matchers nickname.matcher.ts

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  import { FormControl, FormGroupDirective, NgForm } from '@angular/forms';
import { ErrorStateMatcher } from '@angular/material/core';

/** Error when invalid control is dirty, touched, or submitted. */
export class NicknameMatcher implements ErrorStateMatcher {
	isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
		const isSubmitted = form && form.submitted;
		return !!(control && control.invalid && (control.dirty || control.touched || isSubmitted));
	}
}