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---
description: 'Angular-specific coding standards and best practices'
applyTo: 'src/app/**/*.ts, src/app/**/*.html, src/app/**/*.scss, src/app/**/*.css'
---
# Angular Development Instructions
Instructions for generating high-quality Angular applications with TypeScript, using Angular Signals for state management, adhering to Angular best practices as outlined at https://angular.dev.
## Project Context
- Latest Angular version (use standalone components by default)
- TypeScript for type safety
- Angular CLI for project setup and scaffolding
- Follow Angular Style Guide (https://angular.dev/style-guide)
- Use Angular Material or other modern UI libraries for consistent styling (if specified)
## Development Standards
### Architecture
- Use standalone components unless modules are explicitly required
- Organize code by feature modules or domains for scalability
- Implement lazy loading for feature modules to optimize performance
- Use Angular's built-in dependency injection system effectively
- Structure components with a clear separation of concerns (smart vs. presentational components)
### TypeScript
- Enable strict mode in `tsconfig.json` for type safety
- Define clear interfaces and types for components, services, and models
- Use type guards and union types for robust type checking
- Implement proper error handling with RxJS operators (e.g., `catchError`)
- Use typed forms (e.g., `FormGroup`, `FormControl`) for reactive forms
### Component Design
- Follow Angular's component lifecycle hooks best practices
- When using Angular >= 19, Use `input()` `output()`, `viewChild()`, `viewChildren()`, `contentChild()` and `viewChildren()` functions instead of decorators; otherwise use decorators
- Leverage Angular's change detection strategy (default or `OnPush` for performance)
- Keep templates clean and logic in component classes or services
- Use Angular directives and pipes for reusable functionality
### Styling
- Use Angular's component-level CSS encapsulation (default: ViewEncapsulation.Emulated)
- Prefer SCSS for styling with consistent theming
- Implement responsive design using CSS Grid, Flexbox, or Angular CDK Layout utilities
- Follow Angular Material's theming guidelines if used
- Maintain accessibility (a11y) with ARIA attributes and semantic HTML
### State Management
- Use Angular Signals for reactive state management in components and services
- Leverage `signal()`, `computed()`, and `effect()` for reactive state updates
- Use writable signals for mutable state and computed signals for derived state
- Handle loading and error states with signals and proper UI feedback
- Use Angular's `AsyncPipe` to handle observables in templates when combining signals with RxJS
### Data Fetching
- Use Angular's `HttpClient` for API calls with proper typing
- Implement RxJS operators for data transformation and error handling
- Use Angular's `inject()` function for dependency injection in standalone components
- Implement caching strategies (e.g., `shareReplay` for observables)
- Store API response data in signals for reactive updates
- Handle API errors with global interceptors for consistent error handling
### Security
- Sanitize user inputs using Angular's built-in sanitization
- Implement route guards for authentication and authorization
- Use Angular's `HttpInterceptor` for CSRF protection and API authentication headers
- Validate form inputs with Angular's reactive forms and custom validators
- Follow Angular's security best practices (e.g., avoid direct DOM manipulation)
### Performance
- Enable production builds with `ng build --prod` for optimization
- Use lazy loading for routes to reduce initial bundle size
- Optimize change detection with `OnPush` strategy and signals for fine-grained reactivity
- Use trackBy in `ngFor` loops to improve rendering performance
- Implement server-side rendering (SSR) or static site generation (SSG) with Angular Universal (if specified)
### Testing
- Write unit tests for components, services, and pipes using Jasmine and Karma
- Use Angular's `TestBed` for component testing with mocked dependencies
- Test signal-based state updates using Angular's testing utilities
- Write end-to-end tests with Cypress or Playwright (if specified)
- Mock HTTP requests using `HttpClientTestingModule`
- Ensure high test coverage for critical functionality
## Implementation Process
1. Plan project structure and feature modules
2. Define TypeScript interfaces and models
3. Scaffold components, services, and pipes using Angular CLI
4. Implement data services and API integrations with signal-based state
5. Build reusable components with clear inputs and outputs
6. Add reactive forms and validation
7. Apply styling with SCSS and responsive design
8. Implement lazy-loaded routes and guards
9. Add error handling and loading states using signals
10. Write unit and end-to-end tests
11. Optimize performance and bundle size
## Additional Guidelines
- Follow Angular's naming conventions (e.g., `feature.component.ts`, `feature.service.ts`)
- Use Angular CLI commands for generating boilerplate code
- Document components and services with clear JSDoc comments
- Ensure accessibility compliance (WCAG 2.1) where applicable
- Use Angular's built-in i18n for internationalization (if specified)
- Keep code DRY by creating reusable utilities and shared modules
- Use signals consistently for state management to ensure reactive updates

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# PeerTube Client Development Instructions for Coding Agents
## Client Overview
This is the Angular frontend for PeerTube, a decentralized video hosting platform. The client is built with Angular 20+, TypeScript, and SCSS. It communicates with the PeerTube server API and provides the web interface for users, administrators, and content creators.
**Key Technologies:**
- Angular 20+ with standalone components
- TypeScript 5+
- SCSS for styling
- RxJS for reactive programming
- PrimeNg and Bootstrap for UI components
- WebdriverIO for E2E testing
- Angular CLI
## Client Build and Development Commands
### Prerequisites (for client development)
- Node.js 20+
- yarn 1
- Running PeerTube server (see ../server instructions)
### Essential Client Commands
```bash
# From the client directory:
cd /client
# 1. Install dependencies (ALWAYS first)
yarn install --pure-lockfile
# 2. Development server with hot reload
npm run dev
# 3. Build for production
npm run build
```
### Client Testing Commands
```bash
# From client directory:
npm run lint # ESLint for client code
```
### Common Client Issues and Solutions
**Angular Build Failures:**
- Always run `yarn install --pure-lockfile` after pulling changes
- Clear `node_modules` and reinstall if dependency errors occur
- Build may fail on memory issues: `NODE_OPTIONS="--max-old-space-size=4096" npm run build`
- Check TypeScript errors carefully - Angular is strict about types
**Development Server Issues:**
- Default port is 3000, ensure it's not in use
- Hot reload may fail on file permission issues
- Clear browser cache if changes don't appear
## Client Architecture and File Structure
### Client Directory Structure
```
/src/
/app/
+admin/ # Admin interface components
+my-account/ # User account management pages
+my-library/ # User's videos, playlists, subscriptions
+search/ # Search functionality and results
+shared/ # Shared Angular components, services, pipes
+standalone/ # Standalone Angular components
+videos/ # Video-related components (watch, upload, etc.)
/core/ # Core services (auth, server, notifications)
/helpers/ # Utility functions and helpers
/menu/ # Navigation menu components
/assets/ # Static assets (images, icons, etc.)
/environments/ # Environment configurations
/locale/ # Internationalization files
/sass/ # Global SCSS styles
```
### Key Client Configuration Files
- `angular.json` - Angular CLI workspace configuration
- `tsconfig.json` - TypeScript configuration for client
- `e2e/wdio*.conf.js` - WebdriverIO E2E test configurations
- `src/environments/` - Environment-specific configurations
### Shared Code with Server (`../shared/`)
The client imports TypeScript models and utilities from the shared directory:
- `../shared/models/` - Data models (Video, User, Channel, etc.). Import these in client code: `import { Video } from '@peertube/peertube-models'`
- `../shared/core-utils/` - Utility functions shared between client/server. Import these in client code: `import { ... } from '@peertube/peertube-core-utils'`
-
## Client Development Workflow
### Making Client Changes
1. **Angular Components:** Create/modify in `/src/app/` following existing patterns
2. **Shared Components:** Reusable components go in `/src/app/shared/`
3. **Services:** Core services in `/src/app/core/`, feature services with components
4. **Styles:** Component styles in `.scss` files, global styles in `/src/sass/`
5. **Assets:** Images, icons in `/src/assets/`
6. **Routing:** Routes defined in feature modules or `app-routing.module.ts`
## Trust These Instructions
These instructions are comprehensive and tested specifically for client development. Only search for additional information if:
1. Commands fail despite following instructions exactly
2. New error messages appear that aren't documented here
3. You need specific Angular implementation details not covered above
For server-side questions, refer to the server instructions in `../.github/copilot-instructions.md`.