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perf(host): cut the console's first-load script by 30% by splitting it per page (MMR-583) - #513
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📝 Summary
Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 8 files. (1 skipped: 1… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly and concisely describes the main change: splitting console pages to reduce the host's first-load script size. Description check The description is directly related to the changeset and explains the chunk splitting, lazy sheet loading, PWA handling, measurements, and verification results. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 8 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 2
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Inline comments:
Review comments at @packages/host/src/components/lazy-sheet.tsx:
- Around line 36-39: Update the lazySheet failure handler to detect
missing-chunk errors and trigger a page reload at most once; keep
closeAfterFailedLoad and the existing close-and-retry behavior for all other
failures.
Review comments at @packages/host/src/lib/chunk-warmup.ts:
- Line 48: Update the requestIdleCallback call that schedules warmChunks to
include a timeout, allowing required chunk warm-up to start even if the browser
does not reach idle time promptly.
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📒 Files selected for processing: 9
.changes/mmr-583.mdpackages/host/src/components/jump-palette.tsxpackages/host/src/components/lazy-sheet.tsxpackages/host/src/components/project-picker.tsxpackages/host/src/lib/chunk-warmup.tspackages/host/src/router.tsxpackages/host/src/start-router.tsxpackages/host/src/test/chunk-warmup.test.tspackages/host/src/test/lazy-sheet.test.tsx
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… idle (MMR-583) Each route page loads through lazyRouteComponent, and the shell's New task and New project sheets load on first open, so the initial script drops from 1,187 kB to 831 kB (355 to 264 kB gzip) and no chunk crosses Vite's 500 kB warning. An idle warm-up loads every split chunk, so a tab left on an old build after another tab applies an update never requests an evicted chunk.
…d load (MMR-583) A sheet that mounted already open skipped Base UI's starting transition, and a rejected React.lazy import failed the whole shell. The sheet now loads when the shell mounts, mounts closed, and retries a failed load on its next open.
… the next open retries (MMR-583)
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The console shipped as one 1.19 MB script (355 kB gzip), and every build warned that it was over Vite's 500 kB chunk limit. All twelve pages loaded on first paint. So did the New task and New project sheets and the form library behind them, even though a visitor might open none of them.
Each page now loads as its own chunk, and the two shell sheets load right after the shell mounts. The first load drops to 831 kB of script (264 kB gzip), 30% less, and no chunk crosses the limit. The limit itself is unchanged.
The rest of the initial payload is code the shell needs at first paint: react-dom (199 KiB), zod for the contract schemas (90 KiB), Base UI's dialog, popover, and menu, and the router and query libraries.
Splitting created one PWA risk, which this PR closes. After you apply an update in one tab, the other tabs stay on the old build, but Workbox has already evicted that build's precache. A chunk those tabs had not fetched yet would now 404. So once the console is idle, it loads every split chunk, and an open tab keeps its whole build in memory as it did with one bundle. If a page chunk still goes missing, TanStack's reload-once handling covers it. If a sheet fails to load, the shell stays up and retries on the next open.
Verification:
bun run verify,test:pwa(2/2), andtest:host(7/7, including the container) pass.data-starting-style), take focus, and close cleanly.Made with Claude Opus 5.5 in Claude Code.