vue_3

Vue 3 composables share state by encapsulating reactive logic in functions and returning plain refs. You import these composables into multiple components to maintain shared state while structuring code for maintainability and avoiding direct computed value mutations.

The best way to handle dependency injection in Vue 3 is using the provide and inject pattern. This allows parent components to supply reactive data or services to deeply nested child components cleanly without prop drilling.

KeepAlive in Vue 3 caches dynamic component instances instead of destroying them. Wrapping dynamic components in KeepAlive preserves their internal state and prevents expensive re-initialization when toggling between them.

Composables should return plain refs in Vue 3 to maintain explicit reactivity tracking and ensure structural maintainability. This constraint prevents unintended side effects and keeps reactive state interactions predictable across components.

You need the Vue 3 Composition API when organizing complex component logic into reusable composables. It solves maintainability issues by grouping related reactive state, computed properties, and lifecycle hooks logically rather than separating them by option type.