React 16 and 17 compatibility

Speakeasy Elements now supports React 16 and 17 applications through a new Vite plugin that polyfills React 18 APIs. Applications running older React versions can add a single line to their Vite config to automatically polyfill useSyncExternalStore, useId, useInsertionEffect, startTransition, useTransition, and useDeferredValue — all React 18 APIs used by Elements and its dependencies.

Features

React compatibility Vite plugin #1422 - Added reactCompat() Vite plugin for React 16 and 17 support. Import and add to the Vite config to polyfill React 18 APIs automatically. (Author: @adaam2)