@angular/core
Version:
Angular - the core framework
63 lines • 8.25 kB
JavaScript
/**
* @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 { RuntimeError } from '../errors';
import { setInjectorProfilerContext } from '../render3/debug/injector_profiler';
import { getCurrentInjector, setCurrentInjector } from './injector_compatibility';
import { getInjectImplementation, setInjectImplementation } from './inject_switch';
import { R3Injector } from './r3_injector';
/**
* Runs the given function in the [context](guide/dependency-injection-context) of the given
* `Injector`.
*
* Within the function's stack frame, [`inject`](api/core/inject) can be used to inject dependencies
* from the given `Injector`. Note that `inject` is only usable synchronously, and cannot be used in
* any asynchronous callbacks or after any `await` points.
*
* @param injector the injector which will satisfy calls to [`inject`](api/core/inject) while `fn`
* is executing
* @param fn the closure to be run in the context of `injector`
* @returns the return value of the function, if any
* @publicApi
*/
export function runInInjectionContext(injector, fn) {
if (injector instanceof R3Injector) {
injector.assertNotDestroyed();
}
let prevInjectorProfilerContext;
if (ngDevMode) {
prevInjectorProfilerContext = setInjectorProfilerContext({ injector, token: null });
}
const prevInjector = setCurrentInjector(injector);
const previousInjectImplementation = setInjectImplementation(undefined);
try {
return fn();
}
finally {
setCurrentInjector(prevInjector);
ngDevMode && setInjectorProfilerContext(prevInjectorProfilerContext);
setInjectImplementation(previousInjectImplementation);
}
}
/**
* Asserts that the current stack frame is within an [injection
* context](guide/dependency-injection-context) and has access to `inject`.
*
* @param debugFn a reference to the function making the assertion (used for the error message).
*
* @publicApi
*/
export function assertInInjectionContext(debugFn) {
// Taking a `Function` instead of a string name here prevents the unminified name of the function
// from being retained in the bundle regardless of minification.
if (!getInjectImplementation() && !getCurrentInjector()) {
throw new RuntimeError(-203 /* RuntimeErrorCode.MISSING_INJECTION_CONTEXT */, ngDevMode &&
(debugFn.name +
'() can only be used within an injection context such as a constructor, a factory function, a field initializer, or a function used with `runInInjectionContext`'));
}
}
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