import { ChangeDetectorRef, ElementRef, EventEmitter, OnInit } from '@angular/core';
import { PositionService } from './position.service';
import * as i0 from "@angular/core";
export declare class FirstOnLineDirective implements OnInit {
    private elementRef;
    private positionService;
    private cdr;
    private previousValue?;
    onFirstLine: boolean;
    readonly airFirstOnLineChange: EventEmitter<boolean>;
    constructor(elementRef: ElementRef<HTMLElement>, positionService: PositionService, cdr: ChangeDetectorRef);
    ngOnInit(): void;
    check(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<FirstOnLineDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<FirstOnLineDirective, "[airFirstOnLine]", ["firstOnLine"], {}, { "airFirstOnLineChange": "airFirstOnLineChange"; }, never>;
}