets for your builds are cached and there is some side effect causing it to fail.