angular

# Angular — Standalone, Signals, Zoneless (Angular 20/21+) > Build Angular the way it ships in 2026: standalone components, signals as the reactivity model, zoneless change detection, built-in control flow, and `inject()` DI. Treat NgModules, `*ngFor`, and `@Input()` decorators as legacy you only touch to migrate. ## Not this skill **AngularJS (1.x)** is out of scope entirely — this skill is Angular 2+ only and the APIs do not map. Route elsewhere for **React** → `../react/SKILL.md`; **Next.js App Router** → `../nextjs/SKILL.md`; **Vue/Nuxt, Svelte, SolidJS, Astro** → `../vue-nuxt/SKILL.md`, `../svelte/SKILL.md`, `../solid-js/SKILL.md`, `../astro/SKILL.md`; a **pure TypeScript language question** (generics, narrowing, tsconfig) with no Angular dimension → `../typescript/SKILL.md`; a **standalone NestJS API** → `../nestjs/SKILL.md`; a generic Node service → `../nodejs/SKILL.md`; **cross-framework Playwright e2e strategy** → `../testing-web/SKILL.md` / `../e2e-testing/SKILL.md`. Angular Universal SSR and Angular's own `ng test` (Vitest) setup stay here. ## Decide first | Situation | Do this | Why | |-----------|---------|-----| | Greenfield app / new feature | Zoneless + signals + standalone by default. `ng new` (Angular 21) already excludes Zone.js. | The defaults shipped stable in v20-v21; fight them and you write more code that the framework now does for you. | | Brownfield NgModule + decorator app | Migrate incrementally with the schematics in `references/migration.md`...