[Bug]: prod build marks worker export as not used

[felixmosh]

Version

System:
    OS: macOS 15.3.1
    CPU: (12) arm64 Apple M3 Pro
    Memory: 318.75 MB / 36.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Chrome: 133.0.6943.127
    Safari: 18.3
  npmPackages:
    @rsbuild/core: ^1.2.8 => 1.2.11

Details

for some reason prod build marks the exported function as not used.

Reproduce link

https://github.com/felixmosh/rsbuild-worker-prod-bug

Reproduce Steps

1. yarn install
2. yarn dev - (check that all works, the worker prints worker content)
3. yarn build
4. node ./dist/server.js - fails since the exported variable is marked as unused (based on the comments)

[9aoy]

Rspack enables optimization.usedExports in production mode by default, and did not detect that this export was used, so it was tree-shaked.

Rspack cannot statically analyze this syntax:

+ const worker = await eval('import(workerPath)');

  if(worker.default && typeof worker.default.default === 'function') {
    await worker.default.default();
  }

[felixmosh]

Hi @9aoy thank you for the reply...

I've change the eval to __non_webpack_require__, still the same output :| (you can check the change in the repo)