docs(react-start): serialization adapters

[m9tdev]

Added an example on how to add serialization adapters for React Start. Not 100% sure if the right place is in the server function docs. LMK otherwise!

Summary by CodeRabbit

• Documentation
  • Added a comprehensive "Custom serialization adapters" guide with a complete example (includes a bigint adapter) for handling complex types.
  • Guide published in both React and Solid server-functions guides; the React guide includes the new section in two locations for easier discovery.
  • No changes to public APIs or declarations.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Adds a new "Custom serialization adapters" documentation section to the Server Functions guides for React and Solid, including a TypeScript bigint adapter example; the React guide contains the same section inserted twice. No public API or exported declarations were changed.

Changes

Cohort / File(s)	Summary
Server Functions documentation — React docs/start/framework/react/guide/server-functions.md	Inserted a "Custom serialization adapters" section (TypeScript bigint adapter example) in two locations within the guide; shows how to create an adapter with createSerializationAdapter and register it via start configuration.
Server Functions documentation — Solid docs/start/framework/solid/guide/server-functions.md	Added a "Custom serialization adapters" section with a TypeScript bigint adapter example and instructions to register the adapter via the start configuration.

Sequence Diagram(s)

(Not applicable — documentation-only changes; no control-flow or runtime behavior changes to diagram.)

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

• Verify whether the duplicated section in docs/start/framework/react/guide/server-functions.md is intentional or should be consolidated.

Possibly related PRs

• fix: merge serializationAdapters from createStart getOptions and router.options #5321 — integrates merging of serializationAdapters from multiple sources so custom adapters documented here are preserved and combined at runtime.

Poem

🐇 I nibble docs by lantern-light,

I teach bigints to take their flight,
Two pages hum the same small song,
A tiny adapter hopping along.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs(react-start): serialization adapters' clearly and concisely identifies the primary change—adding documentation about serialization adapters to the React Start guide.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

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Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 9503de0 and 02f1439.

📒 Files selected for processing (1)

• docs/start/framework/solid/guide/server-functions.md (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/start/framework/solid/guide/server-functions.md

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[birkskyum]

@m9tdev can you add the same to the solid docs so they stay in sync?

[schiller-manuel]

we need to document serialization adapters more generally, not just for server functions. they apply for beforeLoad and loader as well. a separate doc page should be added for this. want to do this when i find the time :)

[m9tdev]

@birkskyum Should they be the same for Solid? I have no experience with Solid, but if they are the same I'll add them!

@schiller-manuel Maybe we can add this in the meantime to save others some time when looking for it.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 86875e6

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☁️ Nx Cloud last updated this comment at 2025-11-18 10:43:12 UTC

[birkskyum]

Yes it's the same for solid, except for the package name being solid-start

[m9tdev]

@birkskyum done! There was nothing in there yet (except some frontmatter), but I've added it for Solid.

[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between e1ba504 and 9503de0.

📒 Files selected for processing (2)

• docs/start/framework/react/guide/server-functions.md (1 hunks)
• docs/start/framework/solid/guide/server-functions.md (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/start/framework/react/guide/server-functions.md

🧰 Additional context used

📓 Path-based instructions (1)

docs/**/*.md

📄 CodeRabbit inference engine (AGENTS.md)

Use relative internal documentation links relative to docs/ folder (e.g., ./guide/data-loading)

Files:

• docs/start/framework/solid/guide/server-functions.md

🧠 Learnings (2)

📚 Learning: 2025-11-25T00:18:21.258Z

Learnt from: CR
Repo: TanStack/router PR: 0
File: AGENTS.md:0-0
Timestamp: 2025-11-25T00:18:21.258Z
Learning: Applies to packages/solid-router/**/*.{ts,tsx} : Solid Router components and primitives should use the tanstack/solid-router package

Applied to files:

• docs/start/framework/solid/guide/server-functions.md

📚 Learning: 2025-11-25T00:18:21.258Z

Learnt from: CR
Repo: TanStack/router PR: 0
File: AGENTS.md:0-0
Timestamp: 2025-11-25T00:18:21.258Z
Learning: Applies to packages/react-router/**/*.{ts,tsx} : React Router components and hooks should use the tanstack/react-router package

Applied to files:

• docs/start/framework/solid/guide/server-functions.md