Question

When is a module-level composable singleton enough instead of Pinia?

const state = reactive({ items: [] });
export function useCart() { return { items: readonly(state.items), add } }

Accepted Answer

In a client-only app with simple shared state, when you don't need devtools, plugins or SSR safety

Answer

Never; singletons don't work in Vue

Answer

Always; Pinia offers nothing extra

When is a module-level composable singleton enough instead of Pinia?

Explanation