application_tokens.ts
/**
* @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 {InjectionToken} from './di';
import {ComponentRef} from './linker/component_factory';
/**
* A [DI token](guide/glossary#di-token "DI token definition") representing a unique string ID, used
* primarily for prefixing application attributes and CSS styles when
* {@link ViewEncapsulation#Emulated ViewEncapsulation.Emulated} is being used.
*
* BY default, the value is randomly generated and assigned to the application by Angular.
* To provide a custom ID value, use a DI provider <!-- TODO: provider --> to configure
* the root {@link Injector} that uses this token.
*
* @publicApi
*/
export const APP_ID = new InjectionToken<string>('AppId');
export function _appIdRandomProviderFactory() {
return `${_randomChar()}${_randomChar()}${_randomChar()}`;
}
/**
* Providers that generate a random `APP_ID_TOKEN`.
* @publicApi
*/
export const APP_ID_RANDOM_PROVIDER = {
provide: APP_ID,
useFactory: _appIdRandomProviderFactory,
deps: <any[]>[],
};
function _randomChar(): string {
return String.fromCharCode(97 + Math.floor(Math.random() * 25));
}
/**
* A function that is executed when a platform is initialized.
* @publicApi
*/
export const PLATFORM_INITIALIZER = new InjectionToken<Array<() => void>>('Platform Initializer');
/**
* A token that indicates an opaque platform ID.
* @publicApi
*/
export const PLATFORM_ID = new InjectionToken<Object>('Platform ID');
/**
* A [DI token](guide/glossary#di-token "DI token definition") that provides a set of callbacks to
* be called for every component that is bootstrapped.
*
* Each callback must take a `ComponentRef` instance and return nothing.
*
* `(componentRef: ComponentRef) => void`
*
* @publicApi
*/
export const APP_BOOTSTRAP_LISTENER =
new InjectionToken<Array<(compRef: ComponentRef<any>) => void>>('appBootstrapListener');
/**
* A [DI token](guide/glossary#di-token "DI token definition") that indicates the root directory of
* the application
* @publicApi
*/
export const PACKAGE_ROOT_URL = new InjectionToken<string>('Application Packages Root URL');