errors.ts
/**
* @license
* Copyright Google Inc. 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 {ERROR_DEBUG_CONTEXT, ERROR_LOGGER, getDebugContext} from '../errors';
import {DebugContext, ViewState} from './types';
export function expressionChangedAfterItHasBeenCheckedError(
context: DebugContext, oldValue: any, currValue: any, isFirstCheck: boolean): Error {
let msg =
`ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: '${oldValue}'. Current value: '${currValue}'.`;
if (isFirstCheck) {
msg +=
` It seems like the view has been created after its parent and its children have been dirty checked.` +
` Has it been created in a change detection hook ?`;
}
return viewDebugError(msg, context);
}
export function viewWrappedDebugError(err: any, context: DebugContext): Error {
if (!(err instanceof Error)) {
// errors that are not Error instances don't have a stack,
// so it is ok to wrap them into a new Error object...
err = new Error(err.toString());
}
_addDebugContext(err, context);
return err;
}
export function viewDebugError(msg: string, context: DebugContext): Error {
const err = new Error(msg);
_addDebugContext(err, context);
return err;
}
function _addDebugContext(err: Error, context: DebugContext) {
(err as any)[ERROR_DEBUG_CONTEXT] = context;
(err as any)[ERROR_LOGGER] = context.logError.bind(context);
}
export function isViewDebugError(err: Error): boolean {
return !!getDebugContext(err);
}
export function viewDestroyedError(action: string): Error {
return new Error(`ViewDestroyedError: Attempt to use a destroyed view: ${action}`);
}