We've already learnt a lot about svelte's reactivity system — the primary way to work with state in svelte components. But not all state belongs in components — sometimes we want app-global state (think state manager), sometimes we just want to reuse logic between components. React has hooks, Vue has composables. For svelte, the problem is even harder — reactive state only works inside component files, so the rest is handled by a completely separate mechanism — stores. The tutorial do...
