im-angular-validators/lib/validators/required.validator.d.ts

This library will help you with lots of already written mostly used validators for Angular 2+ applications.

import { ValidatorFn } from '@angular/forms';
export declare class IMRequiredValidatorConfigModel {
    isTrimValueRequired?: boolean;
    isZeroAllowed?: boolean;
    isCheckboxShouldBeChecked?: boolean;
}
export declare const IMRequiredValidator: (config?: IMRequiredValidatorConfigModel) => ValidatorFn;