import { FormControl, FormGroupDirective, NgControl, NgForm } from '@angular/forms';
import { Subject } from 'rxjs';
import { Constructor } from './constructor';
/**
 * 提供程序, 用于定义窗体控件在显示错误消息方面的行为方式。
 */
export declare class ErrorStateMatcher {
    isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean;
}
/** 当控件无效且脏时匹配的错误状态 */
export declare class ShowOnDirtyErrorStateMatcher implements ErrorStateMatcher {
    isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean;
}
export interface CanUpdateErrorState {
    errorState: boolean;
    errorStateMatcher: ErrorStateMatcher;
    readonly stateChanges: Subject<void>;
    updateErrorState(): void;
}
export declare type CanUpdateErrorStateCtor = Constructor<CanUpdateErrorState>;
export interface HasErrorState {
    _defaultErrorStateMatcher: ErrorStateMatcher;
    _parentForm: NgForm;
    _parentFormGroup: FormGroupDirective;
    ngControl: NgControl;
}
/**
 * Mixin 用 updateErrorState 方法增加指令。 对于具有 errorState 的组件, 需要更新 errorState。
 */
export declare function mixinErrorState<T extends Constructor<HasErrorState>>(base: T): Constructor<CanUpdateErrorState> & T;