angular2/src/core/metadata.d.ts

Angular 2 - a web framework for modern web apps

/**
 * This indirection is needed to free up Component, etc symbols in the public API
 * to be used by the decorator versions of these annotations.
 */
export { QueryMetadata, ContentChildrenMetadata, ContentChildMetadata, ViewChildrenMetadata, ViewQueryMetadata, ViewChildMetadata, AttributeMetadata } from './metadata/di';
export { ComponentMetadata, DirectiveMetadata, PipeMetadata, InputMetadata, OutputMetadata, HostBindingMetadata, HostListenerMetadata } from './metadata/directives';
export { ViewMetadata, ViewEncapsulation } from './metadata/view';
export { AfterContentInit, AfterContentChecked, AfterViewInit, AfterViewChecked, OnChanges, OnDestroy, OnInit, DoCheck } from './metadata/lifecycle_hooks';
import { QueryMetadata, ContentChildrenMetadata, ViewChildrenMetadata, AttributeMetadata } from './metadata/di';
import { ComponentMetadata, DirectiveMetadata } from './metadata/directives';
import { ViewMetadata, ViewEncapsulation } from './metadata/view';
import { ChangeDetectionStrategy } from 'angular2/src/core/change_detection/change_detection';
import { TypeDecorator } from './util/decorators';
import { Type } from 'angular2/src/facade/lang';
/**
 * Interface for the {@link DirectiveMetadata} decorator function.
 *
 * See {@link DirectiveFactory}.
 */
export interface DirectiveDecorator extends TypeDecorator {
}
/**
 * Interface for the {@link ComponentMetadata} decorator function.
 *
 * See {@link ComponentFactory}.
 */
export interface ComponentDecorator extends TypeDecorator {
    /**
     * Chain {@link ViewMetadata} annotation.
     */
    View(obj: {
        templateUrl?: string;
        template?: string;
        directives?: Array<Type | any[]>;
        pipes?: Array<Type | any[]>;
        renderer?: string;
        styles?: string[];
        styleUrls?: string[];
    }): ViewDecorator;
}
/**
 * Interface for the {@link ViewMetadata} decorator function.
 *
 * See {@link ViewFactory}.
 */
export interface ViewDecorator extends TypeDecorator {
    /**
     * Chain {@link ViewMetadata} annotation.
     */
    View(obj: {
        templateUrl?: string;
        template?: string;
        directives?: Array<Type | any[]>;
        pipes?: Array<Type | any[]>;
        renderer?: string;
        styles?: string[];
        styleUrls?: string[];
    }): ViewDecorator;
}
/**
 * {@link DirectiveMetadata} factory for creating annotations, decorators or DSL.
 *
 * ### Example as TypeScript Decorator
 *
 * {@example core/ts/metadata/metadata.ts region='directive'}
 *
 * ### Example as ES5 DSL
 *
 * ```
 * var MyDirective = ng
 *   .Directive({...})
 *   .Class({
 *     constructor: function() {
 *       ...
 *     }
 *   })
 * ```
 *
 * ### Example as ES5 annotation
 *
 * ```
 * var MyDirective = function() {
 *   ...
 * };
 *
 * MyDirective.annotations = [
 *   new ng.Directive({...})
 * ]
 * ```
 */
export interface DirectiveMetadataFactory {
    (obj: {
        selector?: string;
        inputs?: string[];
        outputs?: string[];
        properties?: string[];
        events?: string[];
        host?: {
            [key: string]: string;
        };
        bindings?: any[];
        providers?: any[];
        exportAs?: string;
        queries?: {
            [key: string]: any;
        };
    }): DirectiveDecorator;
    new (obj: {
        selector?: string;
        inputs?: string[];
        outputs?: string[];
        properties?: string[];
        events?: string[];
        host?: {
            [key: string]: string;
        };
        bindings?: any[];
        providers?: any[];
        exportAs?: string;
        queries?: {
            [key: string]: any;
        };
    }): DirectiveMetadata;
}
/**
 * {@link ComponentMetadata} factory for creating annotations, decorators or DSL.
 *
 * ### Example as TypeScript Decorator
 *
 * {@example core/ts/metadata/metadata.ts region='component'}
 *
 * ### Example as ES5 DSL
 *
 * ```
 * var MyComponent = ng
 *   .Component({...})
 *   .Class({
 *     constructor: function() {
 *       ...
 *     }
 *   })
 * ```
 *
 * ### Example as ES5 annotation
 *
 * ```
 * var MyComponent = function() {
 *   ...
 * };
 *
 * MyComponent.annotations = [
 *   new ng.Component({...})
 * ]
 * ```
 */
export interface ComponentMetadataFactory {
    (obj: {
        selector?: string;
        inputs?: string[];
        outputs?: string[];
        properties?: string[];
        events?: string[];
        host?: {
            [key: string]: string;
        };
        bindings?: any[];
        providers?: any[];
        exportAs?: string;
        moduleId?: string;
        queries?: {
            [key: string]: any;
        };
        viewBindings?: any[];
        viewProviders?: any[];
        changeDetection?: ChangeDetectionStrategy;
        templateUrl?: string;
        template?: string;
        styleUrls?: string[];
        styles?: string[];
        directives?: Array<Type | any[]>;
        pipes?: Array<Type | any[]>;
        encapsulation?: ViewEncapsulation;
    }): ComponentDecorator;
    new (obj: {
        selector?: string;
        inputs?: string[];
        outputs?: string[];
        properties?: string[];
        events?: string[];
        host?: {
            [key: string]: string;
        };
        bindings?: any[];
        providers?: any[];
        exportAs?: string;
        moduleId?: string;
        queries?: {
            [key: string]: any;
        };
        viewBindings?: any[];
        viewProviders?: any[];
        changeDetection?: ChangeDetectionStrategy;
        templateUrl?: string;
        template?: string;
        styleUrls?: string[];
        styles?: string[];
        directives?: Array<Type | any[]>;
        pipes?: Array<Type | any[]>;
        encapsulation?: ViewEncapsulation;
    }): ComponentMetadata;
}
/**
 * {@link ViewMetadata} factory for creating annotations, decorators or DSL.
 *
 * ### Example as TypeScript Decorator
 *
 * ```
 * import {Component, View} from "angular2/core";
 *
 * @Component({...})
 * class MyComponent {
 *   constructor() {
 *     ...
 *   }
 * }
 * ```
 *
 * ### Example as ES5 DSL
 *
 * ```
 * var MyComponent = ng
 *   .Component({...})
 *   .View({...})
 *   .Class({
 *     constructor: function() {
 *       ...
 *     }
 *   })
 * ```
 *
 * ### Example as ES5 annotation
 *
 * ```
 * var MyComponent = function() {
 *   ...
 * };
 *
 * MyComponent.annotations = [
 *   new ng.Component({...}),
 *   new ng.View({...})
 * ]
 * ```
 */
export interface ViewMetadataFactory {
    (obj: {
        templateUrl?: string;
        template?: string;
        directives?: Array<Type | any[]>;
        pipes?: Array<Type | any[]>;
        encapsulation?: ViewEncapsulation;
        styles?: string[];
        styleUrls?: string[];
    }): ViewDecorator;
    new (obj: {
        templateUrl?: string;
        template?: string;
        directives?: Array<Type | any[]>;
        pipes?: Array<Type | any[]>;
        encapsulation?: ViewEncapsulation;
        styles?: string[];
        styleUrls?: string[];
    }): ViewMetadata;
}
/**
 * {@link AttributeMetadata} factory for creating annotations, decorators or DSL.
 *
 * ### Example as TypeScript Decorator
 *
 * {@example core/ts/metadata/metadata.ts region='attributeFactory'}
 *
 * ### Example as ES5 DSL
 *
 * ```
 * var MyComponent = ng
 *   .Component({...})
 *   .Class({
 *     constructor: [new ng.Attribute('title'), function(title) {
 *       ...
 *     }]
 *   })
 * ```
 *
 * ### Example as ES5 annotation
 *
 * ```
 * var MyComponent = function(title) {
 *   ...
 * };
 *
 * MyComponent.annotations = [
 *   new ng.Component({...})
 * ]
 * MyComponent.parameters = [
 *   [new ng.Attribute('title')]
 * ]
 * ```
 */
export interface AttributeMetadataFactory {
    (name: string): TypeDecorator;
    new (name: string): AttributeMetadata;
}
/**
 * {@link QueryMetadata} factory for creating annotations, decorators or DSL.
 *
 * ### Example as TypeScript Decorator
 *
 * ```
 * import {Query, QueryList, Component} from "angular2/core";
 *
 * @Component({...})
 * class MyComponent {
 *   constructor(@Query(SomeType) queryList: QueryList<SomeType>) {
 *     ...
 *   }
 * }
 * ```
 *
 * ### Example as ES5 DSL
 *
 * ```
 * var MyComponent = ng
 *   .Component({...})
 *   .Class({
 *     constructor: [new ng.Query(SomeType), function(queryList) {
 *       ...
 *     }]
 *   })
 * ```
 *
 * ### Example as ES5 annotation
 *
 * ```
 * var MyComponent = function(queryList) {
 *   ...
 * };
 *
 * MyComponent.annotations = [
 *   new ng.Component({...})
 * ]
 * MyComponent.parameters = [
 *   [new ng.Query(SomeType)]
 * ]
 * ```
 */
export interface QueryMetadataFactory {
    (selector: Type | string, {descendants, read}?: {
        descendants?: boolean;
        read?: any;
    }): ParameterDecorator;
    new (selector: Type | string, {descendants, read}?: {
        descendants?: boolean;
        read?: any;
    }): QueryMetadata;
}
/**
 * Factory for {@link ContentChildren}.
 */
export interface ContentChildrenMetadataFactory {
    (selector: Type | string, {descendants, read}?: {
        descendants?: boolean;
        read?: any;
    }): any;
    new (selector: Type | string, {descendants, read}?: {
        descendants?: boolean;
        read?: any;
    }): ContentChildrenMetadata;
}
/**
 * Factory for {@link ContentChild}.
 */
export interface ContentChildMetadataFactory {
    (selector: Type | string, {read}?: {
        read?: any;
    }): any;
    new (selector: Type | string, {read}?: {
        read?: any;
    }): ContentChildMetadataFactory;
}
/**
 * Factory for {@link ViewChildren}.
 */
export interface ViewChildrenMetadataFactory {
    (selector: Type | string, {read}?: {
        read?: any;
    }): any;
    new (selector: Type | string, {read}?: {
        read?: any;
    }): ViewChildrenMetadata;
}
/**
 * Factory for {@link ViewChild}.
 */
export interface ViewChildMetadataFactory {
    (selector: Type | string, {read}?: {
        read?: any;
    }): any;
    new (selector: Type | string, {read}?: {
        read?: any;
    }): ViewChildMetadataFactory;
}
/**
 * {@link PipeMetadata} factory for creating decorators.
 *
 * ### Example
 *
 * {@example core/ts/metadata/metadata.ts region='pipe'}
 */
export interface PipeMetadataFactory {
    (obj: {
        name: string;
        pure?: boolean;
    }): any;
    new (obj: {
        name: string;
        pure?: boolean;
    }): any;
}
/**
 * {@link InputMetadata} factory for creating decorators.
 *
 * See {@link InputMetadata}.
 */
export interface InputMetadataFactory {
    (bindingPropertyName?: string): any;
    new (bindingPropertyName?: string): any;
}
/**
 * {@link OutputMetadata} factory for creating decorators.
 *
 * See {@link OutputMetadata}.
 */
export interface OutputMetadataFactory {
    (bindingPropertyName?: string): any;
    new (bindingPropertyName?: string): any;
}
/**
 * {@link HostBindingMetadata} factory function.
 */
export interface HostBindingMetadataFactory {
    (hostPropertyName?: string): any;
    new (hostPropertyName?: string): any;
}
/**
 * {@link HostListenerMetadata} factory function.
 */
export interface HostListenerMetadataFactory {
    (eventName: string, args?: string[]): any;
    new (eventName: string, args?: string[]): any;
}
/**
 * Declare reusable UI building blocks for an application.
 *
 * Each Angular component requires a single `@Component` annotation. The `@Component`
 * annotation specifies when a component is instantiated, and which properties and hostListeners it
 * binds to.
 *
 * When a component is instantiated, Angular
 * - creates a shadow DOM for the component.
 * - loads the selected template into the shadow DOM.
 * - creates all the injectable objects configured with `providers` and `viewProviders`.
 *
 * All template expressions and statements are then evaluated against the component instance.
 *
 * ## Lifecycle hooks
 *
 * When the component class implements some {@link ../../guide/lifecycle-hooks.html} the callbacks
 * are called by the change detection at defined points in time during the life of the component.
 *
 * ### Example
 *
 * {@example core/ts/metadata/metadata.ts region='component'}
 */
export declare var Component: ComponentMetadataFactory;
/**
 * Directives allow you to attach behavior to elements in the DOM.
 *
 * {@link DirectiveMetadata}s with an embedded view are called {@link ComponentMetadata}s.
 *
 * A directive consists of a single directive annotation and a controller class. When the
 * directive's `selector` matches
 * elements in the DOM, the following steps occur:
 *
 * 1. For each directive, the `ElementInjector` attempts to resolve the directive's constructor
 * arguments.
 * 2. Angular instantiates directives for each matched element using `ElementInjector` in a
 * depth-first order,
 *    as declared in the HTML.
 *
 * ## Understanding How Injection Works
 *
 * There are three stages of injection resolution.
 * - *Pre-existing Injectors*:
 *   - The terminal {@link Injector} cannot resolve dependencies. It either throws an error or, if
 * the dependency was
 *     specified as `@Optional`, returns `null`.
 *   - The platform injector resolves browser singleton resources, such as: cookies, title,
 * location, and others.
 * - *Component Injectors*: Each component instance has its own {@link Injector}, and they follow
 * the same parent-child hierarchy
 *     as the component instances in the DOM.
 * - *Element Injectors*: Each component instance has a Shadow DOM. Within the Shadow DOM each
 * element has an `ElementInjector`
 *     which follow the same parent-child hierarchy as the DOM elements themselves.
 *
 * When a template is instantiated, it also must instantiate the corresponding directives in a
 * depth-first order. The
 * current `ElementInjector` resolves the constructor dependencies for each directive.
 *
 * Angular then resolves dependencies as follows, according to the order in which they appear in the
 * {@link ViewMetadata}:
 *
 * 1. Dependencies on the current element
 * 2. Dependencies on element injectors and their parents until it encounters a Shadow DOM boundary
 * 3. Dependencies on component injectors and their parents until it encounters the root component
 * 4. Dependencies on pre-existing injectors
 *
 *
 * The `ElementInjector` can inject other directives, element-specific special objects, or it can
 * delegate to the parent
 * injector.
 *
 * To inject other directives, declare the constructor parameter as:
 * - `directive:DirectiveType`: a directive on the current element only
 * - `@Host() directive:DirectiveType`: any directive that matches the type between the current
 * element and the
 *    Shadow DOM root.
 * - `@Query(DirectiveType) query:QueryList<DirectiveType>`: A live collection of direct child
 * directives.
 * - `@QueryDescendants(DirectiveType) query:QueryList<DirectiveType>`: A live collection of any
 * child directives.
 *
 * To inject element-specific special objects, declare the constructor parameter as:
 * - `element: ElementRef` to obtain a reference to logical element in the view.
 * - `viewContainer: ViewContainerRef` to control child template instantiation, for
 * {@link DirectiveMetadata} directives only
 * - `bindingPropagation: BindingPropagation` to control change detection in a more granular way.
 *
 * ### Example
 *
 * The following example demonstrates how dependency injection resolves constructor arguments in
 * practice.
 *
 *
 * Assume this HTML template:
 *
 * ```
 * <div dependency="1">
 *   <div dependency="2">
 *     <div dependency="3" my-directive>
 *       <div dependency="4">
 *         <div dependency="5"></div>
 *       </div>
 *       <div dependency="6"></div>
 *     </div>
 *   </div>
 * </div>
 * ```
 *
 * With the following `dependency` decorator and `SomeService` injectable class.
 *
 * ```
 * @Injectable()
 * class SomeService {
 * }
 *
 * @Directive({
 *   selector: '[dependency]',
 *   inputs: [
 *     'id: dependency'
 *   ]
 * })
 * class Dependency {
 *   id:string;
 * }
 * ```
 *
 * Let's step through the different ways in which `MyDirective` could be declared...
 *
 *
 * ### No injection
 *
 * Here the constructor is declared with no arguments, therefore nothing is injected into
 * `MyDirective`.
 *
 * ```
 * @Directive({ selector: '[my-directive]' })
 * class MyDirective {
 *   constructor() {
 *   }
 * }
 * ```
 *
 * This directive would be instantiated with no dependencies.
 *
 *
 * ### Component-level injection
 *
 * Directives can inject any injectable instance from the closest component injector or any of its
 * parents.
 *
 * Here, the constructor declares a parameter, `someService`, and injects the `SomeService` type
 * from the parent
 * component's injector.
 * ```
 * @Directive({ selector: '[my-directive]' })
 * class MyDirective {
 *   constructor(someService: SomeService) {
 *   }
 * }
 * ```
 *
 * This directive would be instantiated with a dependency on `SomeService`.
 *
 *
 * ### Injecting a directive from the current element
 *
 * Directives can inject other directives declared on the current element.
 *
 * ```
 * @Directive({ selector: '[my-directive]' })
 * class MyDirective {
 *   constructor(dependency: Dependency) {
 *     expect(dependency.id).toEqual(3);
 *   }
 * }
 * ```
 * This directive would be instantiated with `Dependency` declared at the same element, in this case
 * `dependency="3"`.
 *
 * ### Injecting a directive from any ancestor elements
 *
 * Directives can inject other directives declared on any ancestor element (in the current Shadow
 * DOM), i.e. on the current element, the
 * parent element, or its parents.
 * ```
 * @Directive({ selector: '[my-directive]' })
 * class MyDirective {
 *   constructor(@Host() dependency: Dependency) {
 *     expect(dependency.id).toEqual(2);
 *   }
 * }
 * ```
 *
 * `@Host` checks the current element, the parent, as well as its parents recursively. If
 * `dependency="2"` didn't
 * exist on the direct parent, this injection would
 * have returned
 * `dependency="1"`.
 *
 *
 * ### Injecting a live collection of direct child directives
 *
 *
 * A directive can also query for other child directives. Since parent directives are instantiated
 * before child directives, a directive can't simply inject the list of child directives. Instead,
 * the directive injects a {@link QueryList}, which updates its contents as children are added,
 * removed, or moved by a directive that uses a {@link ViewContainerRef} such as a `ngFor`, an
 * `ngIf`, or an `ngSwitch`.
 *
 * ```
 * @Directive({ selector: '[my-directive]' })
 * class MyDirective {
 *   constructor(@Query(Dependency) dependencies:QueryList<Dependency>) {
 *   }
 * }
 * ```
 *
 * This directive would be instantiated with a {@link QueryList} which contains `Dependency` 4 and
 * 6. Here, `Dependency` 5 would not be included, because it is not a direct child.
 *
 * ### Injecting a live collection of descendant directives
 *
 * By passing the descendant flag to `@Query` above, we can include the children of the child
 * elements.
 *
 * ```
 * @Directive({ selector: '[my-directive]' })
 * class MyDirective {
 *   constructor(@Query(Dependency, {descendants: true}) dependencies:QueryList<Dependency>) {
 *   }
 * }
 * ```
 *
 * This directive would be instantiated with a Query which would contain `Dependency` 4, 5 and 6.
 *
 * ### Optional injection
 *
 * The normal behavior of directives is to return an error when a specified dependency cannot be
 * resolved. If you
 * would like to inject `null` on unresolved dependency instead, you can annotate that dependency
 * with `@Optional()`.
 * This explicitly permits the author of a template to treat some of the surrounding directives as
 * optional.
 *
 * ```
 * @Directive({ selector: '[my-directive]' })
 * class MyDirective {
 *   constructor(@Optional() dependency:Dependency) {
 *   }
 * }
 * ```
 *
 * This directive would be instantiated with a `Dependency` directive found on the current element.
 * If none can be
 * found, the injector supplies `null` instead of throwing an error.
 *
 * ### Example
 *
 * Here we use a decorator directive to simply define basic tool-tip behavior.
 *
 * ```
 * @Directive({
 *   selector: '[tooltip]',
 *   inputs: [
 *     'text: tooltip'
 *   ],
 *   host: {
 *     '(mouseenter)': 'onMouseEnter()',
 *     '(mouseleave)': 'onMouseLeave()'
 *   }
 * })
 * class Tooltip{
 *   text:string;
 *   overlay:Overlay; // NOT YET IMPLEMENTED
 *   overlayManager:OverlayManager; // NOT YET IMPLEMENTED
 *
 *   constructor(overlayManager:OverlayManager) {
 *     this.overlay = overlay;
 *   }
 *
 *   onMouseEnter() {
 *     // exact signature to be determined
 *     this.overlay = this.overlayManager.open(text, ...);
 *   }
 *
 *   onMouseLeave() {
 *     this.overlay.close();
 *     this.overlay = null;
 *   }
 * }
 * ```
 * In our HTML template, we can then add this behavior to a `<div>` or any other element with the
 * `tooltip` selector,
 * like so:
 *
 * ```
 * <div tooltip="some text here"></div>
 * ```
 *
 * Directives can also control the instantiation, destruction, and positioning of inline template
 * elements:
 *
 * A directive uses a {@link ViewContainerRef} to instantiate, insert, move, and destroy views at
 * runtime.
 * The {@link ViewContainerRef} is created as a result of `<template>` element, and represents a
 * location in the current view
 * where these actions are performed.
 *
 * Views are always created as children of the current {@link ViewMetadata}, and as siblings of the
 * `<template>` element. Thus a
 * directive in a child view cannot inject the directive that created it.
 *
 * Since directives that create views via ViewContainers are common in Angular, and using the full
 * `<template>` element syntax is wordy, Angular
 * also supports a shorthand notation: `<li *foo="bar">` and `<li template="foo: bar">` are
 * equivalent.
 *
 * Thus,
 *
 * ```
 * <ul>
 *   <li *foo="bar" title="text"></li>
 * </ul>
 * ```
 *
 * Expands in use to:
 *
 * ```
 * <ul>
 *   <template [foo]="bar">
 *     <li title="text"></li>
 *   </template>
 * </ul>
 * ```
 *
 * Notice that although the shorthand places `*foo="bar"` within the `<li>` element, the binding for
 * the directive
 * controller is correctly instantiated on the `<template>` element rather than the `<li>` element.
 *
 * ## Lifecycle hooks
 *
 * When the directive class implements some {@link ../../guide/lifecycle-hooks.html} the callbacks
 * are called by the change detection at defined points in time during the life of the directive.
 *
 * ### Example
 *
 * Let's suppose we want to implement the `unless` behavior, to conditionally include a template.
 *
 * Here is a simple directive that triggers on an `unless` selector:
 *
 * ```
 * @Directive({
 *   selector: '[unless]',
 *   inputs: ['unless']
 * })
 * export class Unless {
 *   viewContainer: ViewContainerRef;
 *   templateRef: TemplateRef;
 *   prevCondition: boolean;
 *
 *   constructor(viewContainer: ViewContainerRef, templateRef: TemplateRef) {
 *     this.viewContainer = viewContainer;
 *     this.templateRef = templateRef;
 *     this.prevCondition = null;
 *   }
 *
 *   set unless(newCondition) {
 *     if (newCondition && (isBlank(this.prevCondition) || !this.prevCondition)) {
 *       this.prevCondition = true;
 *       this.viewContainer.clear();
 *     } else if (!newCondition && (isBlank(this.prevCondition) || this.prevCondition)) {
 *       this.prevCondition = false;
 *       this.viewContainer.create(this.templateRef);
 *     }
 *   }
 * }
 * ```
 *
 * We can then use this `unless` selector in a template:
 * ```
 * <ul>
 *   <li *unless="expr"></li>
 * </ul>
 * ```
 *
 * Once the directive instantiates the child view, the shorthand notation for the template expands
 * and the result is:
 *
 * ```
 * <ul>
 *   <template [unless]="exp">
 *     <li></li>
 *   </template>
 *   <li></li>
 * </ul>
 * ```
 *
 * Note also that although the `<li></li>` template still exists inside the `<template></template>`,
 * the instantiated
 * view occurs on the second `<li></li>` which is a sibling to the `<template>` element.
 */
export declare var Directive: DirectiveMetadataFactory;
/**
 * Specifies that a constant attribute value should be injected.
 *
 * The directive can inject constant string literals of host element attributes.
 *
 * ### Example
 *
 * Suppose we have an `<input>` element and want to know its `type`.
 *
 * ```html
 * <input type="text">
 * ```
 *
 * A decorator can inject string literal `text` like so:
 *
 * {@example core/ts/metadata/metadata.ts region='attributeMetadata'}
 */
export declare var Attribute: AttributeMetadataFactory;
/**
 * Declares an injectable parameter to be a live list of directives or variable
 * bindings from the content children of a directive.
 *
 * ### Example ([live demo](http://plnkr.co/edit/lY9m8HLy7z06vDoUaSN2?p=preview))
 *
 * Assume that `<tabs>` component would like to get a list its children `<pane>`
 * components as shown in this example:
 *
 * ```html
 * <tabs>
 *   <pane title="Overview">...</pane>
 *   <pane *ngFor="let o of objects" [title]="o.title">{{o.text}}</pane>
 * </tabs>
 * ```
 *
 * The preferred solution is to query for `Pane` directives using this decorator.
 *
 * ```javascript
 * @Component({
 *   selector: 'pane',
 *   inputs: ['title']
 * })
 * class Pane {
 *   title:string;
 * }
 *
 * @Component({
 *  selector: 'tabs',
 *  template: `
 *    <ul>
 *      <li *ngFor="let pane of panes">{{pane.title}}</li>
 *    </ul>
 *    <ng-content></ng-content>
 *  `
 * })
 * class Tabs {
 *   panes: QueryList<Pane>;
 *   constructor(@Query(Pane) panes:QueryList<Pane>) {
 *     this.panes = panes;
 *   }
 * }
 * ```
 *
 * A query can look for variable bindings by passing in a string with desired binding symbol.
 *
 * ### Example ([live demo](http://plnkr.co/edit/sT2j25cH1dURAyBRCKx1?p=preview))
 * ```html
 * <seeker>
 *   <div #findme>...</div>
 * </seeker>
 *
 * @Component({ selector: 'seeker' })
 * class seeker {
 *   constructor(@Query('findme') elList: QueryList<ElementRef>) {...}
 * }
 * ```
 *
 * In this case the object that is injected depend on the type of the variable
 * binding. It can be an ElementRef, a directive or a component.
 *
 * Passing in a comma separated list of variable bindings will query for all of them.
 *
 * ```html
 * <seeker>
 *   <div #findMe>...</div>
 *   <div #findMeToo>...</div>
 * </seeker>
 *
 *  @Component({
 *   selector: 'seeker'
 * })
 * class Seeker {
 *   constructor(@Query('findMe, findMeToo') elList: QueryList<ElementRef>) {...}
 * }
 * ```
 *
 * Configure whether query looks for direct children or all descendants
 * of the querying element, by using the `descendants` parameter.
 * It is set to `false` by default.
 *
 * ### Example ([live demo](http://plnkr.co/edit/wtGeB977bv7qvA5FTYl9?p=preview))
 * ```html
 * <container #first>
 *   <item>a</item>
 *   <item>b</item>
 *   <container #second>
 *     <item>c</item>
 *   </container>
 * </container>
 * ```
 *
 * When querying for items, the first container will see only `a` and `b` by default,
 * but with `Query(TextDirective, {descendants: true})` it will see `c` too.
 *
 * The queried directives are kept in a depth-first pre-order with respect to their
 * positions in the DOM.
 *
 * Query does not look deep into any subcomponent views.
 *
 * Query is updated as part of the change-detection cycle. Since change detection
 * happens after construction of a directive, QueryList will always be empty when observed in the
 * constructor.
 *
 * The injected object is an unmodifiable live list.
 * See {@link QueryList} for more details.
 */
export declare var Query: QueryMetadataFactory;
/**
 * Configures a content query.
 *
 * Content queries are set before the `ngAfterContentInit` callback is called.
 *
 * ### Example
 *
 * ```
 * @Directive({
 *   selector: 'someDir'
 * })
 * class SomeDir {
 *   @ContentChildren(ChildDirective) contentChildren: QueryList<ChildDirective>;
 *
 *   ngAfterContentInit() {
 *     // contentChildren is set
 *   }
 * }
 * ```
 */
export declare var ContentChildren: ContentChildrenMetadataFactory;
/**
 * Configures a content query.
 *
 * Content queries are set before the `ngAfterContentInit` callback is called.
 *
 * ### Example
 *
 * ```
 * @Directive({
 *   selector: 'someDir'
 * })
 * class SomeDir {
 *   @ContentChild(ChildDirective) contentChild;
 *
 *   ngAfterContentInit() {
 *     // contentChild is set
 *   }
 * }
 * ```
 */
export declare var ContentChild: ContentChildMetadataFactory;
/**
 * Declares a list of child element references.
 *
 * Angular automatically updates the list when the DOM is updated.
 *
 * `ViewChildren` takes a argument to select elements.
 *
 * - If the argument is a type, directives or components with the type will be bound.
 *
 * - If the argument is a string, the string is interpreted as a list of comma-separated selectors.
 * For each selector, an element containing the matching template variable (e.g. `#child`) will be
 * bound.
 *
 * View children are set before the `ngAfterViewInit` callback is called.
 *
 * ### Example
 *
 * With type selector:
 *
 * ```
 * @Component({
 *   selector: 'child-cmp',
 *   template: '<p>child</p>'
 * })
 * class ChildCmp {
 *   doSomething() {}
 * }
 *
 * @Component({
 *   selector: 'some-cmp',
 *   template: `
 *     <child-cmp></child-cmp>
 *     <child-cmp></child-cmp>
 *     <child-cmp></child-cmp>
 *   `,
 *   directives: [ChildCmp]
 * })
 * class SomeCmp {
 *   @ViewChildren(ChildCmp) children:QueryList<ChildCmp>;
 *
 *   ngAfterViewInit() {
 *     // children are set
 *     this.children.toArray().forEach((child)=>child.doSomething());
 *   }
 * }
 * ```
 *
 * With string selector:
 *
 * ```
 * @Component({
 *   selector: 'child-cmp',
 *   template: '<p>child</p>'
 * })
 * class ChildCmp {
 *   doSomething() {}
 * }
 *
 * @Component({
 *   selector: 'some-cmp',
 *   template: `
 *     <child-cmp #child1></child-cmp>
 *     <child-cmp #child2></child-cmp>
 *     <child-cmp #child3></child-cmp>
 *   `,
 *   directives: [ChildCmp]
 * })
 * class SomeCmp {
 *   @ViewChildren('child1,child2,child3') children:QueryList<ChildCmp>;
 *
 *   ngAfterViewInit() {
 *     // children are set
 *     this.children.toArray().forEach((child)=>child.doSomething());
 *   }
 * }
 * ```
 *
 * See also: [ViewChildrenMetadata]
 */
export declare var ViewChildren: ViewChildrenMetadataFactory;
/**
 * Declares a reference to a child element.
 *
 * `ViewChildren` takes a argument to select elements.
 *
 * - If the argument is a type, a directive or a component with the type will be bound.
 *
 * - If the argument is a string, the string is interpreted as a selector. An element containing the
 * matching template variable (e.g. `#child`) will be bound.
 *
 * In either case, `@ViewChild()` assigns the first (looking from above) element if there are
 * multiple matches.
 *
 * View child is set before the `ngAfterViewInit` callback is called.
 *
 * ### Example
 *
 * With type selector:
 *
 * ```
 * @Component({
 *   selector: 'child-cmp',
 *   template: '<p>child</p>'
 * })
 * class ChildCmp {
 *   doSomething() {}
 * }
 *
 * @Component({
 *   selector: 'some-cmp',
 *   template: '<child-cmp></child-cmp>',
 *   directives: [ChildCmp]
 * })
 * class SomeCmp {
 *   @ViewChild(ChildCmp) child:ChildCmp;
 *
 *   ngAfterViewInit() {
 *     // child is set
 *     this.child.doSomething();
 *   }
 * }
 * ```
 *
 * With string selector:
 *
 * ```
 * @Component({
 *   selector: 'child-cmp',
 *   template: '<p>child</p>'
 * })
 * class ChildCmp {
 *   doSomething() {}
 * }
 *
 * @Component({
 *   selector: 'some-cmp',
 *   template: '<child-cmp #child></child-cmp>',
 *   directives: [ChildCmp]
 * })
 * class SomeCmp {
 *   @ViewChild('child') child:ChildCmp;
 *
 *   ngAfterViewInit() {
 *     // child is set
 *     this.child.doSomething();
 *   }
 * }
 * ```
 * See also: [ViewChildMetadata]
 */
export declare var ViewChild: ViewChildMetadataFactory;
/**
 * Similar to {@link QueryMetadata}, but querying the component view, instead of
 * the content children.
 *
 * ### Example ([live demo](http://plnkr.co/edit/eNsFHDf7YjyM6IzKxM1j?p=preview))
 *
 * ```javascript
 * @Component({
 *   ...,
 *   template: `
 *     <item> a </item>
 *     <item> b </item>
 *     <item> c </item>
 *   `
 * })
 * class MyComponent {
 *   shown: boolean;
 *
 *   constructor(private @Query(Item) items:QueryList<Item>) {
 *     items.changes.subscribe(() => console.log(items.length));
 *   }
 * }
 * ```
 *
 * Supports the same querying parameters as {@link QueryMetadata}, except
 * `descendants`. This always queries the whole view.
 *
 * As `shown` is flipped between true and false, items will contain zero of one
 * items.
 *
 * Specifies that a {@link QueryList} should be injected.
 *
 * The injected object is an iterable and observable live list.
 * See {@link QueryList} for more details.
 */
export declare var ViewQuery: QueryMetadataFactory;
/**
 * Declare reusable pipe function.
 *
 * ### Example
 *
 * {@example core/ts/metadata/metadata.ts region='pipe'}
 */
export declare var Pipe: PipeMetadataFactory;
/**
 * Declares a data-bound input property.
 *
 * Angular automatically updates data-bound properties during change detection.
 *
 * `InputMetadata` takes an optional parameter that specifies the name
 * used when instantiating a component in the template. When not provided,
 * the name of the decorated property is used.
 *
 * ### Example
 *
 * The following example creates a component with two input properties.
 *
 * ```typescript
 * @Component({
 *   selector: 'bank-account',
 *   template: `
 *     Bank Name: {{bankName}}
 *     Account Id: {{id}}
 *   `
 * })
 * class BankAccount {
 *   @Input() bankName: string;
 *   @Input('account-id') id: string;
 *
 *   // this property is not bound, and won't be automatically updated by Angular
 *   normalizedBankName: string;
 * }
 *
 * @Component({
 *   selector: 'app',
 *   template: `
 *     <bank-account bank-name="RBC" account-id="4747"></bank-account>
 *   `,
 *   directives: [BankAccount]
 * })
 * class App {}
 *
 * bootstrap(App);
 * ```
 */
export declare var Input: InputMetadataFactory;
/**
 * Declares an event-bound output property.
 *
 * When an output property emits an event, an event handler attached to that event
 * the template is invoked.
 *
 * `OutputMetadata` takes an optional parameter that specifies the name
 * used when instantiating a component in the template. When not provided,
 * the name of the decorated property is used.
 *
 * ### Example
 *
 * ```typescript
 * @Directive({
 *   selector: 'interval-dir',
 * })
 * class IntervalDir {
 *   @Output() everySecond = new EventEmitter();
 *   @Output('everyFiveSeconds') five5Secs = new EventEmitter();
 *
 *   constructor() {
 *     setInterval(() => this.everySecond.emit("event"), 1000);
 *     setInterval(() => this.five5Secs.emit("event"), 5000);
 *   }
 * }
 *
 * @Component({
 *   selector: 'app',
 *   template: `
 *     <interval-dir (everySecond)="everySecond()" (everyFiveSeconds)="everyFiveSeconds()">
 *     </interval-dir>
 *   `,
 *   directives: [IntervalDir]
 * })
 * class App {
 *   everySecond() { console.log('second'); }
 *   everyFiveSeconds() { console.log('five seconds'); }
 * }
 * bootstrap(App);
 * ```
 */
export declare var Output: OutputMetadataFactory;
/**
 * Declares a host property binding.
 *
 * Angular automatically checks host property bindings during change detection.
 * If a binding changes, it will update the host element of the directive.
 *
 * `HostBindingMetadata` takes an optional parameter that specifies the property
 * name of the host element that will be updated. When not provided,
 * the class property name is used.
 *
 * ### Example
 *
 * The following example creates a directive that sets the `valid` and `invalid` classes
 * on the DOM element that has ngModel directive on it.
 *
 * ```typescript
 * @Directive({selector: '[ngModel]'})
 * class NgModelStatus {
 *   constructor(public control:NgModel) {}
 *   @HostBinding('[class.valid]') get valid { return this.control.valid; }
 *   @HostBinding('[class.invalid]') get invalid { return this.control.invalid; }
 * }
 *
 * @Component({
 *   selector: 'app',
 *   template: `<input [(ngModel)]="prop">`,
 *   directives: [FORM_DIRECTIVES, NgModelStatus]
 * })
 * class App {
 *   prop;
 * }
 *
 * bootstrap(App);
 * ```
 */
export declare var HostBinding: HostBindingMetadataFactory;
/**
 * Declares a host listener.
 *
 * Angular will invoke the decorated method when the host element emits the specified event.
 *
 * If the decorated method returns `false`, then `preventDefault` is applied on the DOM
 * event.
 *
 * ### Example
 *
 * The following example declares a directive that attaches a click listener to the button and
 * counts clicks.
 *
 * ```typescript
 * @Directive({selector: 'button[counting]'})
 * class CountClicks {
 *   numberOfClicks = 0;
 *
 *   @HostListener('click', ['$event.target'])
 *   onClick(btn) {
 *     console.log("button", btn, "number of clicks:", this.numberOfClicks++);
 *   }
 * }
 *
 * @Component({
 *   selector: 'app',
 *   template: `<button counting>Increment</button>`,
 *   directives: [CountClicks]
 * })
 * class App {}
 *
 * bootstrap(App);
 * ```
 */
export declare var HostListener: HostListenerMetadataFactory;