@angular/core
Version:
Angular - the core framework
71 lines • 6.47 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 { inject, InjectionToken } from './di';
import { getOriginalError } from './util/errors';
/**
* Provides a hook for centralized exception handling.
*
* The default implementation of `ErrorHandler` prints error messages to the `console`. To
* intercept error handling, write a custom exception handler that replaces this default as
* appropriate for your app.
*
* @usageNotes
* ### Example
*
* ```
* class MyErrorHandler implements ErrorHandler {
* handleError(error) {
* // do something with the exception
* }
* }
*
* @NgModule({
* providers: [{provide: ErrorHandler, useClass: MyErrorHandler}]
* })
* class MyModule {}
* ```
*
* @publicApi
*/
export class ErrorHandler {
constructor() {
/**
* @internal
*/
this._console = console;
}
handleError(error) {
const originalError = this._findOriginalError(error);
this._console.error('ERROR', error);
if (originalError) {
this._console.error('ORIGINAL ERROR', originalError);
}
}
/** @internal */
_findOriginalError(error) {
let e = error && getOriginalError(error);
while (e && getOriginalError(e)) {
e = getOriginalError(e);
}
return e || null;
}
}
/**
* `InjectionToken` used to configure how to call the `ErrorHandler`.
*
* `NgZone` is provided by default today so the default (and only) implementation for this
* is calling `ErrorHandler.handleError` outside of the Angular zone.
*/
export const INTERNAL_APPLICATION_ERROR_HANDLER = new InjectionToken(typeof ngDevMode === 'undefined' || ngDevMode ? 'internal error handler' : '', {
providedIn: 'root',
factory: () => {
const userErrorHandler = inject(ErrorHandler);
return userErrorHandler.handleError.bind(this);
},
});
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