import { Injector, OnChanges, OnDestroy, SimpleChanges } from '@angular/core';
import { FrameContext, ViewRuleRegistry } from '@farris/devkit';
export declare class FarrisDynamicRequiredDirective implements OnChanges, OnDestroy {
    protected frameContext: FrameContext;
    private injector;
    private viewRuleRegistry;
    /**
     * like {field:'',type:'require'}
     */
    field: string;
    /**
     * 启用校验的时机
     */
    requiredOn: boolean;
    constructor(frameContext: FrameContext, injector: Injector, viewRuleRegistry: ViewRuleRegistry);
    ngOnDestroy(): void;
    ngOnChanges(changes: SimpleChanges): void;
    /**
     *
     * @param isRequired
     */
    private updateValidateRule;
}