Describe the bug

error during build:
[vite]: Rollup failed to resolve import "@polymer/polymer/lib/legacy/polymer-fn.js" from "J:/fc/addons/SimpleTimerAddon/frontend/generated/jar-resources/simple-timer/simple-timer.js".
This is most likely unintended because it can break your application at runtime

Expected behavior

No response

Minimal reproducible example

No response

Add-on Version

3.0.0-SNAPSHOT

Vaadin Version

25.0.0.beta2

Additional information

No response