Svelte

Builds, debugs, and reviews Svelte and SvelteKit apps: runes, stores, snippets, load functions, form actions, adapters. Use when the UI does not update after a state change, an effect loops forever ("effect_update_depth_exceeded"), props or bindings stop reacting, a Map or class field is not tracked, state leaks between users on the server, "window is not defined" breaks the build, markup mismatches on hydration, data stays stale after a mutation, a form action does nothing or returns 403, scoped CSS is pruned as an unused selector, transitions never fire, or a Node, Vercel, Cloudflare, or sta