import { AbstractControl } from '@angular/forms';
/**
 * Whether the control a field is bound to requires a value, which is what
 * Material reflects onto the element as `required`/`aria-required` and draws
 * the asterisk on the label from.
 *
 * A field wrapping a value accessor has to report this itself: the control
 * Material can see is the internal one, which carries none of the validators
 * the parent control was declared with.
 */
export declare const isFieldRequired: (control: AbstractControl | null | undefined) => boolean;