angular-reactive-validation/lib/reactive-validation-module-configuration.d.ts

Reactive Forms validation shouldn't require the developer to write lots of HTML to show validation messages. This library makes it easy.

import { UntypedFormControl } from '@angular/forms';
export interface ReactiveValidationModuleConfiguration {
    /**
     * Function to override the default validation message display behaviour with a different implementation.
     * The default returns true when the control is touched, or the form has been submitted.
     *
     * @param control The control for which to display errors
     * @param formSubmitted whether the form is submitted or not. When undefined, it's not known
     * if the form is submitted, due to the form tag missing a formGroup.
     */
    displayValidationMessageWhen?: (control: UntypedFormControl, formSubmitted: boolean | undefined) => boolean;
}