import { type OnChanges, type 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;
    protected readonly placeholder: import("@angular/core").Signal<string | null>;
    readonly tuiSkeleton: import("@angular/core").InputSignal<string | number | boolean>;
    ngOnChanges({ tuiSkeleton }: SimpleChanges): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<TuiSkeleton, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<TuiSkeleton, "[tuiSkeleton]", never, { "tuiSkeleton": { "alias": "tuiSkeleton"; "required": false; "isSignal": true; }; }, {}, never, never, true, never>;
}