feat(files-changed): externalFileStatus overrides for in-project + cross-project deletions (#844)

[jeonghun-jj-lee]

What

When the filesystem watcher detects an external deletion, the status override now applies to all watched files — not just cross-project ones. Previously, in-project files relied solely on the server refetch, which didn't always clear the entry (the snapshot-based diff still returned the file as added). This caused deleted files to persist in Files Changed and to be resurrectable via save.

Changes

• accumulate-diffs.ts — Add externalFileStatus to MergeOpts. Apply the override to normalizedServerDiffs (not just cross-project tool diffs), so in-project files returned by the server get their status overridden when the watcher says they are deleted.
• session.tsx — Add externalFileStatus signal, onFsDiffInvalidate handler (no projectPrefix guard), watch-files sender effect, and pass externalFileStatus() to the merge.
• accumulate-diffs.test.ts — 5 new tests: cross-project override, no-match passthrough, empty map no-op, in-project server-diff override, in-project no-match passthrough.

Testing

• 32 bun tests pass (was 27)
• Manually verified: create a file via session then delete externally — Files Changed marks it as deleted instead of persisting

Companion: harmoniqs/amicode#845

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 91396a12-fc61-40ae-b2fd-f4b187d276a0

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}