parse exception: duplicate export name

[Madoshakalaka]

Some of Yew's example crates (but not all) fail to build in our binary size comparison CI because of wasm-opt

https://github.com/yewstack/yew/actions/runs/19726188911/job/56517994922?pr=3949#step:9:676

  [parse exception: duplicate export name (at 0:8529)]
  Fatal: error parsing wasm (try --debug for more info)
  2025-11-27T05:32:21.251418Z ERROR ❌ error
  error from build pipeline
  
  Caused by:
      0: HTML build pipeline failed (1 errors), showing first
      1: error from asset pipeline
      2: running wasm-opt
      3: wasm-opt call to executable '/home/runner/.cache/trunk/wasm-opt-version_125/bin/wasm-opt' with args: '["--output=/home/runner/work/yew/yew/target/wasm-opt/release/function_router_bg.wasm", "-O", "/home/runner/work/yew/yew/dist/function_router/.stage/function_router-93f56f6c1d2b72c_bg.wasm"]' returned a bad status: exit status: 1
  2025-11-27T05:32:21.251443Z ERROR error from build pipeline
  2025-11-27T05:32:21.251452Z  INFO   1: HTML build pipeline failed (1 errors), showing first
  2025-11-27T05:32:21.251454Z  INFO   2: error from asset pipeline
  2025-11-27T05:32:21.251455Z  INFO   3: running wasm-opt
  2025-11-27T05:32:21.251456Z  INFO   4: wasm-opt call to executable '/home/runner/.cache/trunk/wasm-opt-version_125/bin/wasm-opt' with args: '["--output=/home/runner/work/yew/yew/target/wasm-opt/release/function_router_bg.wasm", "-O", "/home/runner/work/yew/yew/dist/function_router/.stage/function_router-93f56f6c1d2b72c_bg.wasm"]' returned a bad status: exit status: 1

[kripken]

Please provide a wasm file to reproduce this issue.

[tlively]

Is it possible that wasm-opt is correct and there actually are duplicate export names? If so, this would be working as intended because duplicate export names are disallowed by the Wasm spec.