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Katerina Skroumpelou 20649d2374 docs: fix confusing loader snippets in Remix and React Router SSR client guide (#47685)
## Summary

Fixes the Remix and React Router sections of the SSR "creating a client"
guide, which showed three separate `_index.tsx` snippets (Loader,
Action, Component) with two different `loader` exports that cannot
coexist in one route, leaving readers unsure which to use.

Each framework now has a short intro plus a single coherent
`_index.tsx`: one `loader` that creates the server client and returns
the env vars, one `action`, and a browser-client component that reads
those env vars via `useLoaderData`. Along the way this also fixes three
React Router bugs: the invalid `'@react-router'` import, the dropped
cookie `options` argument in `setAll`, and the incomplete `return ...`
in the component.

One thing worth a reviewer check: a loader that both sets cookies and
returns data must return through the `json` (Remix) / `data` (React
Router v7) helper with `{ headers }` rather than a plain object, so the
`Set-Cookie` headers are preserved.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

## Summary by CodeRabbit

* **Documentation**
* Updated the server-side “creating a client” guide for Remix and React
Router SSR examples.
* Refreshed the example structure to a single end-to-end route setup
with `loader`, `action`, and one default page component.
* Improved SSR cookie and header handling to better match practical
server/client behavior.
* Passes the required Supabase URL and publishable key from the server
to the browser so the client can be initialized with `useLoaderData`.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: Miranda Limonczenko <miranda.limonczenko@supabase.io>
2026-07-13 15:06:15 +03:00
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