fix(solid-query/examples): guard prefetchQuery with isServer in solid-start-streaming

[IdhayaBastine15]

What

Adds an isServer guard around the prefetchQuery call in the solid-start-streaming example's /prefetch route.

Why

• Fixes when using preload in solidstart, the query runs again on the client #8840. SolidStart calls route.preload() on both the server and the client during hydration on a fresh page load, not just the server. The example's app.tsx creates a new QueryClient inside the component, so the client gets its own empty instance on every render. When preload() fired there too, prefetchQuery hit that empty cache and made a real network request in the browser, duplicating the fetch that already happened server-side. The component's own useQuery call Solid's resource streaming. It was only the extra manual prefetchQuery call in preload that had no guard.

• This same pattern with the same missing guard already existed in this file before my change, so this isn't a new pattern I'm introducing, it's fixing an existing one.

How I checked this

• Curled /prefetch on a clean server start and confirmed fetchUser.start only logged once in the server terminal, with the rendered HTML containing the expected user data, so server-side prefetching still works after the change.

• I also confirmed isServer from solid-js/web isn't a runtime check, it's a build constant: false in the client bundle (solid-js/web/dist/dev.js) and true in the server bundle (solid-js/web/dist/server.js). So the guarded prefetchQuery call is excluded from the client bundle entirely, not just skipped at runtime. This is the same mechanism solid-query already relies on internally in useBaseQuery.ts.

• Then I ran the example directly and tested it by hand: hard-refreshed /prefetch with the browser console open. Before the fix, [api] fetchUser.start showed up in the browser console on every hard refresh, meaning the client was refetching. After adding the guard, that log only appears in the server terminal, never in the browser.

Test plan

• pnpm run dev inside examples/solid/solid-start-streaming
• Hard refresh /prefetch
• Confirm [api] fetchUser.start no longer shows up in the browser console, only in the server terminal

Summary by CodeRabbit

• Bug Fixes
  • Improved route data loading during initial page startup by avoiding unnecessary client-side user-information requests.
  • Preserved user-data preloading during server rendering, navigation, and hover-based route previews.
  • Maintained the existing 15-second cache behavior to reduce repeated requests and improve loading performance.
  • Prevented duplicate data fetching when the page is hydrated in the browser.

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ℹ️ Recent review info

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• examples/solid/solid-start-streaming/src/routes/prefetch.tsx

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📝 Walkthrough

Walkthrough

The SolidStart route now receives the preload intent. During client hydration, it skips user-info prefetching. Server loads, non-initial preloads, and navigations still prefetch user data. A patch Changeset documents the update.

Changes

SolidStart prefetch flow

Layer / File(s)	Summary
Runtime- and intent-aware route prefetch examples/solid/solid-start-streaming/src/routes/prefetch.tsx, .changeset/slimy-peaches-pull.md	route.load receives RoutePreloadFuncArgs. It creates a query client and prefetches user data when running on the server or when intent is not "initial". The 15-second cache remains configured. The Changeset records the patch release.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 4e718

The hydration guard behaves as intended and no actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: adding an isServer guard around prefetchQuery in the SolidStart streaming example.
Description check	✅ Passed	The description explains what changed, why it changed, and how it was tested. It does not use the template headings or include the checklist and release-impact sections, but it provides the required c…
Linked Issues check	✅ Passed	Issue #8840 requires preventing the duplicate client request during the initial server-request hydration while preserving server-side prefetching. In `examples/solid/solid-start-streaming/src/routes/p…
Out of Scope Changes check	✅ Passed	The pull request changes only the affected SolidStart streaming example route and adds a changeset that documents the fix for issue #8840. These changes directly support the reported behavior and do n…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…

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Actionable comments posted: 1

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Inline comments:
In `@examples/solid/solid-start-streaming/src/routes/prefetch.tsx`:
- Around line 12-18: Update the prefetch logic around useQueryClient and
userInfoQueryOpts so browser link-hover preloads still call prefetchQuery while
the initial hydration path remains skipped; use the callback’s intent to
distinguish hydration from hover/navigation rather than gating solely on
isServer.

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ℹ️ Review info

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Run ID: 52f3d060-9d1d-49bf-b4a4-be724683cc18

📥 Commits

Reviewing files that changed from the base of the PR and between 40321a0 and 7043da6.

📒 Files selected for processing (1)

• examples/solid/solid-start-streaming/src/routes/prefetch.tsx

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

[IdhayaBastine15]

Hi @birkskyum , whenever you get a chance, would appreciate a look at this, CodeRabbit's automated review came back clean after the fix. No rush.

[birkskyum]

@IdhayaBastine15 changeset missing.

[IdhayaBastine15]

@birkskyum Thanks for the flag, added it. Went with an empty changeset (--empty flag) since this only touches examples/, no package needs a version bump. Let me know if you'd rather have it tied to @tanstack/solid-query instead, happy to change it.