/**
 * @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 { throwProviderNotFoundError } from '../render3/errors_di';
import { assertNotEqual } from '../util/assert';
import { stringify } from '../util/stringify';
import { getInjectableDef } from './interface/defs';
import { InjectFlags } from './interface/injector';
/**
 * Current implementation of inject.
 *
 * By default, it is `injectInjectorOnly`, which makes it `Injector`-only aware. It can be changed
 * to `directiveInject`, which brings in the `NodeInjector` system of ivy. It is designed this
 * way for two reasons:
 *  1. `Injector` should not depend on ivy logic.
 *  2. To maintain tree shake-ability we don't want to bring in unnecessary code.
 */
let _injectImplementation;
export function getInjectImplementation() {
    return _injectImplementation;
}
/**
 * Sets the current inject implementation.
 */
export function setInjectImplementation(impl) {
    const previous = _injectImplementation;
    _injectImplementation = impl;
    return previous;
}
/**
 * Injects `root` tokens in limp mode.
 *
 * If no injector exists, we can still inject tree-shakable providers which have `providedIn` set to
 * `"root"`. This is known as the limp mode injection. In such case the value is stored in the
 * injectable definition.
 */
export function injectRootLimpMode(token, notFoundValue, flags) {
    const injectableDef = getInjectableDef(token);
    if (injectableDef && injectableDef.providedIn == 'root') {
        return injectableDef.value === undefined ? injectableDef.value = injectableDef.factory() :
            injectableDef.value;
    }
    if (flags & InjectFlags.Optional)
        return null;
    if (notFoundValue !== undefined)
        return notFoundValue;
    throwProviderNotFoundError(stringify(token), 'Injector');
}
/**
 * Assert that `_injectImplementation` is not `fn`.
 *
 * This is useful, to prevent infinite recursion.
 *
 * @param fn Function which it should not equal to
 */
export function assertInjectImplementationNotEqual(fn) {
    ngDevMode &&
        assertNotEqual(_injectImplementation, fn, 'Calling ɵɵinject would cause infinite recursion');
}
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