Pinia 4.0.2 — the official Vue.js state management library. Covers store definition (Options and Setup APIs), reactive state with $patch/$subscribe/$reset, getters, actions, plugins, SSR hydration, storeToRefs, map helpers for Options API components, HMR, and build-less browser usage via CDN (IIFE and ESM builds). Use when working with Pinia stores, state management in Vue 3 apps, migrating from Vuex, or debugging reactive store issues.
