Internal published runtime package: the SvelteKit + Vite preview UI that powers @better-svelte-email/cli.
It is published to npm so the CLI can depend on it, but it is not meant to be installed or used directly by end users. Use the CLI (bse) instead, or the SvelteKit integration in @better-svelte-email/preview.
Role in the monorepo
bun run dev — local Vite/SvelteKit dev server for iterating on the preview workbench
bun run build — production build (adapter-node) for the published preview runtime package
In this monorepo, --preview-dev exists for working on the preview UI itself. Outside the monorepo, the CLI consumes the published runtime package automatically.