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Angular 2 - a web framework for modern web apps

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var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) { var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d; if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc); else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r; return c > 3 && r && Object.defineProperty(target, key, r), r; }; var __metadata = (this && this.__metadata) || function (k, v) { if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v); }; import { isPresent, CONST } from 'angular2/src/facade/lang'; import { InjectableMetadata } from 'angular2/src/core/di/metadata'; import { ChangeDetectionStrategy } from 'angular2/src/core/change_detection'; /** * 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. */ export let DirectiveMetadata = class DirectiveMetadata extends InjectableMetadata { constructor({ selector, inputs, outputs, properties, events, host, bindings, providers, exportAs, queries } = {}) { super(); 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; this._bindings = bindings; } /** * 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 inputs() { return isPresent(this._properties) && this._properties.length > 0 ? this._properties : this._inputs; } get properties() { return this.inputs; } /** * 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 outputs() { return isPresent(this._events) && this._events.length > 0 ? this._events : this._outputs; } get events() { return this.outputs; } /** * 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', * bindings: [ * Greeter * ] * }) * class HelloWorld { * greeter:Greeter; * * constructor(greeter:Greeter) { * this.greeter = greeter; * } * } * ``` */ get providers() { return isPresent(this._bindings) && this._bindings.length > 0 ? this._bindings : this._providers; } /** @deprecated */ get bindings() { return this.providers; } }; DirectiveMetadata = __decorate([ CONST(), __metadata('design:paramtypes', [Object]) ], 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'} */ export let ComponentMetadata = class ComponentMetadata extends DirectiveMetadata { constructor({ selector, inputs, outputs, properties, events, host, exportAs, moduleId, bindings, providers, viewBindings, viewProviders, changeDetection = ChangeDetectionStrategy.Default, queries, templateUrl, template, styleUrls, styles, directives, pipes, encapsulation } = {}) { super({ selector: selector, inputs: inputs, outputs: outputs, properties: properties, events: events, host: host, exportAs: exportAs, bindings: bindings, providers: providers, queries: queries }); this.changeDetection = changeDetection; this._viewProviders = viewProviders; this._viewBindings = viewBindings; this.templateUrl = templateUrl; this.template = template; this.styleUrls = styleUrls; this.styles = styles; this.directives = directives; this.pipes = pipes; this.encapsulation = encapsulation; this.moduleId = moduleId; } /** * 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 viewProviders() { return isPresent(this._viewBindings) && this._viewBindings.length > 0 ? this._viewBindings : this._viewProviders; } get viewBindings() { return this.viewProviders; } }; ComponentMetadata = __decorate([ CONST(), __metadata('design:paramtypes', [Object]) ], 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'} */ export let PipeMetadata = class PipeMetadata extends InjectableMetadata { constructor({ name, pure }) { super(); this.name = name; this._pure = pure; } get pure() { return isPresent(this._pure) ? this._pure : true; } }; PipeMetadata = __decorate([ CONST(), __metadata('design:paramtypes', [Object]) ], 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); * ``` */ export let InputMetadata = class InputMetadata { constructor( /** * Name used when instantiating a component in the template. */ bindingPropertyName) { this.bindingPropertyName = bindingPropertyName; } }; InputMetadata = __decorate([ CONST(), __metadata('design:paramtypes', [String]) ], 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); * ``` */ export let OutputMetadata = class OutputMetadata { constructor(bindingPropertyName) { this.bindingPropertyName = bindingPropertyName; } }; OutputMetadata = __decorate([ CONST(), __metadata('design:paramtypes', [String]) ], 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); * ``` */ export let HostBindingMetadata = class HostBindingMetadata { constructor(hostPropertyName) { this.hostPropertyName = hostPropertyName; } }; HostBindingMetadata = __decorate([ CONST(), __metadata('design:paramtypes', [String]) ], 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); * ``` */ export let HostListenerMetadata = class HostListenerMetadata { constructor(eventName, args) { this.eventName = eventName; this.args = args; } }; HostListenerMetadata = __decorate([ CONST(), __metadata('design:paramtypes', [String, Array]) ], HostListenerMetadata); //# 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{isPresent, CONST, CONST_EXPR, Type} from 'angular2/src/facade/lang';\nimport {InjectableMetadata} from 'angular2/src/core/di/metadata';\nimport {ChangeDetectionStrategy} from 'angular2/src/core/change_detection';\nimport {ViewEncapsulation} from 'angular2/src/core/metadata/view';\n\n/**\n * Directives allow you to attach behavior to elements in the DOM.\n *\n * {@link DirectiveMetadata}s with an embedded view are called {@link ComponentMetadata}s.\n *\n * A directive consists of a single directive annotation and a controller class. When the\n * directive's `selector` matches\n * elements in the DOM, the following steps occur:\n *\n * 1. For each directive, the `ElementInjector` attempts to resolve the directive's constructor\n * arguments.\n * 2. Angular instantiates directives for each matched element using `ElementInjector` in a\n * depth-first order,\n *    as declared in the HTML.\n *\n * ## Understanding How Injection Works\n *\n * There are three stages of injection resolution.\n * - *Pre-existing Injectors*:\n *   - The terminal {@link Injector} cannot resolve dependencies. It either throws an error or, if\n * the dependency was\n *     specified as `@Optional`, returns `null`.\n *   - The platform injector resolves browser singleton resources, such as: cookies, title,\n * location, and others.\n * - *Component Injectors*: Each component instance has its own {@link Injector}, and they follow\n * the same parent-child hierarchy\n *     as the component instances in the DOM.\n * - *Element Injectors*: Each component instance has a Shadow DOM. Within the Shadow DOM each\n * element has an `ElementInjector`\n *     which follow the same parent-child hierarchy as the DOM elements themselves.\n *\n * When a template is instantiated, it also must instantiate the corresponding directives in a\n * depth-first order. The\n * current `ElementInjector` resolves the constructor dependencies for each directive.\n *\n * Angular then resolves dependencies as follows, according to the order in which they appear in the\n * {@link ViewMetadata}:\n *\n * 1. Dependencies on the current element\n * 2. Dependencies on element injectors and their parents until it encounters a Shadow DOM boundary\n * 3. Dependencies on component injectors and their parents until it encounters the root component\n * 4. Dependencies on pre-existing injectors\n *\n *\n * The `ElementInjector` can inject other directives, element-specific special objects, or it can\n * delegate to the parent\n * injector.\n *\n * To inject other directives, declare the constructor parameter as:\n * - `directive:DirectiveType`: a directive on the current element only\n * - `@Host() directive:DirectiveType`: any directive that matches the type between the current\n * element and the\n *    Shadow DOM root.\n * - `@Query(DirectiveType) query:QueryList<DirectiveType>`: A live collection of direct child\n * directives.\n * - `@QueryDescendants(DirectiveType) query:QueryList<DirectiveType>`: A live collection of any\n * child directives.\n *\n * To inject element-specific special objects, declare the constructor parameter as:\n * - `element: ElementRef` to obtain a reference to logical element in the view.\n * - `viewContainer: ViewContainerRef` to control child template instantiation, for\n * {@link DirectiveMetadata} directives only\n * - `bindingPropagation: BindingPropagation` to control change detection in a more granular way.\n *\n * ### Example\n *\n * The following example demonstrates how dependency injection resolves constructor arguments in\n * practice.\n *\n *\n * Assume this HTML template:\n *\n * ```\n * <div dependency=\"1\">\n *   <div dependency=\"2\">\n *     <div dependency=\"3\" my-directive>\n *       <div dependency=\"4\">\n *         <div dependency=\"5\"></div>\n *       </div>\n *       <div dependency=\"6\"></div>\n *     </div>\n *   </div>\n * </div>\n * ```\n *\n * With the following `dependency` decorator and `SomeService` injectable class.\n *\n * ```\n * @Injectable()\n * class SomeService {\n * }\n *\n * @Directive({\n *   selector: '[dependency]',\n *   inputs: [\n *     'id: dependency'\n *   ]\n * })\n * class Dependency {\n *   id:string;\n * }\n * ```\n *\n * Let's step through the different ways in which `MyDirective` could be declared...\n *\n *\n * ### No injection\n *\n * Here the constructor is declared with no arguments, therefore nothing is injected into\n * `MyDirective`.\n *\n * ```\n * @Directive({ selector: '[my-directive]' })\n * class MyDirective {\n *   constructor() {\n *   }\n * }\n * ```\n *\n * This directive would be instantiated with no dependencies.\n *\n *\n * ### Component-level injection\n *\n * Directives can inject any injectable instance from the closest component injector or any of its\n * parents.\n *\n * Here, the constructor declares a parameter, `someService`, and injects the `SomeService` type\n * from the parent\n * component's injector.\n * ```\n * @Directive({ selector: '[my-directive]' })\n * class MyDirective {\n *   constructor(someService: SomeService) {\n *   }\n * }\n * ```\n *\n * This directive would be instantiated with a dependency on `SomeService`.\n *\n *\n * ### Injecting a directive from the current element\n *\n * Directives can inject other directives declared on the current element.\n *\n * ```\n * @Directive({ selector: '[my-directive]' })\n * class MyDirective {\n *   constructor(dependency: Dependency) {\n *     expect(dependency.id).toEqual(3);\n *   }\n * }\n * ```\n * This directive would be instantiated with `Dependency` declared at the same element, in this case\n * `dependency=\"3\"`.\n *\n * ### Injecting a directive from any ancestor elements\n *\n * Directives can inject other directives declared on any ancestor element (in the current Shadow\n * DOM), i.e. on the current element, the\n * parent element, or its parents.\n * ```\n * @Directive({ selector: '[my-directive]' })\n * class MyDirective {\n *   constructor(@Host() dependency: Dependency) {\n *     expect(dependency.id).toEqual(2);\n *   }\n * }\n * ```\n *\n * `@Host` checks the current element, the parent, as well as its parents recursively. If\n * `dependency=\"2\"` didn't\n * exist on the direct parent, this injection would\n * have returned\n * `dependency=\"1\"`.\n *\n *\n * ### Injecting a live collection of direct child directives\n *\n *\n * A directive can also query for other child directives. Since parent directives are instantiated\n * before child directives, a directive can't simply inject the list of child directives. Instead,\n * the directive injects a {@link QueryList}, which updates its contents as children are added,\n * removed, or moved by a directive that uses a {@link ViewContainerRef} such as a `ngFor`, an\n * `ngIf`, or an `ngSwitch`.\n *\n * ```\n * @Directive({ selector: '[my-directive]' })\n * class MyDirective {\n *   constructor(@Query(Dependency) dependencies:QueryList<Dependency>) {\n *   }\n * }\n * ```\n *\n * This directive would be instantiated with a {@link QueryList} which contains `Dependency` 4 and\n * `Dependency` 6. Here, `Dependency` 5 would not be included, because it is not a direct child.\n *\n * ### Injecting a live collection of descendant directives\n *\n * By passing the descendant flag to `@Query` above, we can include the children of the child\n * elements.\n *\n * ```\n * @Directive({ selector: '[my-directive]' })\n * class MyDirective {\n *   constructor(@Query(Dependency, {descendants: true}) dependencies:QueryList<Dependency>) {\n *   }\n * }\n * ```\n *\n * This directive would be instantiated with a Query which would contain `Dependency` 4, 5 and 6.\n *\n * ### Optional injection\n *\n * The normal behavior of directives is to return an error when a specified dependency cannot be\n * resolved. If you\n * would like to inject `null` on unresolved dependency instead, you can annotate that dependency\n * with `@Optional()`.\n * This explicitly permits the author of a template to treat some of the surrounding directives as\n * optional.\n *\n * ```\n * @Directive({ selector: '[my-directive]' })\n * class MyDirective {\n *   constructor(@Optional() dependency:Dependency) {\n *   }\n * }\n * ```\n *\n * This directive would be instantiated with a `Dependency` directive found on the current element.\n * If none can be\n * found, the injector supplies `null` instead of throwing an error.\n *\n * ### Example\n *\n * Here we use a decorator directive to simply define basic tool-tip behavior.\n *\n * ```\n * @Directive({\n *   selector: '[tooltip]',\n *   inputs: [\n *     'text: tooltip'\n *   ],\n *   host: {\n *     '(mouseenter)': 'onMouseEnter()',\n *     '(mouseleave)': 'onMouseLeave()'\n *   }\n * })\n * class Tooltip{\n *   text:string;\n *   overlay:Overlay; // NOT YET IMPLEMENTED\n *   overlayManager:OverlayManager; // NOT YET IMPLEMENTED\n *\n *   constructor(overlayManager:OverlayManager) {\n *     this.overlay = overlay;\n *   }\n *\n *   onMouseEnter() {\n *     // exact signature to be determined\n *     this.overlay = this.overlayManager.open(text, ...);\n *   }\n *\n *   onMouseLeave() {\n *     this.overlay.close();\n *     this.overlay = null;\n *   }\n * }\n * ```\n * In our HTML template, we can then add this behavior to a `<div>` or any other element with the\n * `tooltip` selector,\n * like so:\n *\n * ```\n * <div tooltip=\"some text here\"></div>\n * ```\n *\n * Directives can also control the instantiation, destruction, and positioning of inline template\n * elements:\n *\n * A directive uses a {@link ViewContainerRef} to instantiate, insert, move, and destroy views at\n * runtime.\n * The {@link ViewContainerRef} is created as a result of `<template>` element, and represents a\n * location in the current view\n * where these actions are performed.\n *\n * Views are always created as children of the current {@link ViewMetadata}, and as siblings of the\n * `<template>` element. Thus a\n * directive in a child view cannot inject the directive that created it.\n *\n * Since directives that create views via ViewContainers are common in Angular, and using the full\n * `<template>` element syntax is wordy, Angular\n * also supports a shorthand notation: `<li *foo=\"bar\">` and `<li template=\"foo: bar\">` are\n * equivalent.\n *\n * Thus,\n *\n * ```\n * <ul>\n *   <li *foo=\"bar\" title=\"text\"></li>\n * </ul>\n * ```\n *\n * Expands in use to:\n *\n * ```\n * <ul>\n *   <template [foo]=\"bar\">\n *     <li title=\"text\"></li>\n *   </template>\n * </ul>\n * ```\n *\n * Notice that although the shorthand places `*foo=\"bar\"` within the `<li>` element, the binding for\n * the directive\n * controller is correctly instantiated on the `<template>` element rather than the `<li>` element.\n *\n * ## Lifecycle hooks\n *\n * When the directive class implements some {@link ../../guide/lifecycle-hooks.html} the callbacks\n * are called by the change detection at defined points in time during the life of the directive.\n *\n * ### Example\n *\n * Let's suppose we want to implement the `unless` behavior, to conditionally include a template.\n *\n * Here is a simple directive that triggers on an `unless` selector:\n *\n * ```\n * @Directive({\n *   selector: '[unless]',\n *   inputs: ['unless']\n * })\n * export class Unless {\n *   viewContainer: ViewContainerRef;\n *   templateRef: TemplateRef;\n *   prevCondition: boolean;\n *\n *   constructor(viewContainer: ViewContainerRef, templateRef: TemplateRef) {\n *     this.viewContainer = viewContainer;\n *     this.templateRef = templateRef;\n *     this.prevCondition = null;\n *   }\n *\n *   set unless(newCondition) {\n *     if (newCondition && (isBlank(this.prevCondition) || !this.prevCondition)) {\n *       this.prevCondition = true;\n *       this.viewContainer.clear();\n *     } else if (!newCondition && (isBlank(this.prevCondition) || this.prevCondition)) {\n *       this.prevCondition = false;\n *       this.viewContainer.create(this.templateRef);\n *     }\n *   }\n * }\n * ```\n *\n * We can then use this `unless` selector in a template:\n * ```\n * <ul>\n *   <li *unless=\"expr\"></li>\n * </ul>\n * ```\n *\n * Once the directive instantiates the child view, the shorthand notation for the template expands\n * and the result is:\n *\n * ```\n * <ul>\n *   <template [unless]=\"exp\">\n *     <li></li>\n *   </template>\n 