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  • import { Attribute, Component } from '@angular/core';
    
    @Component({
      selector: 'app-my-input-with-attribute-decorator',
      template: '<p>The type of the input is: {{ type }}</p>'
    })
    export class MyInputWithAttributeDecoratorComponent {
      constructor(@Attribute('type') public type: string) { }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">interface</span> <span class="token class-name">Attribute</span> <span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">const</span> Attribute<span class="token operator">:</span> AttributeDecorator <span class="token keyword">import</span> Attribute</code><div class="typing-tooltip-markup">Type of the Attribute metadata. Attribute decorator and metadata.<br><br><em>@publicApi</em><br><br><em>@Annotation</em><br><br><em>@publicApi</em></div></pre>
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  • import { Component } from '@angular/core';
    
    @Component({
      selector: 'app-cart',
      templateUrl: './cart.component.html',
      styleUrls: ['./cart.component.css']
    })
    export class CartComponent {
    
      constructor() { }
    
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">interface</span> <span class="token class-name">Component</span> <span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">const</span> Component<span class="token operator">:</span> ComponentDecorator <span class="token keyword">import</span> Component</code><div class="typing-tooltip-markup">Supplies configuration metadata for an Angular component. Component decorator and metadata.<br><br><em>@publicApi</em><br><br><em>@Annotation</em><br><br><em>@publicApi</em></div></pre>
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  • import { Router, NavigationStart } from '@angular/router';
    import { filter } from 'rxjs/operators';
    
    @Component({
      selector: 'app-routable',
      template: 'Routable1Component template'
    })
    export class Routable1Component implements OnInit {
    
      navStart: Observable<NavigationStart>;
    
      constructor(router: Router) {
        // Create a new Observable that publishes only the NavigationStart event
        this.navStart = router.events.pipe(
          filter(evt => evt instanceof NavigationStart)
        ) as Observable<NavigationStart>;
      }
    
      ngOnInit() {
        this.navStart.subscribe(() => console.log('Navigation Started!'));
      }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">class</span> <span class="token class-name">Router</span> <span class="token keyword">import</span> Router</code><div class="typing-tooltip-markup"><em>@description</em> — A service that provides navigation among views and URL manipulation capabilities.<br><br><em>@see</em> — <code>Route</code>.<br><br><em>@see</em> — <a href="guide/router">Routing and Navigation Guide</a>.<br><br><em>@ngModule</em> — RouterModule<br><br><em>@publicApi</em></div></pre>
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  • @Component({
      selector: 'my-component',
      template: '<span *ngIf="person && address"> {{person.name}} lives on {{address.street}} </span>'
    })
    class MyComponent {
      person?: Person;
      address?: Address;
    
      setData(person: Person, address: Address) {
        this.person = person;
        this.address = address;
      }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • @Component({
      selector: 'app-component-overview',
      template: `
        <h1>Hello World!</h1>
        <p>This template definition spans multiple lines.</p>
      `
    })
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • export class HeroComponent {
      @Output() savedTheDay = new EventEmitter<boolean>();
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">class</span> <span class="token class-name">HeroComponent</span></code></pre>
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  • export class ProductAlertsComponent {
      @Input() product: Product | undefined;
      @Output() notify = new EventEmitter();
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">class</span> <span class="token class-name">ProductAlertsComponent</span></code></pre>
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  • @Component({
      selector: 'app-zippy',
      template: `
        <div class="zippy">
          <div (click)="toggle()">Toggle</div>
          <div [hidden]="!visible">
            <ng-content></ng-content>
          </div>
        </div>
      `,
    })
    export class ZippyComponent {
      visible = true;
      @Output() open = new EventEmitter<any>();
      @Output() close = new EventEmitter<any>();
    
      toggle() {
        this.visible = !this.visible;
        if (this.visible) {
          this.open.emit(null);
        } else {
          this.close.emit(null);
        }
      }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • /* avoid */
    
    @Component({
      selector: 'toh-hero',
      template: `...`
    })
    export class HeroComponent {
      @Output() onSavedTheDay = new EventEmitter<boolean>();
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • export class SizerComponent {
    
      @Input()  size!: number | string;
      @Output() sizeChange = new EventEmitter<number>();
    
      dec() { this.resize(-1); }
      inc() { this.resize(+1); }
    
      resize(delta: number) {
        this.size = Math.min(40, Math.max(8, +this.size + delta));
        this.sizeChange.emit(this.size);
      }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">class</span> <span class="token class-name">SizerComponent</span></code></pre>
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  • import { Directive } from '@angular/core';
    
    @Directive({
      selector: '[tohValidator2]',
      host: {
        '[attr.role]': 'role',
        '(mouseenter)': 'onMouseEnter()'
      }
    })
    export class Validator2Directive {
      role = 'button';
      onMouseEnter() {
        // do work
      }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">interface</span> <span class="token class-name">Directive</span> <span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">const</span> Directive<span class="token operator">:</span> DirectiveDecorator <span class="token keyword">import</span> Directive</code><div class="typing-tooltip-markup">Directive decorator and metadata. Type of the Directive metadata.<br><br><em>@Annotation</em><br><br><em>@publicApi</em><br><br><em>@publicApi</em></div></pre>
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  • @Directive({
      selector: '[tohHighlight]'
    })
    export class HighlightDirective {
      @HostListener('mouseover') onMouseEnter() {
        // do highlight work
      }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • @Directive({
      selector: '[tohValidate]'
    })
    export class ValidateDirective {}
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • import { Directive } from '@angular/core';
    
    @Directive({
      selector: '[appItem]'
    })
    export class ItemDirective {
    // code goes here
      constructor() { }
    
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">interface</span> <span class="token class-name">Directive</span> <span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">const</span> Directive<span class="token operator">:</span> DirectiveDecorator <span class="token keyword">import</span> Directive</code><div class="typing-tooltip-markup">Directive decorator and metadata. Type of the Directive metadata.<br><br><em>@Annotation</em><br><br><em>@publicApi</em><br><br><em>@publicApi</em></div></pre>
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  • /* avoid */
    
    @Directive({
      selector: '[validate]'
    })
    export class ValidateDirective {}
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • @Input() items: Item[] = [];
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • @Input() childItem = '';
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • export class ProductAlertsComponent implements OnInit {
    
      @Input() product!: Product;
      constructor() { }
    
      ngOnInit() {
      }
    
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">class</span> <span class="token class-name">ProductAlertsComponent</span></code></pre>
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  • @Directive({
      selector: '[appForbiddenName]',
      providers: [{provide: NG_VALIDATORS, useExisting: ForbiddenValidatorDirective, multi: true}]
    })
    export class ForbiddenValidatorDirective implements Validator {
      @Input('appForbiddenName') forbiddenName = '';
    
      validate(control: AbstractControl): ValidationErrors | null {
        return this.forbiddenName ? forbiddenNameValidator(new RegExp(this.forbiddenName, 'i'))(control)
                                  : null;
      }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • @Component({
      selector: 'app-typical',
      template: '<div>A typical component for {{data.name}}</div>'
    })
    export class TypicalComponent {
      @Input() data: TypicalData;
      constructor(private someService: SomeService) { ... }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • class MyComponent {
      constructor(@Optional() other: OtherComponent) {}
    
      @ContentChild(OtherComponent)
      other: OtherComponent|null;
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">class</span> <span class="token class-name">MyComponent</span></code></pre>
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  • constructor(@Optional() config?: UserServiceConfig) {
      if (config) { this._userName = config.userName; }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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  • constructor(@Optional() @SkipSelf() parentModule?: GreetingModule) {
      if (parentModule) {
        throw new Error(
          'GreetingModule is already loaded. Import it in the AppModule only');
      }
    }
    <pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token builtin">any</span></code></pre>
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