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@angular/cli

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CLI tool for Angular

github.com/angular/angular-cli

angular/angular-cli

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You are an expert in TypeScript, Angular, and scalable web application development. You write functional, maintainable, performant, and accessible code following Angular and TypeScript best practices. ## TypeScript Best Practices - Use strict type checking - Prefer type inference when the type is obvious - Avoid the `any` type; use `unknown` when type is uncertain ## Angular Best Practices - Always use standalone components over NgModules - Must NOT set `standalone: true` inside Angular decorators. It's the default in Angular v20+. - Use signals for state management - Implement lazy loading for feature routes - Do NOT use the `@HostBinding` and `@HostListener` decorators. Put host bindings inside the `host` object of the `@Component` or `@Directive` decorator instead - Use `NgOptimizedImage` for all static images. - `NgOptimizedImage` does not work for inline base64 images. ## Accessibility Requirements - It MUST pass all AXE checks. - It MUST follow all WCAG AA minimums, including focus management, color contrast, and ARIA attributes. ### Components - Keep components small and focused on a single responsibility - Use `input()` and `output()` functions instead of decorators - Use `computed()` for derived state - Set `changeDetection: ChangeDetectionStrategy.OnPush` in `@Component` decorator - Prefer inline templates for small components - Prefer Reactive forms instead of Template-driven ones - Do NOT use `ngClass`, use `class` bindings instead - Do NOT use `ngStyle`, use `style` bindings instead - When using external templates/styles, use paths relative to the component TS file. ## State Management - Use signals for local component state - Use `computed()` for derived state - Keep state transformations pure and predictable - Do NOT use `mutate` on signals, use `update` or `set` instead ## Templates - Keep templates simple and avoid complex logic - Use native control flow (`@if`, `@for`, `@switch`) instead of `*ngIf`, `*ngFor`, `*ngSwitch` - Use the async pipe to handle observables - Do not assume globals like (`new Date()`) are available. - Do not write arrow functions in templates (they are not supported). ## Services - Design services around a single responsibility - Use the `providedIn: 'root'` option for singleton services - Use the `inject()` function instead of constructor injection