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/**
* @license
* Copyright Google LLC 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
*/
import { getNullInjector } from '../di/r3_injector';
import { ComponentFactory } from './component_ref';
import { getComponentDef } from './definition';
import { assertComponentDef } from './errors';
/**
* Creates a `ComponentRef` instance based on provided component type and a set of options.
*
* @usageNotes
*
* The example below demonstrates how the `createComponent` function can be used
* to create an instance of a ComponentRef dynamically and attach it to an ApplicationRef,
* so that it gets included into change detection cycles.
*
* Note: the example uses standalone components, but the function can also be used for
* non-standalone components (declared in an NgModule) as well.
*
* ```typescript
* @Component({
* standalone: true,
* template: `Hello {{ name }}!`
* })
* class HelloComponent {
* name = 'Angular';
* }
*
* @Component({
* standalone: true,
* template: ``
* })
* class RootComponent {}
*
* // Bootstrap an application.
* const applicationRef = await bootstrapApplication(RootComponent);
*
* // Locate a DOM node that would be used as a host.
* const hostElement = document.getElementById('hello-component-host');
*
* // Get an `EnvironmentInjector` instance from the `ApplicationRef`.
* const environmentInjector = applicationRef.injector;
*
* // We can now create a `ComponentRef` instance.
* const componentRef = createComponent(HelloComponent, {hostElement, environmentInjector});
*
* // Last step is to register the newly created ref using the `ApplicationRef` instance
* // to include the component view into change detection cycles.
* applicationRef.attachView(componentRef.hostView);
* componentRef.changeDetectorRef.detectChanges();
* ```
*
* @param component Component class reference.
* @param options Set of options to use:
* * `environmentInjector`: An `EnvironmentInjector` instance to be used for the component.
* * `hostElement` (optional): A DOM node that should act as a host node for the component. If not
* provided, Angular creates one based on the tag name used in the component selector (and falls
* back to using `div` if selector doesn't have tag name info).
* * `elementInjector` (optional): An `ElementInjector` instance, see additional info about it
* [here](guide/di/hierarchical-dependency-injection#elementinjector).
* * `projectableNodes` (optional): A list of DOM nodes that should be projected through
* [``](api/core/ng-content) of the new component instance.
* @returns ComponentRef instance that represents a given Component.
*
* @publicApi
*/
export function createComponent(component, options) {
ngDevMode && assertComponentDef(component);
const componentDef = getComponentDef(component);
const elementInjector = options.elementInjector || getNullInjector();
const factory = new ComponentFactory(componentDef);
return factory.create(elementInjector, options.projectableNodes, options.hostElement, options.environmentInjector);
}
/**
* Creates an object that allows to retrieve component metadata.
*
* @usageNotes
*
* The example below demonstrates how to use the function and how the fields
* of the returned object map to the component metadata.
*
* ```typescript
* @Component({
* standalone: true,
* selector: 'foo-component',
* template: `
* ();
* }
*
* const mirror = reflectComponentType(FooComponent);
* expect(mirror.type).toBe(FooComponent);
* expect(mirror.selector).toBe('foo-component');
* expect(mirror.isStandalone).toBe(true);
* expect(mirror.inputs).toEqual([{propName: 'inputName', templateName: 'inputPropName'}]);
* expect(mirror.outputs).toEqual([{propName: 'outputName', templateName: 'outputPropName'}]);
* expect(mirror.ngContentSelectors).toEqual([
* '*', // first `` in a template, the selector defaults to `*`
* 'content-selector-a' // second `` in a template
* ]);
* ```
*
* @param component Component class reference.
* @returns An object that allows to retrieve component metadata.
*
* @publicApi
*/
export function reflectComponentType(component) {
const componentDef = getComponentDef(component);
if (!componentDef)
return null;
const factory = new ComponentFactory(componentDef);
return {
get selector() {
return factory.selector;
},
get type() {
return factory.componentType;
},
get inputs() {
return factory.inputs;
},
get outputs() {
return factory.outputs;
},
get ngContentSelectors() {
return factory.ngContentSelectors;
},
get isStandalone() {
return componentDef.standalone;
},
get isSignal() {
return componentDef.signals;
},
};
}
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If not\n * provided, Angular creates one based on the tag name used in the component selector (and falls\n * back to using `div` if selector doesn't have tag name info).\n *  * `elementInjector` (optional): An `ElementInjector` instance, see additional info about it\n * [here](guide/di/hierarchical-dependency-injection#elementinjector).\n *  * `projectableNodes` (optional): A list of DOM nodes that should be projected through\n *                      [`<ng-content>`](api/core/ng-content) of the new component instance.\n * @returns ComponentRef instance that represents a given Component.\n *\n * @publicApi\n */\nexport function createComponent<C>(\n  component: Type<C>,\n  options: {\n    environmentInjector: EnvironmentInjector;\n    hostElement?: Element;\n    elementInjector?: Injector;\n    projectableNodes?: Node[][];\n  },\n): ComponentRef<C> {\n  ngDevMode && assertComponentDef(component);\n  const componentDef = getComponentDef(component)!;\n  const elementInjector = options.elementInjector || getNullInjector();\n  const factory = new ComponentFactory<C>(componentDef);\n  return factory.create(\n    elementInjector,\n    options.projectableNodes,\n    options.hostElement,\n    options.environmentInjector,\n  );\n}\n\n/**\n * An interface that describes the subset of component metadata\n * that can be retrieved using the `reflectComponentType` function.\n *\n * @publicApi\n */\nexport interface ComponentMirror<C> {\n  /**\n   * The component's HTML selector.\n   */\n  get selector(): string;\n  /**\n   * The type of component the factory will create.\n   */\n  get type(): Type<C>;\n  /**\n   * The inputs of the component.\n   */\n  get inputs(): ReadonlyArray<{\n    readonly propName: string;\n    readonly templateName: string;\n    readonly transform?: (value: any) => any;\n    readonly isSignal: boolean;\n  }>;\n  /**\n   * The outputs of the component.\n   */\n  get outputs(): ReadonlyArray<{readonly propName: string; readonly templateName: string}>;\n  /**\n   * Selector for all <ng-content> elements in the component.\n   */\n  get ngContentSelectors(): ReadonlyArray<string>;\n  /**\n   * Whether this component is marked as standalone.\n   * Note: an extra flag, not present in `ComponentFactory`.\n   */\n  get isStandalone(): boolean;\n  /**\n   * // TODO(signals): Remove internal and add public documentation\n   * @internal\n   */\n  get isSignal(): boolean;\n}\n\n/**\n * Creates an object that allows to retrieve component metadata.\n *\n * @usageNotes\n *\n * The example below demonstrates how to use the function and how the fields\n * of the returned object map to the component metadata.\n *\n * ```typescript\n * @Component({\n *   standalone: true,\n *   selector: 'foo-component',\n *   template: `\n *     <ng-content></ng-content>\n *     <ng-content select=\"content-selector-a\"></ng-content>\n *   `,\n * })\n * class FooComponent {\n *   @Input('inputName') inputPropName: string;\n *   @Output('outputName') outputPropName = new EventEmitter<void>();\n * }\n *\n * const mirror = reflectComponentType(FooComponent);\n * expect(mirror.type).toBe(FooComponent);\n * expect(mirror.selector).toBe('foo-component');\n * expect(mirror.isStandalone).toBe(true);\n * expect(mirror.inputs).toEqual([{propName: 'inputName', templateName: 'inputPropName'}]);\n * expect(mirror.outputs).toEqual([{propName: 'outputName', templateName: 'outputPropName'}]);\n * expect(mirror.ngContentSelectors).toEqual([\n *   '*',                 // first `<ng-content>` in a template, the selector defaults to `*`\n *   'content-selector-a' // second `<ng-content>` in a template\n * ]);\n * ```\n *\n * @param component Component class reference.\n * @returns An object that allows to retrieve component metadata.\n *\n * @publicApi\n */\nexport function reflectComponentType<C>(component: Type<C>): ComponentMirror<C> | null {\n  const componentDef = getComponentDef(component);\n  if (!componentDef) return null;\n\n  const factory = new ComponentFactory<C>(componentDef);\n  return {\n    get selector(): string {\n      return factory.selector;\n    },\n    get type(): Type<C> {\n      return factory.componentType;\n    },\n    get inputs(): ReadonlyArray<{\n      propName: string;\n      templateName: string;\n      transform?: (value: any) => any;\n      isSignal: boolean;\n    }> {\n      return factory.inputs;\n    },\n    get outputs(): ReadonlyArray<{propName: string; templateName: string}> {\n      return factory.outputs;\n    },\n    get ngContentSelectors(): ReadonlyArray<string> {\n      return factory.ngContentSelectors;\n    },\n    get isStandalone(): boolean {\n      return componentDef.standalone;\n    },\n    get isSignal(): boolean {\n      return componentDef.signals;\n    },\n  };\n}\n"]}