import { Constructor } from './constructor';
import { ErrorStateMatcher } from '../error/error-options';
import { FormGroupDirective, NgControl, NgForm } from '@angular/forms';
import { Subject } from 'rxjs/Subject';
export interface CanUpdateErrorState {
    updateErrorState(): any;
    readonly stateChanges: Subject<void>;
    errorState: boolean;
    errorStateMatcher: ErrorStateMatcher;
}
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): Constructor<CanUpdateErrorState> & T;