/**
 * @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 { createInjector } from './create_injector';
import { THROW_IF_NOT_FOUND, ɵɵinject } from './injector_compatibility';
import { INJECTOR } from './injector_token';
import { ɵɵdefineInjectable } from './interface/defs';
import { NullInjector } from './null_injector';
/**
 * Concrete injectors implement this interface. Injectors are configured
 * with [providers](guide/glossary#provider) that associate
 * dependencies of various types with [injection tokens](guide/glossary#di-token).
 *
 * @see ["DI Providers"](guide/dependency-injection-providers).
 * @see {@link StaticProvider}
 *
 * @usageNotes
 *
 *  The following example creates a service injector instance.
 *
 * {@example core/di/ts/provider_spec.ts region='ConstructorProvider'}
 *
 * ### Usage 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'}
 *
 * @publicApi
 */
export class Injector {
    static { this.THROW_IF_NOT_FOUND = THROW_IF_NOT_FOUND; }
    static { this.NULL = ( /* @__PURE__ */new NullInjector()); }
    static create(options, parent) {
        if (Array.isArray(options)) {
            return createInjector({ name: '' }, parent, options, '');
        }
        else {
            const name = options.name ?? '';
            return createInjector({ name }, options.parent, options.providers, name);
        }
    }
    /** @nocollapse */
    static { this.ɵprov = ɵɵdefineInjectable({
        token: Injector,
        providedIn: 'any',
        factory: () => ɵɵinject(INJECTOR),
    }); }
    /**
     * @internal
     * @nocollapse
     */
    static { this.__NG_ELEMENT_ID__ = -1 /* InjectorMarkers.Injector */; }
}
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Injectors are configured\n * with [providers](guide/glossary#provider) that associate\n * dependencies of various types with [injection tokens](guide/glossary#di-token).\n *\n * @see [\"DI Providers\"](guide/dependency-injection-providers).\n * @see {@link StaticProvider}\n *\n * @usageNotes\n *\n *  The following example creates a service injector instance.\n *\n * {@example core/di/ts/provider_spec.ts region='ConstructorProvider'}\n *\n * ### Usage example\n *\n * {@example core/di/ts/injector_spec.ts region='Injector'}\n *\n * `Injector` returns itself when given `Injector` as a token:\n *\n * {@example core/di/ts/injector_spec.ts region='injectInjector'}\n *\n * @publicApi\n */\nexport abstract class Injector {\n  static THROW_IF_NOT_FOUND = THROW_IF_NOT_FOUND;\n  static NULL: Injector = (/* @__PURE__ */ new NullInjector());\n\n  /**\n   * Internal note on the `options?: InjectOptions|InjectFlags` override of the `get`\n   * method: consider dropping the `InjectFlags` part in one of the major versions.\n   * It can **not** be done in minor/patch, since it's breaking for custom injectors\n   * that only implement the old `InjectorFlags` interface.\n   */\n\n  /**\n   * Retrieves an instance from the injector based on the provided token.\n   * @returns The instance from the injector if defined, otherwise the `notFoundValue`.\n   * @throws When the `notFoundValue` is `undefined` or `Injector.THROW_IF_NOT_FOUND`.\n   */\n  abstract get<T>(token: ProviderToken<T>, notFoundValue: undefined, options: InjectOptions&{\n    optional?: false;\n  }): T;\n  /**\n   * Retrieves an instance from the injector based on the provided token.\n   * @returns The instance from the injector if defined, otherwise the `notFoundValue`.\n   * @throws When the `notFoundValue` is `undefined` or `Injector.THROW_IF_NOT_FOUND`.\n   */\n  abstract get<T>(token: ProviderToken<T>, notFoundValue: null|undefined, options: InjectOptions): T\n      |null;\n  /**\n   * Retrieves an instance from the injector based on the provided token.\n   * @returns The instance from the injector if defined, otherwise the `notFoundValue`.\n   * @throws When the `notFoundValue` is `undefined` or `Injector.THROW_IF_NOT_FOUND`.\n   */\n  abstract get<T>(token: ProviderToken<T>, notFoundValue?: T, options?: InjectOptions|InjectFlags):\n      T;\n  /**\n   * Retrieves an instance from the injector based on the provided token.\n   * @returns The instance from the injector if defined, otherwise the `notFoundValue`.\n   * @throws When the `notFoundValue` is `undefined` or `Injector.THROW_IF_NOT_FOUND`.\n   * @deprecated use object-based flags (`InjectOptions`) instead.\n   */\n  abstract get<T>(token: ProviderToken<T>, notFoundValue?: T, flags?: InjectFlags): T;\n  /**\n   * @deprecated from v4.0.0 use ProviderToken<T>\n   * @suppress {duplicate}\n   */\n  abstract get(token: any, notFoundValue?: any): any;\n\n  /**\n   * @deprecated from v5 use the new signature Injector.create(options)\n   */\n  static create(providers: StaticProvider[], parent?: Injector): Injector;\n\n  /**\n   * Creates a new injector instance that provides one or more dependencies,\n   * according to a given type or types of `StaticProvider`.\n   *\n   * @param options An object with the following properties:\n   * * `providers`: An array of providers of the [StaticProvider type](api/core/StaticProvider).\n   * * `parent`: (optional) A parent injector.\n   * * `name`: (optional) A developer-defined identifying name for the new injector.\n   *\n   * @returns The new injector instance.\n   *\n   */\n  static create(options:\n                    {providers: Array<Provider|StaticProvider>, parent?: Injector, name?: string}):\n      Injector;\n\n\n  static create(\n      options: StaticProvider[]|\n      {providers: Array<Provider|StaticProvider>, parent?: Injector, name?: string},\n      parent?: Injector): Injector {\n    if (Array.isArray(options)) {\n      return createInjector({name: ''}, parent, options, '');\n    } else {\n      const name = options.name ?? '';\n      return createInjector({name}, options.parent, options.providers, name);\n    }\n  }\n\n  /** @nocollapse */\n  static ɵprov = /** @pureOrBreakMyCode */ ɵɵdefineInjectable({\n    token: Injector,\n    providedIn: 'any',\n    factory: () => ɵɵinject(INJECTOR),\n  });\n\n  /**\n   * @internal\n   * @nocollapse\n   */\n  static __NG_ELEMENT_ID__ = InjectorMarkers.Injector;\n}\n"]}