import { Type } from './facade/type';
import { InjectionToken } from './injection_token';
export declare const THROW_IF_NOT_FOUND: Object;
/**
 * @whatItDoes Injector interface
 * @howToUse
 * ```
 * const injector: Injector = ...;
 * injector.get(...);
 * ```
 *
 * @description
 * For more details, see the {@linkDocs guide/dependency-injection "Dependency Injection Guide"}.
 *
 * ### Example
 *
 * {@example core/di/ts/injector_spec.ts region='Injector'}
 *
 * `Injector` returns itself when given `Injector` as a token:
 * {@example core/di/ts/injector_spec.ts region='injectInjector'}
 *
 * @stable
 */
export declare abstract class Injector {
    static THROW_IF_NOT_FOUND: Object;
    static NULL: Injector;
    /**
     * Retrieves an instance from the injector based on the provided token.
     * If not found:
     * - Throws {@link NoProviderError} if no `notFoundValue` that is not equal to
     * Injector.THROW_IF_NOT_FOUND is given
     * - Returns the `notFoundValue` otherwise
     */
    abstract get<T>(token: Type<T> | InjectionToken<T>, notFoundValue?: T): T;
    /**
     * @deprecated from v4.0.0 use Type<T> or InjectionToken<T>
     * @suppress {duplicate}
     */
    abstract get(token: any, notFoundValue?: any): any;
}