node_modules/@angular/material/esm2015/form-field/error.js

/**
 * @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 { Directive, InjectionToken, Input } from '@angular/core';
let nextUniqueId = 0;
/**
 * Injection token that can be used to reference instances of `MatError`. It serves as
 * alternative token to the actual `MatError` class which could cause unnecessary
 * retention of the class and its directive metadata.
 */
export const MAT_ERROR = new InjectionToken('MatError');
/** Single error message to be shown underneath the form field. */
export class MatError {
    constructor() {
        this.id = `mat-error-${nextUniqueId++}`;
    }
}
MatError.decorators = [
    { type: Directive, args: [{
                selector: 'mat-error',
                host: {
                    'class': 'mat-error',
                    'role': 'alert',
                    '[attr.id]': 'id',
                },
                providers: [{ provide: MAT_ERROR, useExisting: MatError }],
            },] }
];
MatError.propDecorators = {
    id: [{ type: Input }]
};
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