Dependency optimization breaks `new URL(foo, import.meta.url)`

[wietsedv]

Describe the bug

Packages that use WASM often contain lines like new URL('localfile.wasm', import.meta.url);. The vite optimizer puts a version of de javascript code in the node_modules/.vite/deps cache, but does not copy the wasm file or rewrite the path.

This is a common issue with vite (vitejs#8427), but in that issue it is suggested that this would be fixed in rolldown-vite since it has a reimplemented optimizer. The rolldown-vite optimizer seems broken in the exact same way.

Production builds work fine since the wasm file will be copied from the original directory to the output directory. Development builds that use optimized code from node_modules/.vite/deps are broken.

The error that appears is the error below. In practice, the error is that the optimized javascript attemps to load http://localhost:5173/node_modules/.vite/deps/color_thief_wasm_bg.wasm which does not exist.

Uncaught (in promise) CompileError: wasm validation error: at offset 4: failed to match magic number color-thief-wasm-web_color_thief_wasm__js.js:111:1

Reproduction

https://stackblitz.com/edit/vitejs-rolldown-vite-mcvqmvx6?file=package.json,src%2Fmain.js

Steps to reproduce

No response

System Info

System:
    OS: macOS 15.5
    CPU: (8) arm64 Apple M1
    Memory: 143.83 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.17.0 - /run/current-system/sw/bin/node
    npm: 10.9.2 - /run/current-system/sw/bin/npm
    bun: 1.2.19 - /run/current-system/sw/bin/bun
    Watchman: 2025.04.21.00 - /run/current-system/sw/bin/watchman
  Browsers:
    Safari: 18.5
  npmPackages:
    rolldown-vite:  7.1.0

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs and the Rolldown-related guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[sapphi-red]

This is currently expected as the optimizer works in a similar way. But Rolldown has a much more flexible plugin API, which would make it easier to implement the fix. The fix would be to add a plugin that rewrites new URL('./foo', import.meta.url) into new URL('./foo/relative/from/node_modules/.vite', import.meta.url).

While I don't have the bandwidth right now, a PR would be welcome.