What are composables in Nuxt?

javascript

// composables/useCounter.ts
export const useCounter = () => {
  const count = useState("counter", () => 0);
  
  const increment = () => count.value++;
  const decrement = () => count.value--;
  
  return {
    count,
    increment,
    decrement
  };
};

// Usage in any component (auto-imported!)
const { count, increment } = useCounter();

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