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docs(sveltekit): update guide for SvelteKit 3 and convex-better-auth-svelte 0.10 - #448
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…svelte 0.10 - Target SvelteKit 3: src/env.ts, $app/env/public, #lib/#convex subpath imports, config in vite.config.ts. - Register the Convex URL once with initConvex() in src/hooks.ts; the .convex.site URL is derived on Convex Cloud. - Use convex-svelte instead of the legacy @mmailaender/convex-svelte fork. - Add the convexLoad transport setup and a cookiePrefix note for getToken. - Add a SvelteKit 2 section with the differences.
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expectAuth only holds requests until the first sign-in and leaves
signed-out users with a client that never sends anything. Show the
SvelteKit way instead: a redirect in handle, an {#if auth.isAuthenticated}
block around the area, and the server's auth state.
A universal +page.ts load runs again in the browser during hydration, before auth is set up, so auth-dependent queries briefly return their signed-out result. convex-svelte's convexLoadHydration handle avoids that on SvelteKit 2.56+, but doesn't support SvelteKit 3 yet. Show the getCurrentUser example as a server load, and mention the handle in the SvelteKit 2 section.
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Priority: ⬇️ Low Change: Other Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation |
|---|---|---|
| Description check |  |
The description clearly explains the SvelteKit 3 guide updates, dependency changes, authentication guidance, and migration notes. |
| Title check | |
The title clearly identifies the documentation update for SvelteKit 3 and convex-better-auth-svelte 0.10. |
| 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. |
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Inline comments:
Review comments at @docs/content/docs/framework-guides/sveltekit.mdx:
- Line 665: Update the imports in the members-only hook example: keep `redirect`
imported from `@sveltejs/kit` and import the `Handle` type separately from
`@sveltejs/kit/hooks`.
- Around line 621-623: Update the `convexLoadHydration` reference in the
SvelteKit guide so it leads to instructions showing the fetch-based hook setup
and required handle ordering, or add that setup directly to the guide for
readers implementing the `+page.ts` path.
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… convexLoadHydration setup
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Summary
@mmailaender/convex-better-auth-svelte0.10, which supports SvelteKit 2 and 3 from one release. A short "SvelteKit 2" section at the end lists the differences.convex-svelte, the package the adapter depends on, instead of the legacy@mmailaender/convex-sveltefork. With only the fork installed, apps had two copies, and the SSR token set inhooks.server.tsnever reached the adapter.expectAuthrecommendation with a SvelteKit-native way to gate members-only areas.@mmailaender/convex-better-auth-svelte0.10.0convex-svelte0.15.1 or later (convex-svelte#64); without it,npm install convex-sveltefails next to SvelteKit 3Why
SvelteKit 3 changes the setup:
$app/env/*and must be declared insrc/env.ts.vite.config.ts.$libandconfig.aliasgive way to subpath imports (#lib,#convex).The adapter's 0.10 setup changes too. It no longer reads
PUBLIC_CONVEX_URL/PUBLIC_CONVEX_SITE_URLitself. The app registers the URL once withinitConvex(), and on Convex Cloud the.convex.siteURL is derived from it.expectAuthdoesn't fit SvelteKit:convexLoadin universal loads waits for auth that only the root layout sets up.What
Changes to
framework-guides/sveltekit.mdx:convex-sveltein the install command and all imports.#convex/*subpath import instead of a$convexalias;#libinstead of$lib.src/env.tswith Cloud and Self-hosted tabs, including when to usestatic: true. Convex Cloud no longer needsPUBLIC_CONVEX_SITE_URL.createSvelteKitHandler()on Convex Cloud; self-hosted passesconvexSiteUrl.initConvex(PUBLIC_CONVEX_URL)insrc/hooks.ts.getToken(event.cookies, { cookiePrefix })for apps with a custom Better Auth cookie prefix.convexLoadwith theConvexLoadResulttransport, shown in+page.server.ts. A universal+page.tsload re-runs in the browser before auth is set up; for auth data there, the guide points to convex-svelte'sconvexLoadHydrationwith{ fetch }(convex-svelte 0.15.1, SvelteKit 2 and 3).handlerather than+layout.server.ts(SvelteKit's auth guidance){#if auth.isAuthenticated}block around the area$env/static/publicwithoutsrc/env.ts$convexalias insvelte.config.jsnpx sv migrate sveltekit-3to upgradeHow
The setup matches the adapter's demo app. Its e2e suite runs this configuration on SvelteKit 3 against a real Convex Cloud deployment, with
convex-svelte0.14 and 0.15: sign-in, SSR auth state, client navigation,convexLoad, and the auth proxy with the derived.convex.siteURL.