import type { OnChanges, SimpleChanges } from '@angular/core';
import * as i0 from "@angular/core";
export declare class TuiSkeleton implements OnChanges {
    private animation?;
    private readonly el;
    private readonly duration;
    protected readonly nothing: undefined;
    tuiSkeleton: boolean | number | string;
    ngOnChanges({ tuiSkeleton }: SimpleChanges): void;
    protected getPlaceholder(value: boolean | number | string): string | null;
    static ɵfac: i0.ɵɵFactoryDeclaration<TuiSkeleton, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<TuiSkeleton, "[tuiSkeleton]", never, { "tuiSkeleton": { "alias": "tuiSkeleton"; "required": false; }; }, {}, never, never, true, never>;
}