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Frameworks & web · #svelte
Learn how to add a global, SSR‑safe theme toggle to a Svelte app. Use a writable store, persist to localStorage on the client, and keep the UI reactive across all components.
When a Svelte component’s <code>$:</code> block runs too often, performance suffers. Derived stores offer memoized, source‑driven recomputation. This blog contrasts reactive statements and derived stores, shows a counter example, and gives a clear checklist for choosing the right tool.