import { OnDestroy, OnInit } from '@angular/core';
import { NgControl } from '@angular/forms';
import { Observable, Subject } from 'rxjs';
import * as i0 from "@angular/core";
/**
 *
 * Usage:
 * If you want to trace value with control.
 * The difference between aclValueTrack and ngModelChange is that aclValueTrack carries the first value.
 * So it is not for changes, but for value traces
 * For compatibility and cover the deprecation of ngModelChange, we provide aclValueTrackSkipFirst option
 * eg:
 * <input formControlName="name" [aclValueTrack]="function()">
 *
 */
export declare class ControlValueTraceDirective implements OnInit, OnDestroy {
    private readonly ngControl;
    aclValueTrackSkipFirst: boolean;
    aclValueTrack: (value?: unknown) => void;
    aclValueTrack$: Observable<(value?: unknown) => void>;
    destroy$$: Subject<void>;
    ngOnDestroy(): void;
    ngOnInit(): void;
    constructor(ngControl: NgControl);
    static ɵfac: i0.ɵɵFactoryDeclaration<ControlValueTraceDirective, [{ host: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<ControlValueTraceDirective, "[aclValueTrack]", never, { "aclValueTrackSkipFirst": { "alias": "aclValueTrackSkipFirst"; "required": false; }; "aclValueTrack": { "alias": "aclValueTrack"; "required": false; }; }, {}, never, never, true, never>;
}