Changes of loaded files will not trigger a rebuild in rolldown watch mode

[CyanSalt]

Describe the bug

In a tsdown project, editing files will trigger a rebuild properly when using tsdown --watch. However, editing files imported via ?raw does not trigger a rebuild.

This is likely because the watcher is not notified via this.addWatchFile.

Reproduction

https://stackblitz.com/edit/stackblitz-starters-jrquvz9z?file=src%2Findex.ts

System Info

System:
    OS: macOS 26.5
    CPU: (12) arm64 Apple M3 Pro
    Memory: 297.59 MB / 36.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 24.15.0
    pnpm: 11.0.9
  Browsers:
    Chrome: 149.0.7827.156
    Safari: 26.5

Used Package Manager

pnpm

Validations

• Follow our Code of Conduct
• Read the Contributing 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, please open a GitHub Discussion instead.
• The provided reproduction is a minimal reproducible of the bug.

[bolt-new-by-stackblitz]

Start a new pull request in StackBlitz Codeflow.

• stackblitz-starters-jrquvz9z (Open reproduction)