[theoephraim]

Fixes #1267.

adapter-cloudflare 8 emulates cloudflare:workers in Node during vite dev, using wrangler's platform proxy env. That env has no __VARLOCK_ENV binding, so the Workers env loader (injected on SvelteKit 3 since #1240) hit the missing-binding error from #1236 on every SSR request.

SvelteKit's dev SSR runs in Node and loads env through varlock's normal flow, so the vite plugin now only injects the loader into builds. vite preview is unaffected since it runs the built output.

The deprecated varlockSvelteKitCloudflarePlugin passed the loader explicitly, which bypassed detection. It now calls varlockVitePlugin({ isCloudflareTarget: true }) so it gets the same behavior, and logs a deprecation warning.

Tests: new sveltekit-v3-cloudflare framework suite (SvelteKit 3 + adapter-cloudflare 8) covering vite dev, build, a fully prerendered build, and the deprecated plugin in dev and build. Without the fix its dev scenarios fail with the 500 from the issue.

[github-actions]

The changes in this PR will be included in the next version bump.

Patch releases

• @varlock/astro-integration 1.4.5 → 1.4.6 (cascade)
• @varlock/cloudflare-integration 1.6.3 → 1.6.4
• @varlock/nuxt-integration 0.1.5 → 0.1.6 (cascade)
• @varlock/vite-integration 1.5.5 → 1.5.6

Bump files in this PR

• sveltekit-cf-dev-skip-loader.md (view diff) (edit)
• sveltekit-cf-legacy-plugin.md (view diff) (edit)

Click here if you want to add another bump file to this PR

---

This comment is maintained by bumpy.

[pullfrog]

✅ No new issues found.

Reviewed changes across the full PR, including loader initialization, the deprecated wrapper, and regression coverage.

• Dev loader guard: Skips SvelteKit Cloudflare loader auto-injection for serve, retaining build-time injection and the normal Node env-loading flow.
• Deprecated wrapper: Routes varlockSvelteKitCloudflarePlugin() through shared detection and emits a once-only deprecation warning.
• Regression coverage: Adds SvelteKit 3 / adapter-cloudflare 8 dev, build, legacy-wrapper, and prerender scenarios, plus unit coverage for both SvelteKit config shapes.
• Validation: Workspace builds and all 82 Vite/Cloudflare integration tests passed. Upstream source confirms preview loads built server output. The new framework suite could not run locally because its standalone dependencies are absent (vitest: command not found) and pnpm is unavailable (pnpm: command not found); preview and deployed Worker behavior were not runtime-tested.

  ^{｜ View workflow run ｜ Using gpt-6.1-sol ｜ 𝕏}

[pkg-pr-new]

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varlock

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@varlock/astro-integration

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@varlock/cloudflare-integration

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@varlock/nuxt-integration

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@varlock/vite-integration

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@varlock/native-helper-darwin

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@varlock/native-helper-linux-arm64

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@varlock/native-helper-linux-x64

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@varlock/native-helper-win32-x64

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commit: 3500d1e