angular-elements

Files (5)

• SKILL.md
• _INDEX.md · references/discussions/
• _INDEX.md · references/docs/
• _INDEX.md · references/issues/
• _INDEX.md · references/releases/

SKILL.md (first lines)

# @angular/elements

**Version:** Angular 21 (2025)
**Tags:** Web Components, Custom Elements, Micro-frontends

**References:** [Elements Guide](https://angular.dev/guide/elements) • [API](https://angular.dev/api/elements)

## API Changes

This section documents recent version-specific API changes.

- NEW: createCustomElement API — Package Angular components as custom elements

- NEW: NgElementConfig — Configure custom element behavior

- NEW: Input/Output mapping — Map Angular inputs/outputs to web component attributes

- NEW: Standalone elements — Build standalone elements without NgModule

## Best Practices

- Install @angular/elements

```bash
npm install @angular/elements
```

- Create custom element from component

```ts
import { createCustomElement } from '@angular/elements';

@Injectable()
export class ElementRegistrar {
  constructor(private injector: Injector) {}

  register() {
    const element = createCustomElement(MyComponent, { injector: this.injector });
    customElements.define('my-element', element);
  }
}
```

- Use in main.ts

```ts
import { createApplication } from '@angular/platform-browser';
import { createCustomElement } from '@angular/elements';

bootstrapApplication(AppComponent).then(appRef => {
  const element = createCustomElement(MyComponent, { injector: appRef.injector });
  customElements.define('my-component', element);
});
```

- Map inputs and outputs

```ts
const element = createCustomElement(MyComponent, {
  injector: this.injector,
  events: ['myEvent'],
  attributes: ['myInput']
});
```

- Use CUSTOM_ELEMENTS_SCHEMA

```ts
// To use custom elements in Angular
import { CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';

@NgModule({
  schemas: [CUSTOM_ELEMENTS_SCHEMA]
})
export class AppModule {}
```

- Build as web component

```json
// angular.json
{
  "build": {
    "options": {
      "outputPath": "dist",
      "singleBundle": true
    }
  }
}
```

- Use input() and output() for web component data

```ts
@Component({
  selector: 'my-element',
  standalone: true
})
export class MyElementComponent {
  data = input<string>('');
  output = output<string>();

  onClick() {
    this.output.emit('event-data');
  }
}
```

- Handle content projection

```ts
@Component({
  selector: 'my-element',
  template: `
    <div class="header">
      <ng-content select="[header]"></ng-content>
    </div>
    <div class="body">
      <ng-content></ng-content>

From oguzhan18/angular-ecosystem-skills, MIT.

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