# Changelog

## [3.1.0] - 2025-06-02

### Features

- **SSR support**: Form instances are now created synchronously during render via `useMemo`, allowing the component tree to produce meaningful HTML on the server
- **`prefetchedData` prop**: Pass pre-fetched API data to `<Form />` so fields with API configurations have their response caches populated before mount
- **`iVars` and `initialValues` at creation time**: These are now passed during form instance creation (not just in `useEffect`), making them available for the `FormCore` constructor during SSR
- **Package metadata**: Added `"sideEffects": false` and `"exports"` field for proper tree-shaking and RSC compatibility
- **Test infrastructure**: Added Jest configuration and SSR test suite (12 tests)

### How SSR works

During server render, the `<Form />` component creates the `FormCore` instance synchronously in `useMemo`. Fields are registered when `AsFormFieldBuilder` mounts on the client via `useEffect`. Static props (non-template) render immediately; template props are stripped by `filterProps` and resolve after hydration when `refreshTemplates` runs.

### What renders during SSR

| Content | SSR behavior |
|---------|-------------|
| Form structure (`<form>`) | ✅ Rendered |
| Static props (label, placeholder) | ✅ Rendered |
| Template props (`${iVars.*}`) | Stripped, resolved after hydration |
| `visibility: false` fields | ✅ Correctly hidden |
| Field interactivity | Activates after hydration |