import { AfterViewInit, ElementRef } from '@angular/core';
import * as i0 from "@angular/core";
export declare class ContrastDirective implements AfterViewInit {
    private _elementRef;
    color: string;
    constructor(_elementRef: ElementRef);
    ngAfterViewInit(): void;
    getInheritedBackgroundColor(el: Element): string;
    private _traverseParentBackgroundColor;
    private _contrastColorKey;
    static ɵfac: i0.ɵɵFactoryDeclaration<ContrastDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<ContrastDirective, "[axContrast]", never, { "color": { "alias": "axContrast"; "required": false; }; }, {}, never, never, false, never>;
}
