svelte‑store is a TypeScript utility library that extends Svelte’s built‑in readable/writable stores with richer store types – ActiveStore, Store, SafeStore, SubStore, DerivedStore and ConvertedStore – adding deep‑equality checking, cloning, active notifications, sub‑state slicing and source management. It’s aimed at Svelte developers who need more granular, immutable‑safe or mutable‑friendly state handling (e.g., nested data, derived values, or integration with existing Svelte stores) while keeping the same subscribe/set/update API.