name: new-component description: Scaffold a new Angular component with test file following project conventions. Use when creating new components, widgets, or UI elements.

New Component Skill

Generate Angular standalone components following hnews project patterns.

File Structure

Create two files:

• src/app/components/{component-name}/{component-name}.component.ts
• src/app/components/{component-name}/{component-name}.component.spec.ts

For shared/reusable widgets, use src/app/components/shared/{component-name}/.

Component Template

// SPDX-License-Identifier: MIT
// Copyright (C) 2025 Alysson Souza
import { Component, ChangeDetectionStrategy, input, output } from '@angular/core';

@Component({
  selector: 'app-{component-name}',
  changeDetection: ChangeDetectionStrategy.OnPush,
  imports: [],
  template: `
    <!-- Template here -->
  `,
  styles: [
    `
      @reference '../../../styles.css';

      :host {
        @apply contents;
      }
    `,
  ],
})
export class {ComponentName}Component {
  // Use signal-based inputs/outputs
  readonly someInput = input<string>('');
  readonly someOutput = output<void>();
}

Test Template

// SPDX-License-Identifier: MIT
// Copyright (C) 2025 Alysson Souza
import { ComponentFixture, TestBed } from '@angular/core/testing';
import { {ComponentName}Component } from './{component-name}.component';

describe('{ComponentName}Component', () => {
  let component: {ComponentName}Component;
  let fixture: ComponentFixture<{ComponentName}Component>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      imports: [{ComponentName}Component],
    }).compileComponents();

    fixture = TestBed.createComponent({ComponentName}Component);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });

  // Set inputs using fixture.componentRef.setInput('inputName', value)
});

Key Conventions

1. No standalone: true — It's the default in Angular 20+
2. Use ChangeDetectionStrategy.OnPush always
3. Signal-based APIs: Use input(), output(), viewChild() instead of decorators
4. Styles reference: Use @reference '../../../styles.css'; (adjust path depth)
5. Tailwind: Use @apply for component styles
6. Dark mode: Include .dark: variants for colors
7. Selector prefix: Always app- (kebab-case)
8. Class suffix: {Name}Component

After Creation

Run ng test --include src/app/components/{component-name}/{component-name}.component.spec.ts to verify.