docs(react): add reference page for useTransform

[mixelburg]

Fixes #2075

The useTransform hook is referenced in docs/config.json and linked from the SSR guide, but the file docs/framework/react/reference/functions/useTransform.md was missing — causing the API reference link to redirect to the framework root page.

This adds the missing reference page with:

• Type signature matching the actual implementation in the meta-framework adapter packages
• Description of parameters and return value
• A usage example
• Notes clarifying which packages export this hook and a link to the full SSR guide

Summary by CodeRabbit

• Documentation
  • Added documentation for the useTransform() hook, including usage examples and SSR integration guidance.

[coderabbitai]

📝 Walkthrough

Walkthrough

Added a new documentation page for the useTransform() React hook at docs/framework/react/reference/functions/useTransform.md. The documentation includes the TypeScript signature, parameter descriptions, return type, usage example, and notes on where the hook is exported from adapter packages.

Changes

Cohort / File(s)	Summary
useTransform Documentation docs/framework/react/reference/functions/useTransform.md	New documentation page defining useTransform(fn, deps?) hook for SSR meta-framework adapters, including TypeScript signature, parameters, return type, usage example, and links to SSR guide and implementation source.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A hook once lost in the digital maze,
Now documented in shining phase!
useTransform emerges from the dark,
Guiding SSR with a reference spark ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR description clearly explains the fix, references the linked issue (#2075), and details the content added. However, the description template's required checklist is not completed.	Complete the checklist items (Contributing guide confirmation and pnpm test:pr confirmation) and indicate whether this is docs-only or requires a changeset.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'docs(react): add reference page for useTransform' accurately and concisely describes the main change in the PR—adding a missing documentation page for the useTransform hook.
Linked Issues check	✅ Passed	The PR successfully addresses issue #2075 by adding the missing useTransform reference page with type signature, parameter descriptions, usage example, and notes about exporting packages.
Out of Scope Changes check	✅ Passed	All changes are limited to adding the missing useTransform.md documentation file, which is directly in scope for resolving issue #2075 about the missing reference page.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@docs/framework/react/reference/functions/useTransform.md`:
- Around line 21-25: The docs mention calling mergeForm(baseForm, serverState)
but don't state its import source; update the useTransform documentation to
explicitly note that mergeForm is exported from `@tanstack/form-core` (e.g.,
"import { mergeForm } from '@tanstack/form-core'") and clarify that it is not
provided by adapter packages, referencing the function name mergeForm and the
hook useTransform to help locate the text to change.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1e9f2513-e51b-48ad-9d2f-e767cc757914

📥 Commits

Reviewing files that changed from the base of the PR and between e21cc01 and 650f30a.

📒 Files selected for processing (1)

• docs/framework/react/reference/functions/useTransform.md

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
# Description: Verify that mergeForm is exported from adapter packages

# Search for mergeForm exports in adapter packages
echo "=== Searching for mergeForm in react-form-start ==="
fd -t f -e ts -e tsx . packages/react-form-start --exec rg -n "export.*mergeForm"

echo -e "\n=== Searching for mergeForm in react-form-nextjs ==="
fd -t f -e ts -e tsx . packages/react-form-nextjs --exec rg -n "export.*mergeForm"

echo -e "\n=== Searching for mergeForm in react-form-remix ==="
fd -t f -e ts -e tsx . packages/react-form-remix --exec rg -n "export.*mergeForm"

echo -e "\n=== Searching for mergeForm definition ==="
rg -n "function mergeForm|const mergeForm|export.*mergeForm" --type ts

Repository: TanStack/form

Length of output: 387

---

Clarify the import source for mergeForm in the documentation.

The description references mergeForm(baseForm, serverState) but does not specify where to import it from. mergeForm is exported from @tanstack/form-core, not from the adapter packages. Update the documentation to clearly indicate the correct import source to prevent user confusion.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@docs/framework/react/reference/functions/useTransform.md` around lines 21 -
25, The docs mention calling mergeForm(baseForm, serverState) but don't state
its import source; update the useTransform documentation to explicitly note that
mergeForm is exported from `@tanstack/form-core` (e.g., "import { mergeForm } from
'@tanstack/form-core'") and clarify that it is not provided by adapter packages,
referencing the function name mergeForm and the hook useTransform to help locate
the text to change.