80 lines
1.9 KiB
TypeScript
80 lines
1.9 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {getDebugContext, getErrorLogger, getOriginalError} from './errors';
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/**
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* Provides a hook for centralized exception handling.
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*
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* The default implementation of `ErrorHandler` prints error messages to the `console`. To
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* intercept error handling, write a custom exception handler that replaces this default as
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* appropriate for your app.
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*
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* @usageNotes
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* ### Example
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*
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* ```
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* class MyErrorHandler implements ErrorHandler {
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* handleError(error) {
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* // do something with the exception
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* }
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* }
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*
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* @NgModule({
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* providers: [{provide: ErrorHandler, useClass: MyErrorHandler}]
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* })
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* class MyModule {}
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* ```
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*
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* @publicApi
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*/
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export class ErrorHandler {
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/**
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* @internal
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*/
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_console: Console = console;
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handleError(error: any): void {
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const originalError = this._findOriginalError(error);
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const context = this._findContext(error);
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// Note: Browser consoles show the place from where console.error was called.
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// We can use this to give users additional information about the error.
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const errorLogger = getErrorLogger(error);
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errorLogger(this._console, `ERROR`, error);
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if (originalError) {
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errorLogger(this._console, `ORIGINAL ERROR`, originalError);
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}
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if (context) {
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errorLogger(this._console, 'ERROR CONTEXT', context);
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}
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}
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/** @internal */
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_findContext(error: any): any {
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if (error) {
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return getDebugContext(error) ? getDebugContext(error) :
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this._findContext(getOriginalError(error));
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}
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return null;
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}
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/** @internal */
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_findOriginalError(error: Error): any {
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let e = getOriginalError(error);
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while (e && getOriginalError(e)) {
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e = getOriginalError(e);
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}
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return e;
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}
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}
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