fix(dev): close vite hmr upgrades that arrive before vite attaches - #1588
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CLI benchmark
Full report
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| Setting | Value |
|---|---|
| Baseline | ref:d32f8987217f44fa13dcdcc4b4e56fc94b1884d8 (v4.0.0-alpha.1) |
| Head | local packages/nuxt-cli at 0c424ff (v4.0.0-alpha.1) |
| Node | v24.21.0 |
| OS | Linux 6.17.0 (kernel 6.17.0-1022-azure) |
| CPU | AMD EPYC 7763 64-Core Processor x 4 |
| Memory | 15.6 GB |
| Load average at start | 1.62, 0.59, 0.21 |
| Run started | 2026-10-03T14:56:11.329Z |
Cold CLI startup
Median of 15 interleaved runs per command, one warmup discarded.
| Command | baseline v4.0.0-alpha.1 median | head v4.0.0-alpha.1 median | Delta | baseline v4.0.0-alpha.1 min / p95 | head v4.0.0-alpha.1 min / p95 |
|---|---|---|---|---|---|
nuxt --version |
86 ms | 86 ms | -0.7% | 82 ms / 88 ms | 83 ms / 88 ms |
nuxt --version (first output byte) |
82 ms | 81 ms | -0.6% | 77 ms / 83 ms | 78 ms / 83 ms |
nuxt --help |
141 ms | 141 ms | +0.1% | 138 ms / 144 ms | 136 ms / 144 ms |
nuxt --help (first output byte) |
136 ms | 136 ms | +0.1% | 133 ms / 138 ms | 131 ms / 139 ms |
nuxt dev --help |
100 ms | 99 ms | -0.3% | 97 ms / 105 ms | 97 ms / 105 ms |
nuxt dev --help (first output byte) |
95 ms | 95 ms | -0.3% | 92 ms / 100 ms | 92 ms / 101 ms |
nuxt <unknown-command> (no-op) |
151 ms | 151 ms | -0.2% | 148 ms / 158 ms | 147 ms / 153 ms |
nuxt <unknown-command> (no-op) (first output byte) |
145 ms | 145 ms | -0.3% | 142 ms / 153 ms | 141 ms / 147 ms |
Module load cost
Counted with a module.registerHooks load hook, compile cache disabled. Counts every JS module actually evaluated on that code path (built-ins excluded, native addons excluded).
| Command | baseline v4.0.0-alpha.1 modules | head v4.0.0-alpha.1 modules | Delta | baseline v4.0.0-alpha.1 source bytes | head v4.0.0-alpha.1 source bytes | Delta |
|---|---|---|---|---|---|---|
nuxt --version |
36 | 36 | 0.0% | 297.8 kB | 297.8 kB | 0.0% |
nuxt --help |
144 | 144 | 0.0% | 956.6 kB | 956.6 kB | 0.0% |
nuxt dev --help |
63 | 63 | 0.0% | 452.9 kB | 452.9 kB | 0.0% |
Install footprint and published tarball
Each version installed on its own into an empty project with nothing but @nuxt/cli as a dependency, so the tree is exactly the CLI and its transitive dependencies. npm cache is warm and the registry is only consulted for metadata, so install wall time is indicative, not a network benchmark.
| Metric | baseline v4.0.0-alpha.1 | head v4.0.0-alpha.1 | Delta |
|---|---|---|---|
Direct dependencies of @nuxt/cli |
23 | 23 | 0.0% |
| Packages in the installed tree (unique name@version) | 39 | 39 | 0.0% |
| Unique package names | 39 | 39 | 0.0% |
| Package directories on disk (cross-check) | 32 | 32 | 0.0% |
Installed node_modules on disk |
2.42 MB | 2.43 MB | +0.0% |
| Installed files | 432 | 432 | 0.0% |
| Install wall time (warm npm cache, median of 3) | 1.26 s | 1.24 s | -1.3% |
| Published tarball (packed) | 239.0 kB | 239.3 kB | +0.1% |
| Published tarball (unpacked) | 773.3 kB | 774.2 kB | +0.1% |
| Files in tarball | 97 | 97 | 0.0% |
Interleaved runs on a shared runner: trust the deltas, not the absolute timings. The dev, restart and build suites run locally via pnpm bench:cli.
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe dev server now registers an upgrade listener regardless of whether Nuxt exposes an upgrade handler. It closes Vite HMR upgrades received before Vite attaches its listener, forwards matching upgrades after attachment, and routes other upgrades to Nuxt when supported. Tests cover startup, reload, Vite handling, and webpack or rspack builders. Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The change routes Vite HMR WebSocket upgrades during dev-server startup and reload. No concrete merge-blocking risk was found in the supplied evidence. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change improves recovery for early HMR connections, but the always-registered upgrade listener can retain connections that no handler accepts. This creates a conditional resource-exhaustion risk for reachable development servers, not a demonstrated authentication bypass. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @packages/nuxt-cli/src/dev/utils.ts:
- Line 1148: Update the expectsViteHmr branch to return only when the request
matches Vite’s effective HMR pathname, including configured hmr.path or ws.path,
and uses the accepted vite-hmr or vite-ping WebSocket subprotocol. Route or
destroy other upgrade requests instead of leaving them pending.
- Line 1150: Update the upgrade-request handling condition near the
listener-count check to use a Vite-specific readiness signal instead of
comparing the total upgrade-listener count with upgradeListenersBeforeVite.
Ensure matching asset-path requests destroy the socket until Vite’s server is
attached, regardless of unrelated upgrade listeners.
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📒 Files selected for processing (2)
packages/nuxt-cli/src/dev/utils.tspackages/nuxt-cli/test/unit/dev/lifecycle.spec.ts
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…aim upgrades vite accepts
1 participant
🔗 Linked issue
resolves #1585
📚 Description
when the dev server restarts, an open tab can get stuck on
server connection lost. Polling for restart...and never reload. this is because we start listening (and register ourupgradehandler) before vite creates its dev server, so vite'svite-pingcan stay pending forever.this PR destroys HMR upgrades that arrive before vite has attached, so the client gets an error and retries.
because we now always register the handler, we can also simplify nuxt/nuxt#36387).