import { FormGroupDirective, NgControl, NgForm } from '@angular/forms';
import { ErrorStateMatcher } from './error-state-matcher';
export declare type Constructor<T> = new (...args: any[]) => T;
export interface CanUpdateErrorState {
    updateErrorState(): void;
    errorState: boolean;
    errorStateMatcher?: ErrorStateMatcher;
}
export declare type CanUpdateErrorStateCtor = Constructor<CanUpdateErrorState>;
export interface HasErrorState {
    _parentFormGroup: FormGroupDirective;
    _parentForm: NgForm;
    _defaultErrorStateMatcher: ErrorStateMatcher;
    ngControl: NgControl;
}
/**
 * Mixin to augment a directive with updateErrorState method.
 * For component with `errorState` and need to update `errorState`.
 */
export declare function mixinErrorState<T extends Constructor<HasErrorState>>(base: T): CanUpdateErrorStateCtor & T;