import { InjectionToken } from '@angular/core';
export interface RxVirtualScrollDefaultOptions {
    templateCacheSize?: number;
    runwayItems?: number;
    runwayItemsOpposite?: number;
    itemSize?: number;
}
/** Injection token to be used to override the default options. */
export declare const RX_VIRTUAL_SCROLL_DEFAULT_OPTIONS: InjectionToken<RxVirtualScrollDefaultOptions>;
/** @internal */
export declare function RX_VIRTUAL_SCROLL_DEFAULT_OPTIONS_FACTORY(): RxVirtualScrollDefaultOptions;
/** @internal */
export declare const DEFAULT_TEMPLATE_CACHE_SIZE = 20;
/** @internal */
export declare const DEFAULT_ITEM_SIZE = 50;
/** @internal */
export declare const DEFAULT_RUNWAY_ITEMS = 10;
/** @internal */
export declare const DEFAULT_RUNWAY_ITEMS_OPPOSITE = 2;