flushBuffers() references a `lastConsoleFlushed` cursor at server.ts:337
and assigns it at :344, but the `let lastConsoleFlushed = 0;`
declaration is missing — only the network and dialog siblings are
declared at lines 327-328.
Result: every 1-second flushBuffers tick (line 376) throws
`ReferenceError: lastConsoleFlushed is not defined`, gets swallowed by
the catch at line 369 ("[browse] Buffer flush failed: ..."), and the
console branch's append never runs. browse-console.log is never
written in any production deployment since this regressed.
Discovered by stress-testing the daemon with 15 concurrent CLIs against
cold state — the race surfaced the buffer-flush error spam in one
spawned daemon's stderr. Verified by running the daemon against a real
file:// page with console.log events: in-memory `browse console`
returns the entries, but `.gstack/browse-console.log` is never created
on disk.
Regression introduced by 1a100a2a "fix: eliminate duplicate command
sets in chain, improve flush perf and type safety" — the flush refactor
switched from `Bun.write` to `fs.appendFileSync` and added the
`lastConsoleFlushed` cursor pattern alongside its network/dialog
siblings, but missed the matching `let` declaration. Tests don't
currently exercise flushBuffers, so the regression shipped silently.
Fix:
- Declare `let lastConsoleFlushed = 0;` next to `lastNetworkFlushed`
and `lastDialogFlushed` (browse/src/server.ts:327)
- Add a source-level guard test
(browse/test/server-flush-trackers.test.ts) that fails any future
refactor that adds a fourth `last*Flushed` cursor without the
matching declaration. Same pattern as terminal-agent.test.ts and
dual-listener.test.ts — read source as text, assert invariant, no
daemon required.
Test plan:
- [x] New regression test fails on current main, passes with the fix
- [x] `bun run build` clean
- [x] Manual smoke: spawn daemon -> goto file:// page with
console.log -> wait 4s -> .gstack/browse-console.log now
exists with the expected entries (163 bytes vs zero before)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Yashwant Kotipalli