Vue

Builds, debugs, and reviews Vue 3 apps: reactivity, components, composables, Pinia state, Vue Router, forms, and performance. Use when the UI does not update after a state change, a reactive object loses reactivity on destructure or reassignment, .value is forgotten, a watcher never fires or loops ("Maximum recursive updates exceeded"), props or v-model stop syncing, a template ref is null, SSR reports a hydration mismatch, a route param change does not reload the component, Pinia warns "getActivePinia() was called but there was no active Pinia", the console shows "Failed to resolve component" or "Extraneous non-props attributes", a thrown error blanks the page, a long list or large object makes typing lag, a chart or map library breaks after being put in ref(), scoped styles do not reach a child, or when migrating Vue 2 Options API to Composition API and script setup. Not for Nuxt-specific SSR, routing, and data fetching (nuxt), Vite build configuration (vite), or React and Svelte (react, svelte).