fix(studio-desktop): probe ports with node:net, not Bun.listen#615
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fix(studio-desktop): probe ports with node:net, not Bun.listen#615Necmttn wants to merge 2 commits into
Necmttn wants to merge 2 commits into
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The Electron MAIN process runs under Node, not Bun, so `Bun` is `undefined`
there. `AxDaemonArbitration.portFree` used `Bun.listen`, so the bind probe threw
on every call and `probePortsFree` was permanently `false`. With `portsFree`
always false, `decideArbitration` could never return `spawn` - on a clean machine
it returned `conflict` ("ports occupied by an unhealthy process; not starting
backend") and the app never started its own surreal + ax serve. The packaged app
then surfaced that conflict via a modal during bootstrap and crashed.
Use Node's `net.createServer().listen({ exclusive: true })` instead (runtime that
actually hosts this code), resolving `false` on bind error. The `attach` path was
unaffected (HTTP probes), which is why pre-starting a CLI daemon was a working
workaround.
Verified: arbitration suite green; node:net detects free vs occupied ports under
the Node runtime (a held :8521 reports EADDRINUSE / occupied).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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This was referenced Jun 28, 2026
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Fixes #614.
Bug
AxDaemonArbitration.portFreeprobed port availability withBun.listen, but the Electron main process runs under Node, not Bun —Bunisundefinedthere. Every bind probe threw →probePortsFreewas permanentlyfalse→decideArbitrationcould never returnspawn:…with
lsofshowing nothing on 8521/1738. So on a clean machine the app never started its own backend; the packaged app surfaced the conflict via a bootstrap modal and crashed.Fix
Use Node's
net.createServer().listen({ host: "127.0.0.1", port, exclusive: true })— the runtime that actually hosts this code — resolvingfalseon bind error. Total, never fails. Theattachpath (HTTP probes) was unaffected, which is why pre-starting a CLI daemon worked around it.Verify
tscclean.node:netcorrectly detects free vs occupied ports under the Node runtime (a held:8521reportsEADDRINUSE).Note: this is one of two issues behind the desktop crash. The other — the installed app failing with
Cannot find module 'electron-updater'— is a stale build; current source already bundles electron-updater (require('electron-updater')count = 0 in a freshmain.cjs). A rebuilt app picks up both.🤖 Generated with Claude Code