Add @vitejs/plugin-react-swc/preamble virtual module for SSR HMR (#890)
SSR applications can now initialize HMR runtime by importing @vitejs/plugin-react-swc/preamble at the top of their client entry instead of manually calling transformIndexHtml. This simplifies SSR setup for applications that don't use the transformIndexHtml API.
Use SWC when useAtYourOwnRisk_mutateSwcOptions is provided (#951)
Previously, this plugin did not use SWC if plugins were not provided even if useAtYourOwnRisk_mutateSwcOptions was provided. This is now fixed.