/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
"use strict";
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var constants_1 = require('../change_detection/constants');
var metadata_1 = require('../di/metadata');
var lang_1 = require('../facade/lang');
/**
 * 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
 * `Dependency` 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.
 * @ts2dart_const
 * @stable
 */
var DirectiveMetadata = (function (_super) {
    __extends(DirectiveMetadata, _super);
    function DirectiveMetadata(_a) {
        var _b = _a === void 0 ? {} : _a, selector = _b.selector, inputs = _b.inputs, outputs = _b.outputs, properties = _b.properties, events = _b.events, host = _b.host, providers = _b.providers, exportAs = _b.exportAs, queries = _b.queries;
        _super.call(this);
        this.selector = selector;
        this._inputs = inputs;
        this._properties = properties;
        this._outputs = outputs;
        this._events = events;
        this.host = host;
        this.exportAs = exportAs;
        this.queries = queries;
        this._providers = providers;
    }
    Object.defineProperty(DirectiveMetadata.prototype, "inputs", {
        /**
         * Enumerates the set of data-bound input properties for a directive
         *
         * Angular automatically updates input properties during change detection.
         *
         * The `inputs` property defines a set of `directiveProperty` to `bindingProperty`
         * configuration:
         *
         * - `directiveProperty` specifies the component property where the value is written.
         * - `bindingProperty` specifies the DOM property where the value is read from.
         *
         * When `bindingProperty` is not provided, it is assumed to be equal to `directiveProperty`.
         *
         * ### Example ([live demo](http://plnkr.co/edit/ivhfXY?p=preview))
         *
         * The following example creates a component with two data-bound properties.
         *
         * ```typescript
         * @Component({
         *   selector: 'bank-account',
         *   inputs: ['bankName', 'id: account-id'],
         *   template: `
         *     Bank Name: {{bankName}}
         *     Account Id: {{id}}
         *   `
         * })
         * class BankAccount {
         *   bankName: string;
         *   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);
         * ```
         *
         */
        get: function () {
            return lang_1.isPresent(this._properties) && this._properties.length > 0 ? this._properties :
                this._inputs;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(DirectiveMetadata.prototype, "properties", {
        /**
         * Use `inputs` instead
         *
         * @deprecated
         */
        get: function () { return this.inputs; },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(DirectiveMetadata.prototype, "outputs", {
        /**
         * Enumerates the set of event-bound output properties.
         *
         * When an output property emits an event, an event handler attached to that event
         * the template is invoked.
         *
         * The `outputs` property defines a set of `directiveProperty` to `bindingProperty`
         * configuration:
         *
         * - `directiveProperty` specifies the component property that emits events.
         * - `bindingProperty` specifies the DOM property the event handler is attached to.
         *
         * ### Example ([live demo](http://plnkr.co/edit/d5CNq7?p=preview))
         *
         * ```typescript
         * @Directive({
         *   selector: 'interval-dir',
         *   outputs: ['everySecond', 'five5Secs: everyFiveSeconds']
         * })
         * class IntervalDir {
         *   everySecond = new EventEmitter();
         *   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);
         * ```
         *
         */
        get: function () {
            return lang_1.isPresent(this._events) && this._events.length > 0 ? this._events : this._outputs;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(DirectiveMetadata.prototype, "events", {
        /**
         * Use `outputs` instead
         *
         * @deprecated
         */
        get: function () { return this.outputs; },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(DirectiveMetadata.prototype, "providers", {
        /**
         * Defines the set of injectable objects that are visible to a Directive and its light DOM
         * children.
         *
         * ## Simple Example
         *
         * Here is an example of a class that can be injected:
         *
         * ```
         * class Greeter {
         *    greet(name:string) {
         *      return 'Hello ' + name + '!';
         *    }
         * }
         *
         * @Directive({
         *   selector: 'greet',
         *   providers: [
         *     Greeter
         *   ]
         * })
         * class HelloWorld {
         *   greeter:Greeter;
         *
         *   constructor(greeter:Greeter) {
         *     this.greeter = greeter;
         *   }
         * }
         * ```
         */
        get: function () { return this._providers; },
        enumerable: true,
        configurable: true
    });
    return DirectiveMetadata;
}(metadata_1.InjectableMetadata));
exports.DirectiveMetadata = DirectiveMetadata;
/**
 * 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.
 *
 * For details on the `@View` annotation, see {@link ViewMetadata}.
 *
 * ## 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'}
 * @ts2dart_const
 * @stable
 */
var ComponentMetadata = (function (_super) {
    __extends(ComponentMetadata, _super);
    function ComponentMetadata(_a) {
        var _b = _a === void 0 ? {} : _a, selector = _b.selector, inputs = _b.inputs, outputs = _b.outputs, properties = _b.properties, events = _b.events, host = _b.host, exportAs = _b.exportAs, moduleId = _b.moduleId, providers = _b.providers, viewProviders = _b.viewProviders, _c = _b.changeDetection, changeDetection = _c === void 0 ? constants_1.ChangeDetectionStrategy.Default : _c, queries = _b.queries, templateUrl = _b.templateUrl, template = _b.template, styleUrls = _b.styleUrls, styles = _b.styles, animations = _b.animations, directives = _b.directives, pipes = _b.pipes, encapsulation = _b.encapsulation, interpolation = _b.interpolation, precompile = _b.precompile;
        _super.call(this, {
            selector: selector,
            inputs: inputs,
            outputs: outputs,
            properties: properties,
            events: events,
            host: host,
            exportAs: exportAs,
            providers: providers,
            queries: queries
        });
        this.changeDetection = changeDetection;
        this._viewProviders = viewProviders;
        this.templateUrl = templateUrl;
        this.template = template;
        this.styleUrls = styleUrls;
        this.styles = styles;
        this.directives = directives;
        this.pipes = pipes;
        this.encapsulation = encapsulation;
        this.moduleId = moduleId;
        this.animations = animations;
        this.interpolation = interpolation;
        this.precompile = precompile;
    }
    Object.defineProperty(ComponentMetadata.prototype, "viewProviders", {
        /**
         * Defines the set of injectable objects that are visible to its view DOM children.
         *
         * ## Simple Example
         *
         * Here is an example of a class that can be injected:
         *
         * ```
         * class Greeter {
         *    greet(name:string) {
         *      return 'Hello ' + name + '!';
         *    }
         * }
         *
         * @Directive({
         *   selector: 'needs-greeter'
         * })
         * class NeedsGreeter {
         *   greeter:Greeter;
         *
         *   constructor(greeter:Greeter) {
         *     this.greeter = greeter;
         *   }
         * }
         *
         * @Component({
         *   selector: 'greet',
         *   viewProviders: [
         *     Greeter
         *   ],
         *   template: `<needs-greeter></needs-greeter>`,
         *   directives: [NeedsGreeter]
         * })
         * class HelloWorld {
         * }
         *
         * ```
         */
        get: function () { return this._viewProviders; },
        enumerable: true,
        configurable: true
    });
    return ComponentMetadata;
}(DirectiveMetadata));
exports.ComponentMetadata = ComponentMetadata;
/**
 * Declare reusable pipe function.
 *
 * A "pure" pipe is only re-evaluated when either the input or any of the arguments change.
 *
 * When not specified, pipes default to being pure.
 *
 * ### Example
 *
 * {@example core/ts/metadata/metadata.ts region='pipe'}
 * @ts2dart_const
 * @stable
 */
var PipeMetadata = (function (_super) {
    __extends(PipeMetadata, _super);
    function PipeMetadata(_a) {
        var name = _a.name, pure = _a.pure;
        _super.call(this);
        this.name = name;
        this._pure = pure;
    }
    Object.defineProperty(PipeMetadata.prototype, "pure", {
        get: function () { return lang_1.isPresent(this._pure) ? this._pure : true; },
        enumerable: true,
        configurable: true
    });
    return PipeMetadata;
}(metadata_1.InjectableMetadata));
exports.PipeMetadata = PipeMetadata;
/**
 * 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);
 * ```
 * @ts2dart_const
 * @stable
 */
var InputMetadata = (function () {
    function InputMetadata(
        /**
         * Name used when instantiating a component in the template.
         */
        bindingPropertyName) {
        this.bindingPropertyName = bindingPropertyName;
    }
    return InputMetadata;
}());
exports.InputMetadata = InputMetadata;
/**
 * 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);
 * ```
 * @ts2dart_const
 * @stable
 */
var OutputMetadata = (function () {
    function OutputMetadata(bindingPropertyName) {
        this.bindingPropertyName = bindingPropertyName;
    }
    return OutputMetadata;
}());
exports.OutputMetadata = OutputMetadata;
/**
 * 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);
 * ```
 * @ts2dart_const
 * @stable
 */
var HostBindingMetadata = (function () {
    function HostBindingMetadata(hostPropertyName) {
        this.hostPropertyName = hostPropertyName;
    }
    return HostBindingMetadata;
}());
exports.HostBindingMetadata = HostBindingMetadata;
/**
 * 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);
 * ```
 * @ts2dart_const
 * @stable
 */
var HostListenerMetadata = (function () {
    function HostListenerMetadata(eventName, args) {
        this.eventName = eventName;
        this.args = args;
    }
    return HostListenerMetadata;
}());
exports.HostListenerMetadata = HostListenerMetadata;
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